Cisco CCNA 200-301 Single-Area OSPFv2 Practice Test

Topic 23 focuses on Single-Area OSPFv2 for the Cisco Certified Network Associate (CCNA) certification and the 200-301 exam, using Cisco networking and Cisco IOS concepts where relevant. For broader exam preparation, review the Cisco CCNA 200-301 Exam Dumps page. Each question includes a concise explanation of the correct answer and the technical reason the other choices are incorrect.

Question 1

Which logical OSPF relationship is formed between compatible routers so they can exchange routing information?

1. 2-Way OSPF neighbor state
2. 224.0.0.5
3. Full OSPF neighbor state
4. OSPF neighbor adjacency

Correct Answer: D

 

Correct Answer

Answer D is correct because the selected answer describes a logical OSPF relationship formed between compatible routers so they can exchange routing information.

Incorrect Answers

Answer A is incorrect because the “2-Way OSPF neighbor state” option describes a different concept: the OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.

Answer B is incorrect because the “224.0.0.5” option describes a different concept: OSPF uses the IPv4 multicast address 224.0.0.5, AllSPFRouters, for messages intended for all OSPF routers on the local link.

Answer C is incorrect because the “Full OSPF neighbor state” option describes a different concept: the OSPF Full state indicates that neighboring routers have completed database synchronization for that adjacency.

 

Question 2

Which 32-bit dotted-decimal identifier uniquely identifies an OSPF router within the routing domain?

1. OSPF neighbor adjacency
2. DROTHER
3. Router ID
4. OSPF interface priority

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes a 32-bit dotted-decimal identifier that uniquely identifies an OSPF router within the routing domain.

Incorrect Answers

Answer A is incorrect because the “OSPF neighbor adjacency” option describes a different concept: a logical OSPF relationship formed between compatible routers so they can exchange routing information.

Answer B is incorrect because the “DROTHER” option describes a different concept: an OSPF router on a multiaccess segment that is neither the DR nor the BDR.

Answer D is incorrect because the “OSPF interface priority” option describes a different concept: On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.

 

Question 3

Which OSPF packet is used to discover neighbors and maintain neighbor relationships?

1. Hello packet
2. OSPF cost
3. Area 0
4. 2-Way OSPF neighbor state

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes an OSPF packet used to discover neighbors and maintain neighbor relationships.

Incorrect Answers

Answer B is incorrect because the “OSPF cost” option describes a different concept: the OSPF metric associated with an interface and used to calculate the lowest-cost path.

Answer C is incorrect because the “Area 0” option describes a different concept: the OSPF backbone area; a single-area OSPF deployment commonly places all participating interfaces in this area.

Answer D is incorrect because the “2-Way OSPF neighbor state” option describes a different concept: the OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.

 

Question 4

What is the period an OSPF router waits without receiving expected Hellos before declaring a neighbor down?

1. Dead interval
2. OSPF priority 0
3. OSPF neighbor adjacency
4. Full OSPF neighbor state

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes the period an OSPF router waits without receiving expected Hellos before declaring a neighbor down.

Incorrect Answers

Answer B is incorrect because the “OSPF priority 0” option describes a different concept: an OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.

Answer C is incorrect because the “OSPF neighbor adjacency” option describes a different concept: a logical OSPF relationship formed between compatible routers so they can exchange routing information.

Answer D is incorrect because the “Full OSPF neighbor state” option describes a different concept: the OSPF Full state indicates that neighboring routers have completed database synchronization for that adjacency.

 

Question 5

What is the OSPF backbone area; a single-area OSPF deployment commonly places all participating interfaces in this area?

224. 224.0.0.5
225. Area 0
226. Hello packet
227. OSPF reference bandwidth

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes the OSPF backbone area; a single-area OSPF deployment commonly places all participating interfaces in this area.

Incorrect Answers

Answer A is incorrect because the “224.0.0.5” option describes a different concept: OSPF uses the IPv4 multicast address 224.0.0.5, AllSPFRouters, for messages intended for all OSPF routers on the local link.

Answer C is incorrect because the “Hello packet” option describes a different concept: an OSPF packet used to discover neighbors and maintain neighbor relationships.

Answer D is incorrect because the “OSPF reference bandwidth” option describes a different concept: OSPF interface cost is derived from reference bandwidth divided by interface bandwidth unless the cost is manually configured.

 

Question 6

What is the designated router elected on a multiaccess OSPF network to reduce the number of adjacencies and LSA exchanges?

1. Broadcast OSPF network
2. DR
3. DROTHER
4. OSPF priority 0

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes the designated router elected on a multiaccess OSPF network to reduce the number of adjacencies and LSA exchanges.

