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Question 490
An engineer wants to inspect the link-state advertisements held by the local OSPFv2 process after neighbors synchronize, rather than installed RIB routes or received interface counters. Which IOS command shows the local LSDB?
- show ip route ospf
- show ip ospf neighbor
- Run show ip ospf database
- show interfaces counters
Explanation
Correct Answer
C:The show ip ospf database command displays the local OSPF link-state database and the LSAs used by SPF, separate from installed routes in show ip route.
Incorrect Answers
A:This reports OSPF routes selected into the RIB; not every LSA in the link-state database becomes a selected installed route.
B:This reports peers and adjacency states, not the full set of received and originated link-state advertisements.
D:Ethernet counters are physical and link-layer statistics rather than OSPF LSA contents.
Question 491
An IOS OSPFv2 process 1 is in process configuration mode. It must include only IPv4 addresses from 10.7.2.0/24 in area 0 using a `network` statement. Which exact network/wildcard/area combination meets the scope?
- network 10.7.2.0 255.255.255.0 area 0
- Use network 10.7.2.0 0.0.0.255 area 0
- network 10.7.2.0 0.0.0.255 area 1
- network 10.7.2.0 0.0.255.255 area 0
Explanation
Correct Answer
B:The OSPF process network statement uses wildcard 0.0.0.255 to select a /24 address range and area 0 to place matched interfaces in the intended OSPF backbone.
Incorrect Answers
A:The network statement uses inverse wildcard matching, not an IPv4 /24 subnet mask in the wildcard position.
C:The network and wildcard are appropriate but area 1 is not the specified backbone area 0.
D:This wildcard is much broader than /24 and can match additional interfaces not authorized for the requested OSPF area.
Question 492
An IOS router unexpectedly advertises a connected LAN in OSPF, and the team wants to examine which OSPF process networks and passive interfaces are configured before making changes. Which show command provides a concise starting point?
- show ip arp
- show interfaces trunk
- show ip protocols
- show mac address-table
Explanation
Correct Answer
C:`show ip protocols` summarizes active routing processes, networks, and passive-interface information, supporting process-scope inspection before changing OSPF configuration.
Incorrect Answers
A:ARP resolves local IPv4 next-hop IP addresses into link-layer entries and does not report an OSPF process network match.
B:Trunk output concerns tagged VLAN transport and cannot directly establish which routed subnets are selected by OSPF network statements.
D:A switch MAC address table reveals L2 learning, not routing protocol participation and passive-interface settings.
Question 493
Gi0/2 faces a host-only subnet that should be advertised to OSPF routers through other interfaces, but no OSPF neighbor should form on the host-facing segment. Which interface behavior is appropriate?
- Remove the entire user subnet from OSPF so it cannot be advertised anywhere
- Set interface OSPF priority 0 to block all Hello packets
- Make the host VLAN an OSPF stub area rather than change the interface behavior
- Configure that host-facing interface passive
Explanation
Correct Answer
D:A passive OSPF interface can advertise its connected prefix without forming neighbors there.
Incorrect Answers
A:The requirement is to advertise the connected prefix to neighbors on other links while suppressing Hellos toward local users.
B:Priority 0 affects DR/BDR eligibility on broadcast links but the interface still sends and receives OSPF Hellos.
C:Area type is not a substitute for preventing neighbor formation on an endpoint-facing interface.
Question 494
R1 has OSPFv2 network statements matching Ethernet0/1 on subnet 10.7.2.0/24, and the interface is configured `passive-interface Ethernet0/1`. Assuming the interface participates in the OSPF process, what is the result?
- The connected subnet can still be advertised by OSPF, but OSPF hellos and neighbor adjacency do not form on that passive interface
- OSPF forms a full neighbor adjacency on Ethernet0/1 but suppresses advertisements of 10.7.2.0/24
- OSPF forces the interface into administratively down state and disables ordinary IP forwarding
- The interface changes its OSPF routing protocol from IP protocol 89 to TCP port 179
Explanation
Correct Answer
A:Passive-interface suppresses OSPF hello exchange and neighbor formation on that interface while still allowing the matched connected network to be advertised through the local OSPF process.
Incorrect Answers
B:Without hellos, the interface cannot form the full neighbor adjacency claimed here, and passive status does not inherently remove the connected prefix from advertisement.
C:Passive-interface affects OSPF control-plane exchanges, not the interface’s administrative state or ordinary IP data forwarding.
D:OSPF remains IP protocol 89; TCP port 179 is associated with BGP, not a passive-mode replacement for OSPF.
Question 495
The OSPF neighbor is not forming and the operator suspects Gi0/1 was added to area 1 instead of area 0. Which interface display exposes the configured area and operational OSPF properties?
