Cisco CCNA 200-301 Router Forwarding Decisions Practice Test

Topic 21 focuses on Router Forwarding Decisions 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 forwarding rule selects the matching route with the greatest number of prefix bits?

1. Administrative distance comparison
2. Packet forwarding
3. Default route
4. Longest prefix match

Correct Answer: D

 

Correct Answer

Answer D is correct because the selected answer describes the forwarding rule that selects the matching route with the greatest number of prefix bits.

Incorrect Answers

Answer A is incorrect because the “Administrative distance comparison” option describes a different concept: a route-selection step used when different routing sources offer routes to the same destination prefix.

Answer B is incorrect because the “Packet forwarding” option describes a different concept: the data-plane action of sending a packet toward its destination using the selected forwarding information.

Answer C is incorrect because the “Default route” option describes a different concept: the least-specific route used only when no more-specific routing-table entry matches a destination.

 

Question 2

Which route-selection step is used when different routing sources offer routes to the same destination prefix?

1. Route selection
2. Equal-cost multipath
3. Administrative distance comparison
4. Recursive lookup

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes a route-selection step used when different routing sources offer routes to the same destination prefix.

Incorrect Answers

Answer A is incorrect because the “Route selection” option describes a different concept: the control-plane process of determining which candidate route is installed as the preferred route for a prefix.

Answer B is incorrect because the “Equal-cost multipath” option describes a different concept: Forwarding across multiple paths that have the same best routing metric for a destination.

Answer D is incorrect because the “Recursive lookup” option describes a different concept: a routing lookup in which the router must resolve a next-hop address through another routing-table entry.

 

Question 3

Which route-selection step is used when the same routing protocol knows multiple routes to an identical destination prefix?

1. Metric comparison
2. Default route
3. Recursive lookup
4. Directly connected next hop

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes a route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.

Incorrect Answers

Answer B is incorrect because the “Default route” option describes a different concept: the least-specific route used only when no more-specific routing-table entry matches a destination.

Answer C is incorrect because the “Recursive lookup” option describes a different concept: a routing lookup in which the router must resolve a next-hop address through another routing-table entry.

Answer D is incorrect because the “Directly connected next hop” option describes a different concept: a next-hop router address that resides on a network attached to one of the local router interfaces.

 

Question 4

What is a routing lookup in which the router must resolve a next-hop address through another routing-table entry?

1. Default route
2. Administrative distance comparison
3. Recursive lookup
4. Directly connected next hop

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes a routing lookup in which the router must resolve a next-hop address through another routing-table entry.

Incorrect Answers

Answer A is incorrect because the “Default route” option describes a different concept: the least-specific route used only when no more-specific routing-table entry matches a destination.

Answer B is incorrect because the “Administrative distance comparison” option describes a different concept: a route-selection step used when different routing sources offer routes to the same destination prefix.

Answer D is incorrect because the “Directly connected next hop” option describes a different concept: a next-hop router address that resides on a network attached to one of the local router interfaces.

 

Question 5

Which next-hop router address resides on a network attached to one of the local router interfaces?

1. Longest prefix match
2. Directly connected next hop
3. Administrative distance comparison
4. Route selection

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes a next-hop router address that resides on a network attached to one of the local router interfaces.

Incorrect Answers

Answer A is incorrect because the “Longest prefix match” option describes a different concept: the forwarding rule that selects the matching route with the greatest number of prefix bits.

Answer C is incorrect because the “Administrative distance comparison” option describes a different concept: a route-selection step used when different routing sources offer routes to the same destination prefix.

Answer D is incorrect because the “Route selection” option describes a different concept: the control-plane process of determining which candidate route is installed as the preferred route for a prefix.

 

Question 6

Which least-specific route is used only when no more-specific routing-table entry matches a destination?

1. Equal-cost multipath
2. Administrative distance comparison
3. Default route
4. Metric comparison

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes the least-specific route used only when no more-specific routing-table entry matches a destination.

Incorrect Answers

Answer A is incorrect because the “Equal-cost multipath” option describes a different concept: Forwarding across multiple paths that have the same best routing metric for a destination.

Answer B is incorrect because the “Administrative distance comparison” option describes a different concept: a route-selection step used when different routing sources offer routes to the same destination prefix.