Incorrect Answers

Answer A is incorrect because the “Broadcast OSPF network” option describes a different concept: On an OSPF broadcast multiaccess network such as Ethernet, routers elect a DR and BDR to reduce adjacency and LSA-exchange overhead.

Answer C is incorrect because the “DROTHER” option describes a different concept: an OSPF router on a multiaccess segment that is neither the DR nor the BDR.

Answer D is incorrect because the “OSPF priority 0” option describes a different concept: an OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.

 

Question 7

What is the backup designated router elected to take over the DR role if the DR fails?

1. OSPF interface priority
2. BDR
3. 224.0.0.6
4. Dead interval

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes the backup designated router elected to take over the DR role if the DR fails.

Incorrect Answers

Answer A is incorrect because the “OSPF interface priority” option describes a different concept: On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.

Answer C is incorrect because the “224.0.0.6” option describes a different concept: OSPF uses the IPv4 multicast address 224.0.0.6, AllDRouters, for messages intended for the DR and BDR on a broadcast network.

Answer D is incorrect because the “Dead interval” option describes a different concept: the period an OSPF router waits without receiving expected Hellos before declaring a neighbor down.

 

Question 8

Which OSPF router on a multiaccess segment is neither the DR nor the BDR?

1. Broadcast OSPF network
2. OSPF interface priority
3. DR
4. DROTHER

Correct Answer: D

 

Correct Answer

Answer D is correct because the selected answer describes an OSPF router on a multiaccess segment that is neither the DR nor the BDR.

Incorrect Answers

Answer A is incorrect because the “Broadcast OSPF network” option describes a different concept: On an OSPF broadcast multiaccess network such as Ethernet, routers elect a DR and BDR to reduce adjacency and LSA-exchange overhead.

Answer B is incorrect because the “OSPF interface priority” option describes a different concept: On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.

Answer C is incorrect because the “DR” option describes a different concept: the designated router elected on a multiaccess OSPF network to reduce the number of adjacencies and LSA exchanges.

 

Question 9

Which OSPF metric is associated with an interface and used to calculate the lowest-cost path?

1. DR
2. OSPF interface priority
3. Passive OSPF interface
4. OSPF cost

Correct Answer: D

 

Correct Answer

Answer D is correct because the selected answer describes the OSPF metric associated with an interface and used to calculate the lowest-cost path.

Incorrect Answers

Answer A is incorrect because the “DR” option describes a different concept: the designated router elected on a multiaccess OSPF network to reduce the number of adjacencies and LSA exchanges.

Answer B is incorrect because the “OSPF interface priority” option describes a different concept: On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.

Answer C is incorrect because the “Passive OSPF interface” option describes a different concept: an OSPF passive interface can advertise its connected network while suppressing OSPF Hellos and neighbor formation on that interface.

 

Question 10

What is an OSPF network type between two routers where DR and BDR elections are not required?

1. OSPF process ID
2. Point-to-point OSPF network
3. OSPF priority 0
4. 2-Way OSPF neighbor state

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes an OSPF network type between two routers where DR and BDR elections are not required.

Incorrect Answers

Answer A is incorrect because the “OSPF process ID” option describes a different concept: the Cisco IOS OSPF process ID identifies a local OSPF process and does not need to match between neighboring routers.

Answer C is incorrect because the “OSPF priority 0” option describes a different concept: an OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.

Answer D is incorrect because the “2-Way OSPF neighbor state” option describes a different concept: the OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.

 

Question 11

Which term describes on an OSPF broadcast multiaccess network such as Ethernet, routers elect a DR and BDR to reduce adjacency and LSA-exchange overhead?

1. 2-Way OSPF neighbor state
2. 224.0.0.6
3. DROTHER
4. Broadcast OSPF network

Correct Answer: D

 

Correct Answer

Answer D is correct because On an OSPF broadcast multiaccess network such as Ethernet, routers elect a DR and BDR to reduce adjacency and LSA-exchange overhead.

Incorrect Answers

Answer A is incorrect because the “2-Way OSPF neighbor state” option describes a different concept: the OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.

Answer B is incorrect because the “224.0.0.6” option describes a different concept: OSPF uses the IPv4 multicast address 224.0.0.6, AllDRouters, for messages intended for the DR and BDR on a broadcast network.

Answer C is incorrect because the “DROTHER” option describes a different concept: an OSPF router on a multiaccess segment that is neither the DR nor the BDR.

 

Question 12

On an OSPF broadcast network, which configured value is compared before router ID during DR and BDR election?