- Read show ip route ospf and infer the local interface area from learned prefixes
- Use show ip ospf neighbor and assume an empty table exposes the wrong area value
- Inspect show ip ospf interface
- Change the OSPF router ID before inspecting interface area configuration
Explanation
Correct Answer
C:Operational interface output includes its configured OSPF area.
Incorrect Answers
A:Routing tables report installed destinations but do not directly enumerate the OSPF area configured on Gi0/1.
B:Missing neighbors is a symptom; detailed interface output provides the area and Hello properties to compare.
D:Duplicate IDs may cause failures, but this question specifically calls for reading configured area numbers and interface OSPF state.
Question 496
Two intra-area OSPF paths have the same destination prefix and route type with total costs 40 and 60. Which metric preference selects the better candidate?
- Select the path with cost 60 because higher cost indicates a better link
- Select the path learned first regardless of the current metric
- Use the path with lowest total OSPF metric
- Choose the path with an alphabetically earlier neighbor interface name
Explanation
Correct Answer
C:OSPF chooses shortest total cost through the topology.
Incorrect Answers
A:OSPF is a shortest-path protocol and prefers lower total cost (40) when candidates have matching route type and prefix.
B:Arrival order is not the preferred route criterion over eligible lower-cost intra-area OSPF paths.
D:Interface labels do not override the computed total OSPF path metric.
Question 497
An interface's default OSPF cost is inappropriate for its slow WAN link. Which direct per-interface OSPF command changes its contribution to path cost?
- Change the router-id to a lower numeric value to increase its path cost
- Set ip ospf cost on the target interface
- Change the OSPF Hello timer and expect it to adjust SPF interface cost
- Set OSPF priority 255 and assume this changes route cost
Explanation
Correct Answer
B:An explicit interface cost influences the shortest-path calculation.
Incorrect Answers
A:Router ID is a process identifier, not the per-interface cost used in SPF.
C:Hello timer influences neighbor liveness, not the link’s configured OSPF path cost.
D:Priority affects DR election on broadcast networks rather than path metric.
Question 498
Three OSPFv2 routers already completed DR/BDR election on an Ethernet LAN. Router A is DR, B is BDR, and C is DROTHER. A fails while B and C remain reachable. What is the normal next election outcome?
- C instantly takes DR because it has the numerically highest IP address
- B remains permanently BDR and no DR is selected until all routers restart
- B takes over the DR role and the segment elects a replacement BDR from eligible remaining routers
- The router with lowest OSPF cost to a remote prefix becomes DR automatically
Explanation
Correct Answer
C:The surviving BDR assumes the DR role after failure detection; eligible neighbors then elect a replacement BDR according to OSPF election behavior.
Incorrect Answers
A:An OSPF DR election uses router interface priority and RID among eligible participants; an arbitrary higher interface IPv4 address does not override the already elected BDR role.
B:The BDR exists so a segment can promote it if the DR disappears. A new BDR can then be elected without restarting every OSPF process.
D:OSPF path metric determines route cost, not which router becomes DR on a broadcast multiaccess network.
Question 499
A router runs OSPF on a user-only SVI to advertise its subnet, but should never send OSPF Hellos or elect neighbors on that user VLAN. What passive-interface behavior provides that result?
- Make the interface passive in the OSPF process
- Set ip ospf priority 0 and assume Hellos stop on that user VLAN
- Disable IP routing on the SVI and expect OSPF still to advertise the attached subnet
- Configure an OSPF area range on the user SVI instead of passive-interface
Explanation
Correct Answer
A:Passive mode suppresses outgoing hellos on that interface.
Incorrect Answers
B:Priority 0 removes DR/BDR candidacy but does not suppress OSPF Hellos or all neighbor activity.
C:That would undermine the requested routed interface and is not how passive-interface retains network advertisement.
D:Summarization/area range operations do not prohibit OSPF Hello messages on the endpoint-facing VLAN.
Question 500
Two connected OSPFv2 peers see each other's Hello packets but report differing area numbers for the same link, preventing a proper adjacency. Which area setting must be made consistent?
- Match the area IDs configured at the peers
- Match OSPF router priorities but leave one interface in area 1 and the other in area 0
- Match interface MTUs only while ignoring mismatched area IDs
- Use the same process number on both peers and assume areas no longer matter
Explanation
Correct Answer
A:OSPF adjacency needs compatible area IDs on the common segment.
Incorrect Answers
B:Priority changes DR election eligibility; peers on a link still require compatible area identifiers.
C:MTU mismatches can affect adjacency progression, but do not resolve a fundamental area mismatch in Hello parameters.
D:OSPF process IDs are locally significant, while the area of the shared link must agree.
Cisco Certified Network Associate (CCNA) (200-301) Practice Tests