Answer D is incorrect because the “Metric comparison” option describes a different concept: a route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.

 

Question 7

Which term describes forwarding across multiple paths that have the same best routing metric for a destination?

1. Next-hop reachability
2. Equal-cost multipath
3. Longest prefix match
4. Packet forwarding

Correct Answer: B

 

Correct Answer

Answer B is correct because it describes forwarding across multiple paths that have the same best routing metric for a destination.

Incorrect Answers

Answer A is incorrect because the “Next-hop reachability” option describes a different concept: the requirement that a router be able to resolve how to reach a configured or learned next-hop address.

Answer C is incorrect because the “Longest prefix match” option describes a different concept: the forwarding rule that selects the matching route with the greatest number of prefix bits.

Answer D is incorrect because the “Packet forwarding” option describes a different concept: the data-plane action of sending a packet toward its destination using the selected forwarding information.

 

Question 8

What is the control-plane process of determining which candidate route is installed as the preferred route for a prefix?

1. Recursive lookup
2. Route selection
3. Longest prefix match
4. Equal-cost multipath

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes the control-plane process of determining which candidate route is installed as the preferred route for a prefix.

Incorrect Answers

Answer A is incorrect because the “Recursive lookup” option describes a different concept: a routing lookup in which the router must resolve a next-hop address through another routing-table entry.

Answer C is incorrect because the “Longest prefix match” option describes a different concept: the forwarding rule that selects the matching route with the greatest number of prefix bits.

Answer D is incorrect because the “Equal-cost multipath” option describes a different concept: Forwarding across multiple paths that have the same best routing metric for a destination.

 

Question 9

Which routing requirement means that a router must be able to resolve a path to a configured or learned next-hop address?

1. Next-hop reachability
2. Metric comparison
3. Equal-cost multipath
4. Directly connected next hop

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes the requirement that a router be able to resolve how to reach a configured or learned next-hop address.

Incorrect Answers

Answer B is incorrect because the “Metric comparison” option describes a different concept: a route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.

Answer C is incorrect because the “Equal-cost multipath” option describes a different concept: Forwarding across multiple paths that have the same best routing metric for a destination.

Answer D is incorrect because the “Directly connected next hop” option describes a different concept: a next-hop router address that resides on a network attached to one of the local router interfaces.

 

Question 10

What is the data-plane action of sending a packet toward its destination using the selected forwarding information?

1. Packet forwarding
2. Default route
3. Longest prefix match
4. Administrative distance comparison

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes the data-plane action of sending a packet toward its destination using the selected forwarding information.

Incorrect Answers

Answer B is incorrect because the “Default route” option describes a different concept: the least-specific route used only when no more-specific routing-table entry matches a destination.

Answer C is incorrect because the “Longest prefix match” option describes a different concept: the forwarding rule that selects the matching route with the greatest number of prefix bits.

Answer D is incorrect because the “Administrative distance comparison” option describes a different concept: a route-selection step used when different routing sources offer routes to the same destination prefix.

 

Question 11

For Longest prefix match, which statement is accurate?

1. The data-plane action of sending a packet toward its destination using the selected forwarding information.
2. A routing lookup in which the router must resolve a next-hop address through another routing-table entry.
3. The forwarding rule that selects the matching route with the greatest number of prefix bits.
4. The least-specific route used only when no more-specific routing-table entry matches a destination.

Correct Answer: C

 

Correct Answer

Answer C is correct because it accurately defines Longest prefix match. The matching definition is: The forwarding rule that selects the matching route with the greatest number of prefix bits.

Incorrect Answers

Answer A is incorrect because the “Packet forwarding” option describes a different concept: the data-plane action of sending a packet toward its destination using the selected forwarding information.

Answer B is incorrect because the “Recursive lookup” option describes a different concept: a routing lookup in which the router must resolve a next-hop address through another routing-table entry.

Answer D is incorrect because the “Default route” option describes a different concept: the least-specific route used only when no more-specific routing-table entry matches a destination.

 

Question 12

A router learns the same destination prefix from two different routing protocols. Which description identifies the comparison used to choose the route source?

