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Chapters 8 – 10: OSPF Exam Answers
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CCNP ENCOR v8 Chapters 8 – 10: OSPF Test Online
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Question 1 of 34
1. Question
1 pointsWhat is the function of the OSPF LSR packet?Correct
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Hint
LSR packets are used by OSPF routers to request link-state database information from a neighbor. -
Question 2 of 34
2. Question
1 pointsWhat are two characteristics of OSPF areas? (Choose two.)Correct
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Hint
OSPF is designed with a hierarchical architecture using the concept of areas. An area is a collection of connected networks and is identified with the network command. Area 0 is a special area known as the backbone. All other areas must connect to Area 0. -
Question 3 of 34
3. Question
1 pointsWhich three requirements are necessary for two OSPFv2 routers to form an adjacency? (Choose three.)Correct
Incorrect
Hint
The OSPFv2 process ID does not have to be the same on each router, and it is enabled globally, not separately on each interface. OSPFv3 (IPv6) uses link-local addresses to form an adjacency with a neighbor router, and requires the OSPF process to be enabled on the interface. -
Question 4 of 34
4. Question
1 pointsA network technician issues the following commands when configuring a router:R1(config)# router ospf 11 R1(config-router)# network 10.10.10.0 0.0.0.255 area 0
What does the number 11 represent?Correct
Incorrect
Hint
There is no autonomous system number to configure on OSPF. The area number is located at the end of the network statement. The cost of a link can be modified in the interface configuration mode. The process ID is local to the router. -
Question 5 of 34
5. Question
1 pointsRefer to the exhibit. When OSPF is operational and converged, what neighbor relationship is developed between router R1 and router R2?Correct
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Hint
When OSPF is operational and converged, a full adjacency is formed between routers. -
Question 6 of 34
6. Question
1 pointsRefer to the exhibit. What destination address will RTB use to advertise LSAs?Correct
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Hint
A DR and BDR are elected on multiaccess networks to reduce the number of OSPF adjacencies formed. Non-DR routers will form adjacencies with the DR and BDR and send LSU packets to the AllDR-Routers multicast address of 224.0.0.6 -
Question 7 of 34
7. Question
1 pointsA network administrator is implementing OSPF in a portion of the network and must ensure that only specific routes are advertised via OSPF. Which network statement would configure the OSPF process for networks 192.168.4.0, 192.168.5.0, 192.168.6.0, and 192.168.7.0, now located in the backbone area, and inject them into the OSPF domain?Correct
Incorrect
Hint
The network 192.168.4.0 0.0.3.255 area 0 command has the correct network and wildcard mask combination to capture the four networks and activate the associated interfaces for area 0. -
Question 8 of 34
8. Question
1 pointsAn administrator is configuring an OSPF router and would like the router to automatically advertise a default route into the OSPF domain even if there is no default route in the RIB. Which configuration will accomplish this?Correct
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Hint
To get an OSPF router to advertise a default route even if there is no default route in the RIB, use the default-information originate command with the always key word. -
Question 9 of 34
9. Question
1 pointsWhich two variables must match between two OSPF routers to form a neighbor adjacency? (Choose two.)Correct
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Hint
Several variables must match for an OSPF neighbor adjacency to be formed between two OSPF routers. These variables include: area ID, hello and dead timers, interface MTU, and interface subnet. -
Question 10 of 34
10. Question
1 pointsIn the planning stages for an OSPF deployment, which step can be taken to reduce router overhead by limiting the size of the link state databases, and LSA Type 1 and Type 2 propagation?Correct
Incorrect
Hint
As OSPF areas grow in size, the size of the LSDB grows and the number of type 1 and type 2 LSAs increases. Breaking an OSPF domain into multiple areas reduces the size of the LSDB and the number type 1 and 2 LSAs in each area. -
Question 11 of 34
11. Question
1 pointsQuestion as presented: Match the OSPF LSA types to their descriptions. (Not all options are used.)Correct
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Hint
OSPF uses link-state advertisement messages (LSAs) to build the LSDB and maintain routing tables. OSPF routers use LSA types 1 to 5 to describe the networks to which they are directly connected or networks which they learned from other routers. These networks can be located in other areas or can also be from non-OSPF networks. Some LSAs are used to identify an ASBR. Although most LSAs will be flooded across multiple areas, some LSAs are flooded only within the area where they originated. -
Question 12 of 34
12. Question
1 pointsWhich two statements describe OSPF route summarization? (Choose two.)Correct
Incorrect
Hint
When OSPF summary routes are being configured, the metric of the summary route is equal to the lowest cost network within the summary address range. The area 51 range 172.0.0.0 255.0.0.0 command identifies area 51 as the area that contains the range of networks, 172.0.0.0. through 172.255.255.254 to be summarized. -
Question 13 of 34
13. Question
1 pointsWhat feature can be configured to filter routes as they are crossing an OSPF ABR?Correct
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Hint
A prefix list configured on an ABR can be used to filter routes as advertised into or out of an area. -
Question 14 of 34
14. Question
1 pointsWhich LSA type is advertised by all OSPF routers?Correct
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Hint
Type 1, router link, LSAs are advertised by all OSPF routers. -
Question 15 of 34
15. Question
1 pointsRefer to the exhibit. What can be concluded about network 192.168.1.0 in the R2 routing table?Correct
Incorrect
Hint
In a routing table, the designation O IA means the entry was learned from an interarea LSA that was generated from an ABR. The C label indicates a network that is directly connected to an interface on the router. The O label indicates a network that is advertised by another router in the same area. The label O*E2 indicates an external network. In this case, the network designation of 0.0.0.0/0 indicates that this external network is the default route for all traffic that is destined for external networks. -
