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Chapters 6 – 10: OSPF Exam Answers
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CCNP ENARSI v8 Chapters 6 – 10: OSPF Test Online
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Question 1 of 34
1. Question
1 pointsWhich two commands will configure OSPFv2 MD5 authentication on a router interface? (Choose two.)Correct
Incorrect
Hint
The area 0 authentication message-digest command configures OSPF MD5 authentication globally. The router ospf 10 , default-information originate , and ip ospf priority 255 commands configure general OSPF routing functions that are not related to authentication. -
Question 2 of 34
2. Question
1 pointsAt which OSPF state are neighbor routers converged and able to exchange routing updates?Correct
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Hint
OSPF neighbors that reach the Full state are converged and can exchange routing information. -
Question 3 of 34
3. Question
1 pointsWhat will an OSPF router prefer to use first as a router ID?Correct
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Hint
The first preference for an OSPF router ID is an explicitly configured 32-bit address. This address is not included in the routing table and is not defined by the network command. If a router ID that is configured through the router-id command is not available, OSPF routers next use the highest IP address available on a loopback interface, as loopbacks used as router IDs are also not routable addresses. Lacking either of these alternatives, an OSPF router will use the highest IP address from its active physical interfaces. -
Question 4 of 34
4. Question
1 pointsWhat are three entries that are displayed by the show ip ospf neighbor command? (Choose three.)Correct
Incorrect
Hint
The route metric and neighbor next hop address are routing table entries that are displayed by the show ip route command. The show ip ospf neighbor command does not display the OSPF process ID or the OSPF area number. -
Question 5 of 34
5. Question
1 pointsRefer to the exhibit. Which three statements describe the results of the OSPF election process of the topology that is shown in the exhibit? (Choose three.)Correct
Incorrect
Hint
R2 will be elected DR because it has the highest priority of 255, all of the others have a priority of 1. R3 will be elected BDR because it has the numerically highest router-ID of 192.168.1.4. The R4 router-ID is 172.16.1.1 because it is the IPv4 address attached to the loopback 0 interface. -
Question 6 of 34
6. Question
1 pointsIn which two situations would an OSPF point-to-multipoint configuration be used? (Choose two.)Correct
Incorrect
Hint
Frame Relay and Layer 2 VPN topologies can use a point-to-multipoint OSPF network type. This type of network is connected in a hub-and-spoke configuration and uses the same IP subnet. -
Question 7 of 34
7. Question
1 pointsRefer to the exhibit. OSPF is used in the network. Which path will be chosen by OSPF to send data packets from Net A to Net B?Correct
Incorrect
Hint
OSPF uses the shortest path first algorithm to select the best path to forward packets. Each path is labeled with a value for cost and this algorithm accumulates costs along each path, from source to destination. The path chosen from Net A to Net B is R1-R3-R5-R7, that is equal to 5+7+14+2=28, the shortest cost. -
Question 8 of 34
8. Question
1 pointsWhich OSPF router or routers would require the following command to define a stub area?router(config-router)# area [ area-id ] stub
Correct
Incorrect
Hint
The area type flag in hello packets must match between adjacent OSPF routers. For this reason, all routers in the stub area must be configured as a stub area. -
Question 9 of 34
9. Question
1 pointsA network engineer new to a company notices that a particular Layer 3 device participating in routing OSPF networks has an interface the engineer has not seen before in the output of the show ip ospf interface brief command. The interface is listed as VL0 and has a state of P2P with an OSPF neighbor. Which OSPF feature is the company using?Correct
Incorrect
Hint
When two Layer 3 devices are each configured with the area area-id virtual-link endpoint-RID command, a virtual link is formed. To verify that the virtual link is up, use the show ip ospf virtual-links command. The virtual link also appears as an OSPF VL interface within the output of the show ip ospf interface [brief] command. -
Question 10 of 34
10. Question
1 pointsWhat are the only two roles that permit an OSPF router to be configured for summarization? (Choose two.)Correct
Incorrect
Hint
Because the LSDBs on every router within an area must be the same, OSPF summarization can only be done between areas, or between autonomous systems. For this reason, only an ABR or an ASBR can be configured to perform summarization. An ABR can summarize interarea routes between areas, and an ASBR can summarize external routes as they enter the OSPF domain. -
Question 11 of 34
11. Question
1 pointsWhich three statements describe features of the OSPF topology table? (Choose three.)Correct
Incorrect
Hint
The topology table on an OSPF router is a link-state database (LSDB) that lists information about all other routers in the network, and represents the network topology. All routers within an area have identical link-state databases, and the table can be viewed using the show ip ospf database command. The EIGRP topology table contains feasible successor routes. This concept is not used by OSPF. The SPF algorithm uses the LSDB to produce the unique routing table for each router which contains the lowest cost route entries for known networks. -