1. A route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.
2. The forwarding rule that selects the matching route with the greatest number of prefix bits.
3. The control-plane process of determining which candidate route is installed as the preferred route for a prefix.
4. A route-selection step used when different routing sources offer routes to the same destination prefix.

Correct Answer: D

 

Correct Answer

Answer D is correct because the choice accurately describes Administrative distance comparison: A route-selection step used when different routing sources offer routes to the same destination prefix.

Incorrect Answers

Answer A is incorrect because the “Metric comparison” option describes a different concept: a route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.

Answer B is incorrect because the “Longest prefix match” option describes a different concept: the forwarding rule that selects the matching route with the greatest number of prefix bits.

Answer C is incorrect because the “Route selection” option describes a different concept: the control-plane process of determining which candidate route is installed as the preferred route for a prefix.

 

Question 13

For Metric comparison, which statement is accurate?

1. A route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.
2. Forwarding across multiple paths that have the same best routing metric for a destination.
3. The data-plane action of sending a packet toward its destination using the selected forwarding information.
4. The forwarding rule that selects the matching route with the greatest number of prefix bits.

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes a route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.

Incorrect Answers

Answer B is incorrect because the “Equal-cost multipath” option describes a different concept: Forwarding across multiple paths that have the same best routing metric for a destination.

Answer C is incorrect because the “Packet forwarding” option describes a different concept: the data-plane action of sending a packet toward its destination using the selected forwarding information.

Answer D is incorrect because the “Longest prefix match” option describes a different concept: the forwarding rule that selects the matching route with the greatest number of prefix bits.

 

Question 14

For Recursive lookup, which statement is accurate?

1. Forwarding across multiple paths that have the same best routing metric for a destination.
2. The forwarding rule that selects the matching route with the greatest number of prefix bits.
3. The control-plane process of determining which candidate route is installed as the preferred route for a prefix.
4. A routing lookup in which the router must resolve a next-hop address through another routing-table entry.

Correct Answer: D

 

Correct Answer

Answer D is correct because the selected answer describes a routing lookup in which the router must resolve a next-hop address through another routing-table entry.

Incorrect Answers

Answer A is incorrect because the “Equal-cost multipath” option describes a different concept: Forwarding across multiple paths that have the same best routing metric for a destination.

Answer B is incorrect because the “Longest prefix match” option describes a different concept: the forwarding rule that selects the matching route with the greatest number of prefix bits.

Answer C is incorrect because the “Route selection” option describes a different concept: the control-plane process of determining which candidate route is installed as the preferred route for a prefix.

 

Question 15

For Directly connected next hop, which statement is accurate?

1. The control-plane process of determining which candidate route is installed as the preferred route for a prefix.
2. A next-hop router address that resides on a network attached to one of the local router interfaces.
3. The requirement that a router be able to resolve how to reach a configured or learned next-hop address.
4. Forwarding across multiple paths that have the same best routing metric for a destination.

Correct Answer: B

 

Correct Answer

Answer B is correct because it accurately defines Directly connected next hop. The matching definition is: A next-hop router address that resides on a network attached to one of the local router interfaces.

Incorrect Answers

Answer A is incorrect because the “Route selection” option describes a different concept: the control-plane process of determining which candidate route is installed as the preferred route for a prefix.

Answer C is incorrect because the “Next-hop reachability” option describes a different concept: the requirement that a router be able to resolve how to reach a configured or learned next-hop address.

Answer D is incorrect because the “Equal-cost multipath” option describes a different concept: Forwarding across multiple paths that have the same best routing metric for a destination.

 

Question 16

A packet matches no specific prefix in the routing table. Which description explains how an installed default route is used?

1. The control-plane process of determining which candidate route is installed as the preferred route for a prefix.
2. The least-specific route used only when no more-specific routing-table entry matches a destination.
3. The data-plane action of sending a packet toward its destination using the selected forwarding information.
4. A next-hop router address that resides on a network attached to one of the local router interfaces.

Correct Answer: B

 

Correct Answer

Answer B is correct because the choice accurately describes Default route: The least-specific route used only when no more-specific routing-table entry matches a destination.