Question 16 of 34
16. Question
1 pointsWhat period of time must elapse before an LSA is purged from the local LSBD if not updated with a new LSA?Correct
Incorrect
Hint
If not updated with a new LSA, LSAs in the local LSDB will age out at 3600 seconds and be purged from the LSDB. -
Question 17 of 34
17. Question
1 pointsWhat action does an ABR take when it receives a type 1 LSA?Correct
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Hint
When an ABR receives a type 1 LSA, it creates a type 3 LSA that references the network in the original type 1 LSA and then advertises that type 3 LSA into other areas. -
Question 18 of 34
18. Question
1 pointsWhich LSA type is flooded by a designated router to other OSPF routers within the same area?Correct
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Hint
Type 2 LSAs are flooded by the DR to inform other OSPF routers about multiaccess networks within an area. -
Question 19 of 34
19. Question
1 pointsWhat does an OSPF area contain?Correct
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Hint
An OSPF area contains one set of link-state information, although each router within the area will process that information individually to form its own SPF tree. OSPF process IDs are locally significant and are created by the administrator. Router IDs uniquely identify each router. -
Question 20 of 34
20. Question
1 pointsThe network administrator has been asked to summarize the routes for a new OSPF area. The networks to be summarized are 172.16.8.0, 172.16.10.0, and 172.16.12.0 with subnet masks of 255.255.255.0 for each network. Which command should the administrator use to forward the summary route for area 15 into area 0?Correct
Incorrect
Hint
Because all OSPF networks start with area 0, the new area would need to be anything but area 0, The correct option would be area 15 range 172.16.8.0 255.255.248.0 because this is the correct summarization of the networks in the new area 15. The summarization must come from area 15 to area 0, because all OSPF areas interconnect via area 0. The matching bits for the correct option, in binary, are:- 172.16.8.0 10101100.00010000.00001 000.00000000
- 172.16.10.0 10101100.00010000.00001 010.00000000
- 172.16.12.0 10101100.00010000.00001 100.00000000
-
Question 21 of 34
21. Question
1 pointsWhich statement is true about the difference between OSPFv2 and OSPFv3?Correct
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Hint
Because OSPFv3 routers form neighbor adjacencies by using the link-local address of the interface, they are not required to have global addresses configured on the interfaces. Even if they do have global addresses configured, the addresses do not have to be in the same subnet on each end of the link. -
Question 22 of 34
22. Question
1 pointsWhich two OSPFv3 LSAs advertise address prefix information? (Choose two.)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 23 of 34
23. Question
1 pointsWhich statement describes the OSPFv3 configuration process?Correct
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Hint
Before the OSPFv3 process will start, IPv6 routing must be enabled with the ipv6 unicast-routing command. -
Question 24 of 34
24. Question
1 pointsWhat IPv6 address does an OSPFv3 router use as the destination address when sending hello packets to discover neighbors?Correct
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Hint
OSPFv3 Hello packets for discovering neighbors are sent to the all OSPFv3 router address FF02::5. -
Question 25 of 34
25. Question
1 pointsWhich is a difference between OSPFv2 and OSPFv3?Correct
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Hint
OSPFv2 has built in support for neighbor authentication which OSPFv3 does not. OSPFv3 relies on IPsec for neighbor authentication. -
Question 26 of 34
26. Question
1 pointsHow are OSPFv3 routes that are learned from type 1 LSAs identified in the IPv6 routing table?Correct
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Hint
OSPFv3 uses the code O to identify intrarea routes learned from type 1 LSAs in the routing table. -
Question 27 of 34
27. Question
1 pointsA network administrator enters the command ipv6 router ospf 64 in global configuration mode. What is the result of this command?Correct
Incorrect
Hint
The basic command to implement OSPFv3 on a router uses the same process-id parameter as OSPFv2 to assign a locally-significant number to the OSPF process. OSPF does not use autonomous system numbers. Following the assignment of the process ID, a prompt will direct the user to manually assign a router ID. After the router ID is assigned, the reference bandwidth can be set. -
Question 28 of 34
28. Question
1 pointsWhat benefit is provided to OSPFv3 with the two new LSA types, type 8 and type 9?Correct
Incorrect
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 29 of 34
29. Question
1 pointsRefer to the exhibit. What two addresses will OSPFv3 neighbors connected to the g0/1 interface of R2 use as the destination address for sending OSPFv3 link-state updates to R2?Correct
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Hint
Router R2 is a DR. Other OSPFv3 routers form an adjacency with the DR and send link-state updates to the ALLDRouters multicast ff02:06 and to the link -local address of the DR, which for g0/1 on R2 is fe80::2. -
Question 30 of 34
30. Question
1 pointsWhich type of LSA only exists on networks containing a DR?Correct
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Hint
A network LSA (type 2) is generated by a DR to identify the routers attached to the network segment. -
Question 31 of 34
31. Question
1 pointsWhich type of LSAs are reduced through interarea summarization?Correct
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Hint
Interarea summarization reduces the number of type 3 LSAs advertised by an ABR. -
Question 32 of 34
32. Question
1 pointsAt what level does OSPF maintain a unique LSDB?Correct
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Hint
Each OSPF router maintains a link state database (LSDB) for each area it participates in. -
Question 33 of 34
33. Question
1 pointsRefer to the exhibit. Which address will R1 use as the source address for all OSPFv3 messages that will be sent to neighbors?Correct
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Hint
All OSPFv3 messages are sourced from the link-local IPv6 address of an interface. Link local addresses use the prefix FE80::/10. -
Question 34 of 34
34. 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.