Question 12 of 34
12. Question
1 pointsWhich type of OSPF LSA represents an external route and is propagated across the entire OSPF domain?Correct
Incorrect
Hint
Type 5 LSAs are used for external routes and are generated by an ASBR. They are forwarded into other areas by ABRs. -
Question 13 of 34
13. Question
1 pointsRefer to the exhibit. Why are routers R1 and R2 not able to establish an OSPF adjacency?Correct
Incorrect
Hint
On router R1, the network 192.168.10.0/30 is defined in the wrong area (area 1). It has to be defined in area 0 in order to establish adjacency with router R2, which has the network 192.168.10.0/30 defined in area 0. -
Question 14 of 34
14. Question
1 pointsRefer to the exhibit. A company uses OSPF as its internal routing protocol. No routing protocol is used between the company and the ISP. The network administrator enters the following command on the router that connects to the ISP.ip route 0.0.0.0 0.0.0.0 S0/0/0 120
The router does not show a default route and packets that are destined for noncompany networks are being dropped. What is the problem?Correct
Incorrect
Hint
The administrative distance does not matter in this case because (1) there is not an equal route in OSPF and (2) because the company is not running OSPF with the ISP. The interface is the correct one and using an exit interface is acceptable on a serial link. No network statements are required for static routes. A link must be up in order for a static route that uses the link to be shown in the routing table. -
Question 15 of 34
15. Question
1 pointsWhat are two reasons that will prevent two routers from forming an OSPFv2 adjacency? (Choose two.)Correct
Incorrect
Hint
There may be several reasons why two routers running OSPF will fail to form an OSPF adjacency, including these: The subnet masks do not match, causing the routers to be on separate networks. OSPF Hello or Dead Timers do not match. OSPF network types do not match. There is a missing or incorrect OSPF network command. Mismatched IOS versions, the use of private IP addresses, and different types of interface ports used on a switch are not causes for an OSPF adjacency failing to form between two routers. -
Question 16 of 34
16. Question
1 pointsA network engineer is troubleshooting convergence and adjacency issues in an OSPFv2 network and has noted that some expected network route entries are not displayed in the routing table. Which two commands will provide additional information about the state of router adjacencies, timer intervals, and the area ID? (Choose two.)Correct
Incorrect
Hint
The show ip ospf interface command will display routing table information that is already known. The show running-configuration and show ip protocols commands will display aspects of the OSPF configuration on the router but will not display adjacency state details or timer interval details. -
Question 17 of 34
17. Question
1 pointsRefer to the exhibit. A network administrator has configured OSPFv2 on the two Cisco routers but PC1 is unable to connect to PC2. What is the most likely problem?Correct
Incorrect
Hint
If a LAN network is not advertised using OSPFv2, a remote network will not be reachable. The output displays a successful neighbor adjacency between router R1 and R2 on the interface S0/0 of both routers. -
Question 18 of 34
18. Question
1 pointsRefer to the exhibit. A network administrator has configured OSPFv2 on the two Cisco routers as shown. The routers are unable to form a neighbor adjacency. What should be done to fix the problem?Correct
Incorrect
Hint
In order to form OSPFv2 neighbor adjacencies, two connected router interfaces must share the same subnet. Router R2 is shown in the topology with an IP address of 192.168.20.5 and does not exist on the same subnet as the 192.168.20.1 /30 IP address of S0/0 on router R1. -
Question 19 of 34
19. Question
1 pointsWhich OSPFv3 LSA type is used by ASBRs to announce routes learned through redistribution from other routing protocols?Correct
Incorrect
Hint
OSPFv3 uses type 5, AS external LSAs, to announce default routes and routers learned through redistribution from other routing protocols. -
Question 20 of 34
20. Question
1 pointsWhat is a purpose of the OSPFv3 type 8 and type 9 LSAs?Correct
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Hint
Two new LSA types are added to OSPFv3, type 8, link-local LSA, and type 9, interarea prefix LSA. These two LSAs advertise unicast prefixes and prevent the need for OSPF calculations when interface addresses are added or changed. -
Question 21 of 34
21. Question
1 pointsWhat are two features of OSPFv3? (Choose two.)Correct
Incorrect
Hint
OSPFv3 runs directly over IPv6 and inter-router communication for both IPv4 and IPv6 address families is handled by IPv6 link-local addressing. OSPV3 uses a 32-bit router ID for IPv4 and IPv6 address families routing. IPv6 addressing is not enabled by default on Cisco router interfaces. -
Question 22 of 34
22. Question
1 pointsA network technician is configuring OSPFv3 with address families on a Cisco router. To verify the configuration the technician issues the show ospfv3 interface brief command. Which three items of information would the technician expect to be displayed? (Choose three.)Correct
Incorrect
Hint
The show ospfv3 interface brief command displays associated process ID, area, address family (IPv4 or IPv6), interface state, and neighbor count. The state of OSPFv3 neighbor routers and the router IDs of OSPFv3 neighbor routers are displayed by the show ospfv3 ipv6 neighbor command. Hello and other timer intervals are displayed by the regular form of the show ospfv3 interface command. -