Incorrect Answers

Answer A is incorrect because the “Route selection” option describes a different concept: the control-plane process of determining which candidate route is installed as the preferred route for a prefix.

Answer C is incorrect because the “Packet forwarding” option describes a different concept: the data-plane action of sending a packet toward its destination using the selected forwarding information.

Answer D is incorrect because the “Directly connected next hop” option describes a different concept: a next-hop router address that resides on a network attached to one of the local router interfaces.

 

Question 17

For Equal-cost multipath, which statement is accurate?

1. Forwarding across multiple paths that have the same best routing metric for a destination.
2. The least-specific route used only when no more-specific routing-table entry matches a destination.
3. The control-plane process of determining which candidate route is installed as the preferred route for a prefix.
4. A route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.

Correct Answer: A

 

Correct Answer

Answer A is correct because it describes forwarding across multiple paths that have the same best routing metric for a destination.

Incorrect Answers

Answer B is incorrect because the “Default route” option describes a different concept: the least-specific route used only when no more-specific routing-table entry matches a destination.

Answer C is incorrect because the “Route selection” option describes a different concept: the control-plane process of determining which candidate route is installed as the preferred route for a prefix.

Answer D is incorrect because the “Metric comparison” option describes a different concept: a route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.

 

Question 18

For Route selection, which statement is accurate?

1. A route-selection step used when different routing sources offer routes to the same destination prefix.
2. The control-plane process of determining which candidate route is installed as the preferred route for a prefix.
3. A next-hop router address that resides on a network attached to one of the local router interfaces.
4. Forwarding across multiple paths that have the same best routing metric for a destination.

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes the control-plane process of determining which candidate route is installed as the preferred route for a prefix.

Incorrect Answers

Answer A is incorrect because the “Administrative distance comparison” option describes a different concept: a route-selection step used when different routing sources offer routes to the same destination prefix.

Answer C is incorrect because the “Directly connected next hop” option describes a different concept: a next-hop router address that resides on a network attached to one of the local router interfaces.

Answer D is incorrect because the “Equal-cost multipath” option describes a different concept: Forwarding across multiple paths that have the same best routing metric for a destination.

 

Question 19

For Next-hop reachability, which statement is accurate?

1. The data-plane action of sending a packet toward its destination using the selected forwarding information.
2. The control-plane process of determining which candidate route is installed as the preferred route for a prefix.
3. A route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.
4. The requirement that a router be able to resolve how to reach a configured or learned next-hop address.

Correct Answer: D

 

Correct Answer

Answer D is correct because it accurately defines Next-hop reachability. The matching definition is: The requirement that a router be able to resolve how to reach a configured or learned next-hop address.

Incorrect Answers

Answer A is incorrect because the “Packet forwarding” option describes a different concept: the data-plane action of sending a packet toward its destination using the selected forwarding information.

Answer B is incorrect because the “Route selection” option describes a different concept: the control-plane process of determining which candidate route is installed as the preferred route for a prefix.

Answer C is incorrect because the “Metric comparison” option describes a different concept: a route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.

 

Question 20

For Packet forwarding, which statement is accurate?

1. A routing lookup in which the router must resolve a next-hop address through another routing-table entry.
2. The least-specific route used only when no more-specific routing-table entry matches a destination.
3. The forwarding rule that selects the matching route with the greatest number of prefix bits.
4. The data-plane action of sending a packet toward its destination using the selected forwarding information.

Correct Answer: D

 

Correct Answer

Answer D is correct because the choice accurately describes Packet forwarding: The data-plane action of sending a packet toward its destination using the selected forwarding information.

Incorrect Answers

Answer A is incorrect because the “Recursive lookup” option describes a different concept: a routing lookup in which the router must resolve a next-hop address through another routing-table entry.

Answer B is incorrect because the “Default route” option describes a different concept: the least-specific route used only when no more-specific routing-table entry matches a destination.

Answer C is incorrect because the “Longest prefix match” option describes a different concept: the forwarding rule that selects the matching route with the greatest number of prefix bits.

 

Question 21

While working on a packet-forwarding problem, an administrator encounters this requirement: The forwarding rule that selects the matching route with the greatest number of prefix bits. Which answer is the most precise match?