1. OSPF interface priority
2. DROTHER
3. OSPF reference bandwidth
4. Dead interval

Correct Answer: A

 

Correct Answer

Answer A is correct because On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.

Incorrect Answers

Answer B is incorrect because the “DROTHER” option describes a different concept: an OSPF router on a multiaccess segment that is neither the DR nor the BDR.

Answer C is incorrect because the “OSPF reference bandwidth” option describes a different concept: OSPF interface cost is derived from reference bandwidth divided by interface bandwidth unless the cost is manually configured.

Answer D is incorrect because the “Dead interval” option describes a different concept: the period an OSPF router waits without receiving expected Hellos before declaring a neighbor down.

 

Question 13

Which OSPF interface priority of 0 makes router ineligible to become the DR or BDR on the segment?

1. OSPF reference bandwidth
2. BDR
3. OSPF priority 0
4. OSPF cost

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes an OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.

Incorrect Answers

Answer A is incorrect because the “OSPF reference bandwidth” option describes a different concept: OSPF interface cost is derived from reference bandwidth divided by interface bandwidth unless the cost is manually configured.

Answer B is incorrect because the “BDR” option describes a different concept: the backup designated router elected to take over the DR role if the DR fails.

Answer D is incorrect because the “OSPF cost” option describes a different concept: the OSPF metric associated with an interface and used to calculate the lowest-cost path.

 

Question 14

An OSPF message is addressed to the AllSPFRouters group on the local link. Which IPv4 multicast destination represents this group?

224. 224.0.0.5
225. Full OSPF neighbor state
226. 2-Way OSPF neighbor state
227. OSPF process ID

Correct Answer: A

 

Correct Answer

Answer A is correct because OSPF uses the IPv4 multicast address 224.0.0.5, AllSPFRouters, for messages intended for all OSPF routers on the local link.

Incorrect Answers

Answer B is incorrect because the “Full OSPF neighbor state” option describes a different concept: the OSPF Full state indicates that neighboring routers have completed database synchronization for that adjacency.

Answer C is incorrect because the “2-Way OSPF neighbor state” option describes a different concept: the OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.

Answer D is incorrect because the “OSPF process ID” option describes a different concept: the Cisco IOS OSPF process ID identifies a local OSPF process and does not need to match between neighboring routers.

 

Question 15

An OSPF router sends a message to the AllDRouters group on a broadcast segment. Which IPv4 multicast address is the destination?

1. OSPF interface priority
2. 224.0.0.6
3. DR
4. OSPF priority 0

Correct Answer: B

 

Correct Answer

Answer B is correct because OSPF uses the IPv4 multicast address 224.0.0.6, AllDRouters, for messages intended for the DR and BDR on a broadcast network.

Incorrect Answers

Answer A is incorrect because the “OSPF interface priority” option describes a different concept: On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.

Answer C is incorrect because the “DR” option describes a different concept: the designated router elected on a multiaccess OSPF network to reduce the number of adjacencies and LSA exchanges.

Answer D is incorrect because the “OSPF priority 0” option describes a different concept: an OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.

 

Question 16

Which OSPF Full state indicates neighboring routers have completed database synchronization for that adjacency?

1. Hello packet
2. Point-to-point OSPF network
3. 2-Way OSPF neighbor state
4. Full OSPF neighbor state

Correct Answer: D

 

Correct Answer

Answer D is correct because the selected answer describes the OSPF Full state indicates that neighboring routers have completed database synchronization for that adjacency.

Incorrect Answers

Answer A is incorrect because the “Hello packet” option describes a different concept: an OSPF packet used to discover neighbors and maintain neighbor relationships.

Answer B is incorrect because the “Point-to-point OSPF network” option describes a different concept: an OSPF network type between two routers where DR and BDR elections are not required.

Answer C is incorrect because the “2-Way OSPF neighbor state” option describes a different concept: the OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.

 

Question 17

What is the OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment?

1. Point-to-point OSPF network
2. 2-Way OSPF neighbor state
3. Hello packet
4. OSPF process ID

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes the OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.

Incorrect Answers

Answer A is incorrect because the “Point-to-point OSPF network” option describes a different concept: an OSPF network type between two routers where DR and BDR elections are not required.

Answer C is incorrect because the “Hello packet” option describes a different concept: an OSPF packet used to discover neighbors and maintain neighbor relationships.

Answer D is incorrect because the “OSPF process ID” option describes a different concept: the Cisco IOS OSPF process ID identifies a local OSPF process and does not need to match between neighboring routers.