Question 23 of 34
23. Question
1 pointsWhat is described by the interarea prefix LSAs sent by an OSPFv3 ABR?Correct
Incorrect
Hint
The interarea prefix LSAs sent by an OSPFv3 Area Border Router advertise and describe routes that belong to other areas in the OSPF domain. -
Question 24 of 34
24. Question
1 pointsUnder which configuration mode are OSPFv3 summarization commands issued?Correct
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Hint
The summarization commands in OSPFv3 reside under the address-family configuration mode. -
Question 25 of 34
25. Question
1 pointsAn administrator attempts to change the router ID on a router that is running OSPFv3 by changing the IPv4 address on the router loopback interface. Once the IPv4 address is changed, the administrator notes that the router ID did not change. What two actions can the administrator take so that the router will use the new IPv4 address as the router ID? (Choose two.)Correct
Incorrect
Hint
There are two methods that can be used to change the router ID of an OSPF router. The router can be rebooted or the OSPF process can be cleared. -
Question 26 of 34
26. Question
1 pointsRefer to the exhibit. An administrator is trying to configure R1 to run OSPFv3 but the neighbor adjacency is not forming with the router connected to Fa0/0. What is the cause of the problem?Correct
Incorrect
Hint
The output of show ipv6 ospf interface fa0/0 shows that OSPFv3 is not enabled on the interface even though the command is in the running configuration. This is because no router ID has been configured on this router. The router ID in OSPFv3 is a 32 bit number, similar to the ID in OSPFv2. If the router ID is not manually specified then an IPv4 address from one of the interfaces is used instead. This router has no IPv4 addresses configured on it so a router ID cannot be automatically chosen. The router-id command must be configured under ipv6 router ospf 1 in order to fix this problem. -
Question 27 of 34
27. Question
1 pointsRefer to the exhibit. A network administrator is configuring OSPF for R1 and R2, but the adjacency cannot be established. What is the cause of the issue?Correct
Incorrect
Hint
To form a neighbor relationship between OSPF speaking routers, the routers should reside on the same network and have the same Hello and dead intervals. Others criteria that must match are area ID and network type. In the topology displayed, the two routers are in two different areas, thus causing an area mismatch error. -
Question 28 of 34
28. Question
1 pointsRefer to the exhibit. Directly connected networks configured on router R1 are not being shared with neighboring routers through OSPFv3. What is the cause of the issue?Correct
Incorrect
Hint
Unlike OSPFv2, OSPFV3 does not use the network command to advertise directly attached networks. OSPFv3 is enabled directly on the interface. Once the command ipv6 ospf process_id area area_id is entered on the interface, that particular network will be included in OSPFv3 advertisements. -
Question 29 of 34
29. Question
1 pointsWhich command is used to enable OSPFv3 and address families on an interface?Correct
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Hint
The OSPFv3 process is enabled on an interface-by-interface basis in interface configuration mode with the ospfv3 pid { ipv4 | ipv6 } area area-id command. -
Question 30 of 34
30. Question
1 pointsRefer to the exhibit. A network technician is troubleshooting missing OSPFv3 routes on a router. What is the cause of the problem based on the command output?Correct
Incorrect
Hint
If the output of the show ipv6 ospf neighbor command does not show a state of FULL or 2WAY , the two routers have not formed an OSPFv3 adjacency. If two routers do not establish an adjacency, the link-state information will not be exchanged, and routes to destination networks may not exist. -
Question 31 of 34
31. Question
1 pointsThe OSPF hello timer has been set to 15 seconds on a router in a point-to-point network. By default, what is the dead interval on this router?Correct
Incorrect
Hint
By default, the dead interval is calculated as 4 times the hello interval. -
Question 32 of 34
32. Question
1 pointsRefer to the exhibit of the routing table from a router that is a backbone router and the ABR router for area 1. How will this routing table change, if any, if area 1 is configured as a stub area?Correct
Incorrect
Hint
The ABR for the Area 1 routing table will not change. The ABR connects to the backbone area as well as Area 1. The ABR router continues to receive external routes and intra-area routes through the interface that connects to the backbone area. -
Question 33 of 34
33. Question
1 pointsWhich command is used to verify that OSPF is enabled and also provides a list of the networks that are being advertised by the network?Correct
Incorrect
Hint
The command show ip ospf interface verifies the active OSPF interfaces. The command show ip interface brief is used to check that the interfaces are operational. The command show ip route ospf displays the entries that are learned via OSPF in the routing table. The command show ip protocol s checks that OSPF is enabled and lists the networks that are advertised. -
Question 34 of 34
34. Question
1 pointsRefer to the exhibit. Which configuration on R1 would advertise a summary route of the two LANs to R2?Correct
Incorrect
Hint
The network prefix 2001:db8:20::/44 will summarize the 2001:db8:21:10::/64 and 2001:db8:22:10::/64 networks.