1. Longest prefix match
2. Metric comparison
3. Equal-cost multipath
4. Administrative distance comparison

Correct Answer: A

 

Correct Answer

Answer A is correct because Longest prefix match is the most precise fit for the stated requirement. The forwarding rule that selects the matching route with the greatest number of prefix bits.

Incorrect Answers

Answer B is incorrect because the “Metric comparison” option describes a different concept: a route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.

Answer C is incorrect because the “Equal-cost multipath” option describes a different concept: Forwarding across multiple paths that have the same best routing metric for a destination.

Answer D is incorrect because the “Administrative distance comparison” option describes a different concept: a route-selection step used when different routing sources offer routes to the same destination prefix.

 

Question 22

In a branch routing change, the team must identify the technology that provides the following function: A route-selection step used when different routing sources offer routes to the same destination prefix. Which option should be selected?

1. Default route
2. Administrative distance comparison
3. Recursive lookup
4. Longest prefix match

Correct Answer: B

 

Correct Answer

Answer B is correct because the scenario is describing the role of Administrative distance comparison. A route-selection step used when different routing sources offer routes to the same destination prefix.

Incorrect Answers

Answer A is incorrect because the “Default route” option describes a different concept: the least-specific route used only when no more-specific routing-table entry matches a destination.

Answer C is incorrect because the “Recursive lookup” option describes a different concept: a routing lookup in which the router must resolve a next-hop address through another routing-table entry.

Answer D is incorrect because the “Longest prefix match” option describes a different concept: the forwarding rule that selects the matching route with the greatest number of prefix bits.

 

Question 23

A router has two OSPF paths to the same destination prefix. After the routing source is fixed, which comparison determines the preferred OSPF path?

1. Metric comparison
2. Packet forwarding
3. Next-hop reachability
4. Default route

Correct Answer: A

 

Correct Answer

Answer A is correct because Metric comparison directly provides the function required by the scenario. A route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.

Incorrect Answers

Answer B is incorrect because the “Packet forwarding” option describes a different concept: the data-plane action of sending a packet toward its destination using the selected forwarding information.

Answer C is incorrect because the “Next-hop reachability” option describes a different concept: the requirement that a router be able to resolve how to reach a configured or learned next-hop address.

Answer D is incorrect because the “Default route” option describes a different concept: the least-specific route used only when no more-specific routing-table entry matches a destination.

 

Question 24

During an IP connectivity troubleshooting session, the design calls for the following capability: A routing lookup in which the router must resolve a next-hop address through another routing-table entry. Which option names that capability most accurately?

1. Equal-cost multipath
2. Recursive lookup
3. Metric comparison
4. Default route

Correct Answer: B

 

Correct Answer

Answer B is correct because the operational requirement in the stem maps to Recursive lookup: A routing lookup in which the router must resolve a next-hop address through another routing-table entry.

Incorrect Answers

Answer A is incorrect because the “Equal-cost multipath” option describes a different concept: Forwarding across multiple paths that have the same best routing metric for a destination.

Answer C is incorrect because the “Metric comparison” option describes a different concept: a route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.

Answer D is incorrect because the “Default route” option describes a different concept: the least-specific route used only when no more-specific routing-table entry matches a destination.

 

Question 25

A route’s next-hop address lies in the subnet of a local router interface. Which description identifies this next-hop relationship?

1. Directly connected next hop
2. Route selection
3. Administrative distance comparison
4. Recursive lookup

Correct Answer: A

 

Correct Answer

Answer A is correct because Directly connected next hop is the most precise fit for the stated requirement. A next-hop router address that resides on a network attached to one of the local router interfaces.

Incorrect Answers

Answer B is incorrect because the “Route selection” option describes a different concept: the control-plane process of determining which candidate route is installed as the preferred route for a prefix.

Answer C is incorrect because the “Administrative distance comparison” option describes a different concept: a route-selection step used when different routing sources offer routes to the same destination prefix.

Answer D is incorrect because the “Recursive lookup” option describes a different concept: a routing lookup in which the router must resolve a next-hop address through another routing-table entry.

 

Question 26

While working on a packet-forwarding problem, an administrator encounters this requirement: The least-specific route used only when no more-specific routing-table entry matches a destination. Which answer is the most precise match?