 

Question 18

Which IOS value identifies a local OSPF process and does not have to match the corresponding value on a neighboring router?

224. 224.0.0.5
225. Point-to-point OSPF network
226. OSPF process ID
227. Router ID

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes the Cisco IOS OSPF process ID identifies a local OSPF process and does not need to match between neighboring routers.

Incorrect Answers

Answer A is incorrect because the “224.0.0.5” option describes a different concept: OSPF uses the IPv4 multicast address 224.0.0.5, AllSPFRouters, for messages intended for all OSPF routers on the local link.

Answer B is incorrect because the “Point-to-point OSPF network” option describes a different concept: an OSPF network type between two routers where DR and BDR elections are not required.

Answer D is incorrect because the “Router ID” option describes a different concept: a 32-bit dotted-decimal identifier that uniquely identifies an OSPF router within the routing domain.

 

Question 19

Which OSPF parameter supplies the numerator in the automatic interface-cost calculation?

1. OSPF interface priority
2. 224.0.0.5
3. OSPF reference bandwidth
4. OSPF process ID

Correct Answer: C

 

Correct Answer

Answer C is correct because OSPF interface cost is derived from reference bandwidth divided by interface bandwidth unless the cost is manually configured.

Incorrect Answers

Answer A is incorrect because the “OSPF interface priority” option describes a different concept: On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.

Answer B is incorrect because the “224.0.0.5” option describes a different concept: OSPF uses the IPv4 multicast address 224.0.0.5, AllSPFRouters, for messages intended for all OSPF routers on the local link.

Answer D is incorrect because the “OSPF process ID” option describes a different concept: the Cisco IOS OSPF process ID identifies a local OSPF process and does not need to match between neighboring routers.

 

Question 20

Which OSPF passive interface can advertise its connected network while suppressing OSPF Hellos and neighbor formation on interface?

1. OSPF cost
2. Hello packet
3. Passive OSPF interface
4. Full OSPF neighbor state

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes an OSPF passive interface can advertise its connected network while suppressing OSPF Hellos and neighbor formation on that interface.

Incorrect Answers

Answer A is incorrect because the “OSPF cost” option describes a different concept: the OSPF metric associated with an interface and used to calculate the lowest-cost path.

Answer B is incorrect because the “Hello packet” option describes a different concept: an OSPF packet used to discover neighbors and maintain neighbor relationships.

Answer D is incorrect because the “Full OSPF neighbor state” option describes a different concept: the OSPF Full state indicates that neighboring routers have completed database synchronization for that adjacency.

 

Question 21

For OSPF neighbor adjacency, which statement is accurate?

1. A logical OSPF relationship formed between compatible routers so they can exchange routing information.
2. The OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.
3. OSPF uses the IPv4 multicast address 224.0.0.5, AllSPFRouters, for messages intended for all OSPF routers on the local link.
4. A 32-bit dotted-decimal identifier that uniquely identifies an OSPF router within the routing domain.

Correct Answer: A

 

Correct Answer

Answer A is correct because it accurately defines OSPF neighbor adjacency. The matching definition is: A logical OSPF relationship formed between compatible routers so they can exchange routing information.

Incorrect Answers

Answer B is incorrect because the “2-Way OSPF neighbor state” option describes a different concept: the OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.

Answer C is incorrect because the “224.0.0.5” option describes a different concept: OSPF uses the IPv4 multicast address 224.0.0.5, AllSPFRouters, for messages intended for all OSPF routers on the local link.

Answer D is incorrect because the “Router ID” option describes a different concept: a 32-bit dotted-decimal identifier that uniquely identifies an OSPF router within the routing domain.

 

Question 22

For Router ID, which statement is accurate?

1. A 32-bit dotted-decimal identifier that uniquely identifies an OSPF router within the routing domain.
2. An OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.
3. An OSPF router on a multiaccess segment that is neither the DR nor the BDR.
4. The designated router elected on a multiaccess OSPF network to reduce the number of adjacencies and LSA exchanges.

Correct Answer: A

 

Correct Answer

Answer A is correct because the choice accurately describes Router ID: A 32-bit dotted-decimal identifier that uniquely identifies an OSPF router within the routing domain.

Incorrect Answers

Answer B is incorrect because the “OSPF priority 0” option describes a different concept: an OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.

Answer C is incorrect because the “DROTHER” option describes a different concept: an OSPF router on a multiaccess segment that is neither the DR nor the BDR.

Answer D is incorrect because the “DR” option describes a different concept: the designated router elected on a multiaccess OSPF network to reduce the number of adjacencies and LSA exchanges.

 

Question 23

For Hello packet, which statement is accurate?

1. An OSPF packet used to discover neighbors and maintain neighbor relationships.
2. A logical OSPF relationship formed between compatible routers so they can exchange routing information.
3. The OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.
4. An OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes an OSPF packet used to discover neighbors and maintain neighbor relationships.

Incorrect Answers

Answer B is incorrect because the “OSPF neighbor adjacency” option describes a different concept: a logical OSPF relationship formed between compatible routers so they can exchange routing information.

Answer C is incorrect because the “2-Way OSPF neighbor state” option describes a different concept: the OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.

Answer D is incorrect because the “OSPF priority 0” option describes a different concept: an OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.

 

Question 24

For Dead interval, which statement is accurate?

1. The OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.
2. The period an OSPF router waits without receiving expected Hellos before declaring a neighbor down.
3. On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.
4. A 32-bit dotted-decimal identifier that uniquely identifies an OSPF router within the routing domain.

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes the period an OSPF router waits without receiving expected Hellos before declaring a neighbor down.

Incorrect Answers

Answer A is incorrect because the “2-Way OSPF neighbor state” option describes a different concept: the OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.

Answer C is incorrect because the “OSPF interface priority” option describes a different concept: On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.

Answer D is incorrect because the “Router ID” option describes a different concept: a 32-bit dotted-decimal identifier that uniquely identifies an OSPF router within the routing domain.

 

Question 25

For Area 0, which statement is accurate?

1. The OSPF metric associated with an interface and used to calculate the lowest-cost path.
2. The OSPF backbone area; a single-area OSPF deployment commonly places all participating interfaces in this area.
3. An OSPF packet used to discover neighbors and maintain neighbor relationships.
4. A logical OSPF relationship formed between compatible routers so they can exchange routing information.

Correct Answer: B

 

Correct Answer

Answer B is correct because it accurately defines Area 0. The matching definition is: The OSPF backbone area; a single-area OSPF deployment commonly places all participating interfaces in this area.

Incorrect Answers

Answer A is incorrect because the “OSPF cost” option describes a different concept: the OSPF metric associated with an interface and used to calculate the lowest-cost path.

Answer C is incorrect because the “Hello packet” option describes a different concept: an OSPF packet used to discover neighbors and maintain neighbor relationships.

Answer D is incorrect because the “OSPF neighbor adjacency” option describes a different concept: a logical OSPF relationship formed between compatible routers so they can exchange routing information.

 

Question 26

For DR, which statement is accurate?

1. An OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.
2. The period an OSPF router waits without receiving expected Hellos before declaring a neighbor down.
3. The designated router elected on a multiaccess OSPF network to reduce the number of adjacencies and LSA exchanges.
4. OSPF uses the IPv4 multicast address 224.0.0.6, AllDRouters, for messages intended for the DR and BDR on a broadcast network.

Correct Answer: C

 

Correct Answer

Answer C is correct because the choice accurately describes DR: The designated router elected on a multiaccess OSPF network to reduce the number of adjacencies and LSA exchanges.

Incorrect Answers

Answer A is incorrect because the “OSPF priority 0” option describes a different concept: an OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.

Answer B is incorrect because the “Dead interval” option describes a different concept: the period an OSPF router waits without receiving expected Hellos before declaring a neighbor down.

Answer D is incorrect because the “224.0.0.6” option describes a different concept: OSPF uses the IPv4 multicast address 224.0.0.6, AllDRouters, for messages intended for the DR and BDR on a broadcast network.

 

Question 27

For BDR, which statement is accurate?

1. A 32-bit dotted-decimal identifier that uniquely identifies an OSPF router within the routing domain.
2. OSPF uses the IPv4 multicast address 224.0.0.6, AllDRouters, for messages intended for the DR and BDR on a broadcast network.
3. The backup designated router elected to take over the DR role if the DR fails.
4. On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes the backup designated router elected to take over the DR role if the DR fails.

Incorrect Answers

Answer A is incorrect because the “Router ID” option describes a different concept: a 32-bit dotted-decimal identifier that uniquely identifies an OSPF router within the routing domain.

Answer B is incorrect because the “224.0.0.6” option describes a different concept: OSPF uses the IPv4 multicast address 224.0.0.6, AllDRouters, for messages intended for the DR and BDR on a broadcast network.

Answer D is incorrect because the “OSPF interface priority” option describes a different concept: On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.

 

Question 28

For DROTHER, which statement is accurate?