1. Equal-cost multipath
2. Route selection
3. Default route
4. Recursive lookup

Correct Answer: C

 

Correct Answer

Answer C is correct because the scenario is describing the role of Default route. The least-specific route used only when no more-specific routing-table entry matches a destination.

Incorrect Answers

Answer A is incorrect because the “Equal-cost multipath” option describes a different concept: Forwarding across multiple paths that have the same best routing metric for a destination.

Answer B is incorrect because the “Route selection” option describes a different concept: the control-plane process of determining which candidate route is installed as the preferred route for a prefix.

Answer D is incorrect because the “Recursive lookup” option describes a different concept: a routing lookup in which the router must resolve a next-hop address through another routing-table entry.

 

Question 27

In a branch routing change, the team must identify the technology that provides the following function: Forwarding across multiple paths that have the same best routing metric for a destination. Which option should be selected?

1. Recursive lookup
2. Longest prefix match
3. Equal-cost multipath
4. Directly connected next hop

Correct Answer: C

 

Correct Answer

Answer C is correct because Equal-cost multipath directly provides the function required by the scenario. Forwarding across multiple paths that have the same best routing metric for a destination.

Incorrect Answers

Answer A is incorrect because the “Recursive lookup” option describes a different concept: a routing lookup in which the router must resolve a next-hop address through another routing-table entry.

Answer B is incorrect because the “Longest prefix match” option describes a different concept: the forwarding rule that selects the matching route with the greatest number of prefix bits.

Answer D is incorrect because the “Directly connected next hop” option describes a different concept: a next-hop router address that resides on a network attached to one of the local router interfaces.

 

Question 28

Before packets are forwarded, the router chooses which candidate route to install for each prefix. Which control-plane activity makes this choice?

1. Longest prefix match
2. Equal-cost multipath
3. Route selection
4. Metric comparison

Correct Answer: C

 

Correct Answer

Answer C is correct because the operational requirement in the stem maps to Route selection: The control-plane process of determining which candidate route is installed as the preferred route for a prefix.

Incorrect Answers

Answer A is incorrect because the “Longest prefix match” option describes a different concept: the forwarding rule that selects the matching route with the greatest number of prefix bits.

Answer B is incorrect because the “Equal-cost multipath” option describes a different concept: Forwarding across multiple paths that have the same best routing metric for a destination.

Answer D is incorrect because the “Metric comparison” option describes a different concept: a route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.

 

Question 29

During an IP connectivity troubleshooting session, the design calls for the following capability: The requirement that a router be able to resolve how to reach a configured or learned next-hop address. Which option names that capability most accurately?

1. Packet forwarding
2. Metric comparison
3. Route selection
4. Next-hop reachability

Correct Answer: D

 

Correct Answer

Answer D is correct because Next-hop reachability is the most precise fit for the stated requirement. The requirement that a router be able to resolve how to reach a configured or learned next-hop address.

Incorrect Answers

Answer A is incorrect because the “Packet forwarding” option describes a different concept: the data-plane action of sending a packet toward its destination using the selected forwarding information.

Answer B is incorrect because the “Metric comparison” option describes a different concept: a route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.

Answer C is incorrect because the “Route selection” option describes a different concept: the control-plane process of determining which candidate route is installed as the preferred route for a prefix.

 

Question 30

A router uses its installed forwarding information to send an arriving packet through the appropriate output interface. Which data-plane activity is being performed?

1. Equal-cost multipath
2. Recursive lookup
3. Metric comparison
4. Packet forwarding

Correct Answer: D

 

Correct Answer

Answer D is correct because the scenario is describing the role of Packet forwarding. The data-plane action of sending a packet toward its destination using the selected forwarding information.

Incorrect Answers

Answer A is incorrect because the “Equal-cost multipath” option describes a different concept: Forwarding across multiple paths that have the same best routing metric for a destination.

Answer B is incorrect because the “Recursive lookup” option describes a different concept: a routing lookup in which the router must resolve a next-hop address through another routing-table entry.

Answer C is incorrect because the “Metric comparison” option describes a different concept: a route-selection step used when the same routing protocol knows multiple routes to an identical destination prefix.