1. On an OSPF broadcast multiaccess network such as Ethernet, routers elect a DR and BDR to reduce adjacency and LSA-exchange overhead.
2. On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.
3. An OSPF router on a multiaccess segment that is neither the DR nor the BDR.
4. An OSPF network type between two routers where DR and BDR elections are not required.

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes an OSPF router on a multiaccess segment that is neither the DR nor the BDR.

Incorrect Answers

Answer A is incorrect because the “Broadcast OSPF network” option describes a different concept: On an OSPF broadcast multiaccess network such as Ethernet, routers elect a DR and BDR to reduce adjacency and LSA-exchange overhead.

Answer B is incorrect because the “OSPF interface priority” option describes a different concept: On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.

Answer D is incorrect because the “Point-to-point OSPF network” option describes a different concept: an OSPF network type between two routers where DR and BDR elections are not required.

 

Question 29

For OSPF cost, which statement is accurate?

1. The OSPF metric associated with an interface and used to calculate the lowest-cost path.
2. OSPF interface cost is derived from reference bandwidth divided by interface bandwidth unless the cost is manually configured.
3. On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.
4. An OSPF router on a multiaccess segment that is neither the DR nor the BDR.

Correct Answer: A

 

Correct Answer

Answer A is correct because it accurately defines OSPF cost. The matching definition is: The OSPF metric associated with an interface and used to calculate the lowest-cost path.

Incorrect Answers

Answer B is incorrect because the “OSPF reference bandwidth” option describes a different concept: OSPF interface cost is derived from reference bandwidth divided by interface bandwidth unless the cost is manually configured.

Answer C is incorrect because the “OSPF interface priority” option describes a different concept: On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.

Answer D is incorrect because the “DROTHER” option describes a different concept: an OSPF router on a multiaccess segment that is neither the DR nor the BDR.

 

Question 30

For Point-to-point OSPF network, which statement is accurate?

1. On an OSPF broadcast multiaccess network such as Ethernet, routers elect a DR and BDR to reduce adjacency and LSA-exchange overhead.
2. The designated router elected on a multiaccess OSPF network to reduce the number of adjacencies and LSA exchanges.
3. An OSPF network type between two routers where DR and BDR elections are not required.
4. OSPF uses the IPv4 multicast address 224.0.0.6, AllDRouters, for messages intended for the DR and BDR on a broadcast network.

Correct Answer: C

 

Correct Answer

Answer C is correct because the choice accurately describes Point-to-point OSPF network: An OSPF network type between two routers where DR and BDR elections are not required.

Incorrect Answers

Answer A is incorrect because the “Broadcast OSPF network” option describes a different concept: On an OSPF broadcast multiaccess network such as Ethernet, routers elect a DR and BDR to reduce adjacency and LSA-exchange overhead.

Answer B is incorrect because the “DR” option describes a different concept: the designated router elected on a multiaccess OSPF network to reduce the number of adjacencies and LSA exchanges.

Answer D is incorrect because the “224.0.0.6” option describes a different concept: OSPF uses the IPv4 multicast address 224.0.0.6, AllDRouters, for messages intended for the DR and BDR on a broadcast network.

 

Question 31

For Broadcast OSPF network, which statement is accurate?

1. An OSPF router on a multiaccess segment that is neither the DR nor the BDR.
2. A logical OSPF relationship formed between compatible routers so they can exchange routing information.
3. The designated router elected on a multiaccess OSPF network to reduce the number of adjacencies and LSA exchanges.
4. On an OSPF broadcast multiaccess network such as Ethernet, routers elect a DR and BDR to reduce adjacency and LSA-exchange overhead.

Correct Answer: D

 

Correct Answer

Answer D is correct because On an OSPF broadcast multiaccess network such as Ethernet, routers elect a DR and BDR to reduce adjacency and LSA-exchange overhead.

Incorrect Answers

Answer A is incorrect because the “DROTHER” option describes a different concept: an OSPF router on a multiaccess segment that is neither the DR nor the BDR.

Answer B is incorrect because the “OSPF neighbor adjacency” option describes a different concept: a logical OSPF relationship formed between compatible routers so they can exchange routing information.

Answer C is incorrect because the “DR” option describes a different concept: the designated router elected on a multiaccess OSPF network to reduce the number of adjacencies and LSA exchanges.

 

Question 32

For OSPF interface priority, which statement is accurate?

1. On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.
2. An OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.
3. The OSPF metric associated with an interface and used to calculate the lowest-cost path.
4. An OSPF network type between two routers where DR and BDR elections are not required.

Correct Answer: A

 

Correct Answer

Answer A is correct because On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.

Incorrect Answers

Answer B is incorrect because the “OSPF priority 0” option describes a different concept: an OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.

Answer C is incorrect because the “OSPF cost” option describes a different concept: the OSPF metric associated with an interface and used to calculate the lowest-cost path.

Answer D is incorrect because the “Point-to-point OSPF network” option describes a different concept: an OSPF network type between two routers where DR and BDR elections are not required.

 

Question 33

For OSPF priority 0, which statement is accurate?

1. An OSPF router on a multiaccess segment that is neither the DR nor the BDR.
2. The backup designated router elected to take over the DR role if the DR fails.
3. OSPF uses the IPv4 multicast address 224.0.0.6, AllDRouters, for messages intended for the DR and BDR on a broadcast network.
4. An OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.

Correct Answer: D

 

Correct Answer

Answer D is correct because it accurately defines OSPF priority 0. The matching definition is: An OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.

Incorrect Answers

Answer A is incorrect because the “DROTHER” option describes a different concept: an OSPF router on a multiaccess segment that is neither the DR nor the BDR.

Answer B is incorrect because the “BDR” option describes a different concept: the backup designated router elected to take over the DR role if the DR fails.

Answer C is incorrect because the “224.0.0.6” option describes a different concept: OSPF uses the IPv4 multicast address 224.0.0.6, AllDRouters, for messages intended for the DR and BDR on a broadcast network.

 

Question 34

For 224.0.0.5, which statement is accurate?

1. The OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.
2. An OSPF network type between two routers where DR and BDR elections are not required.
3. The Cisco IOS OSPF process ID identifies a local OSPF process and does not need to match between neighboring routers.
4. OSPF uses the IPv4 multicast address 224.0.0.5, AllSPFRouters, for messages intended for all OSPF routers on the local link.

Correct Answer: D

 

Correct Answer

Answer D is correct because the choice accurately describes 224.0.0.5: OSPF uses the IPv4 multicast address 224.0.0.5, AllSPFRouters, for messages intended for all OSPF routers on the local link.

Incorrect Answers

Answer A is incorrect because the “2-Way OSPF neighbor state” option describes a different concept: the OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.

Answer B is incorrect because the “Point-to-point OSPF network” option describes a different concept: an OSPF network type between two routers where DR and BDR elections are not required.

Answer C is incorrect because the “OSPF process ID” option describes a different concept: the Cisco IOS OSPF process ID identifies a local OSPF process and does not need to match between neighboring routers.

 

Question 35

For 224.0.0.6, which statement is accurate?

1. On an OSPF broadcast multiaccess network such as Ethernet, routers elect a DR and BDR to reduce adjacency and LSA-exchange overhead.
2. OSPF uses the IPv4 multicast address 224.0.0.6, AllDRouters, for messages intended for the DR and BDR on a broadcast network.
3. OSPF uses the IPv4 multicast address 224.0.0.5, AllSPFRouters, for messages intended for all OSPF routers on the local link.
4. An OSPF router on a multiaccess segment that is neither the DR nor the BDR.

Correct Answer: B

 

Correct Answer

Answer B is correct because OSPF uses the IPv4 multicast address 224.0.0.6, AllDRouters, for messages intended for the DR and BDR on a broadcast network.

Incorrect Answers

Answer A is incorrect because the “Broadcast OSPF network” option describes a different concept: On an OSPF broadcast multiaccess network such as Ethernet, routers elect a DR and BDR to reduce adjacency and LSA-exchange overhead.

Answer C is incorrect because the “224.0.0.5” option describes a different concept: OSPF uses the IPv4 multicast address 224.0.0.5, AllSPFRouters, for messages intended for all OSPF routers on the local link.

Answer D is incorrect because the “DROTHER” option describes a different concept: an OSPF router on a multiaccess segment that is neither the DR nor the BDR.

 

Question 36

For Full OSPF neighbor state, which statement is accurate?

1. The OSPF Full state indicates that neighboring routers have completed database synchronization for that adjacency.
2. An OSPF packet used to discover neighbors and maintain neighbor relationships.
3. A logical OSPF relationship formed between compatible routers so they can exchange routing information.
4. On an OSPF broadcast multiaccess network such as Ethernet, routers elect a DR and BDR to reduce adjacency and LSA-exchange overhead.

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes the OSPF Full state indicates that neighboring routers have completed database synchronization for that adjacency.

Incorrect Answers

Answer B is incorrect because the “Hello packet” option describes a different concept: an OSPF packet used to discover neighbors and maintain neighbor relationships.

Answer C is incorrect because the “OSPF neighbor adjacency” option describes a different concept: a logical OSPF relationship formed between compatible routers so they can exchange routing information.

Answer D is incorrect because the “Broadcast OSPF network” option describes a different concept: On an OSPF broadcast multiaccess network such as Ethernet, routers elect a DR and BDR to reduce adjacency and LSA-exchange overhead.

 

Question 37

For 2-Way OSPF neighbor state, which statement is accurate?

1. A logical OSPF relationship formed between compatible routers so they can exchange routing information.
2. The OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.
3. An OSPF router on a multiaccess segment that is neither the DR nor the BDR.
4. An OSPF packet used to discover neighbors and maintain neighbor relationships.

Correct Answer: B

 

Correct Answer

Answer B is correct because it accurately defines 2-Way OSPF neighbor state. The matching definition is: The OSPF 2-Way state confirms bidirectional Hello communication and is a normal stable state between DROTHER routers on a broadcast segment.

Incorrect Answers

Answer A is incorrect because the “OSPF neighbor adjacency” option describes a different concept: a logical OSPF relationship formed between compatible routers so they can exchange routing information.

Answer C is incorrect because the “DROTHER” option describes a different concept: an OSPF router on a multiaccess segment that is neither the DR nor the BDR.

Answer D is incorrect because the “Hello packet” option describes a different concept: an OSPF packet used to discover neighbors and maintain neighbor relationships.

 

Question 38

For OSPF process ID, which statement is accurate?

1. The OSPF Full state indicates that neighboring routers have completed database synchronization for that adjacency.
2. A logical OSPF relationship formed between compatible routers so they can exchange routing information.
3. A 32-bit dotted-decimal identifier that uniquely identifies an OSPF router within the routing domain.
4. The Cisco IOS OSPF process ID identifies a local OSPF process and does not need to match between neighboring routers.

Correct Answer: D

 

Correct Answer

Answer D is correct because the choice accurately describes OSPF process ID: The Cisco IOS OSPF process ID identifies a local OSPF process and does not need to match between neighboring routers.

Incorrect Answers

Answer A is incorrect because the “Full OSPF neighbor state” option describes a different concept: the OSPF Full state indicates that neighboring routers have completed database synchronization for that adjacency.

Answer B is incorrect because the “OSPF neighbor adjacency” option describes a different concept: a logical OSPF relationship formed between compatible routers so they can exchange routing information.

Answer C is incorrect because the “Router ID” option describes a different concept: a 32-bit dotted-decimal identifier that uniquely identifies an OSPF router within the routing domain.

 

Question 39

For OSPF reference bandwidth, which statement is accurate?

1. An OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.
2. The OSPF backbone area; a single-area OSPF deployment commonly places all participating interfaces in this area.
3. On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.
4. OSPF interface cost is derived from reference bandwidth divided by interface bandwidth unless the cost is manually configured.

Correct Answer: D

 

Correct Answer

Answer D is correct because OSPF interface cost is derived from reference bandwidth divided by interface bandwidth unless the cost is manually configured.

Incorrect Answers

Answer A is incorrect because the “OSPF priority 0” option describes a different concept: an OSPF interface priority of 0 makes that router ineligible to become the DR or BDR on the segment.

Answer B is incorrect because the “Area 0” option describes a different concept: the OSPF backbone area; a single-area OSPF deployment commonly places all participating interfaces in this area.

Answer C is incorrect because the “OSPF interface priority” option describes a different concept: On a broadcast segment, OSPF interface priority is considered before router ID when electing the DR and BDR; the higher eligible priority is preferred.

 

Question 40

For Passive OSPF interface, which statement is accurate?

1. A logical OSPF relationship formed between compatible routers so they can exchange routing information.
2. The OSPF Full state indicates that neighboring routers have completed database synchronization for that adjacency.
3. An OSPF passive interface can advertise its connected network while suppressing OSPF Hellos and neighbor formation on that interface.
4. An OSPF packet used to discover neighbors and maintain neighbor relationships.

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes an OSPF passive interface can advertise its connected network while suppressing OSPF Hellos and neighbor formation on that interface.

Incorrect Answers

Answer A is incorrect because the “OSPF neighbor adjacency” option describes a different concept: a logical OSPF relationship formed between compatible routers so they can exchange routing information.

Answer B is incorrect because the “Full OSPF neighbor state” option describes a different concept: the OSPF Full state indicates that neighboring routers have completed database synchronization for that adjacency.

Answer D is incorrect because the “Hello packet” option describes a different concept: an OSPF packet used to discover neighbors and maintain neighbor relationships.