CCNA 2 v5.02 RSE Chapter 8 Exam Answers

1. Which OSPF component is identical in all routers in an OSPF area after convergence?

adjacency database

link-state database*

routing table

SPF tree


2. Which three statements describe features of the OSPF topology table? (Choose three.

It is a link-state database that represents the network topology.*

Its contents are the result of running the SPF algorithm.

When converged, all routers in an area have identical topology tables.*

The topology table contains feasible successor routes.

The table can be viewed via the show ip ospf database command.*

After convergence, the table only contains the lowest cost route entries for all known networks.


3. What is a function of OSPF hello packets?

to send specifically requested link-state records

to discover neighbors and build adjacencies between them*

to ensure database synchronization between routers

to request specific link-state records from neighbor routers


4. Which OPSF packet contains the different types of link-state advertisements?







5. A router is participating in an OSPFv2 domain. What will always happen if the dead interval expires before the router receives a hello packet from an adjacent DROTHER OSPF router?

OSPF will run a new DR/BDR election.

SPF will run and determine which neighbor router is “down”.

A new dead interval timer of 4 times the hello interval will start.

OSPF will remove that neighbor from the router link-state database.*


6. What are the two purposes of an OSPF router ID? (Choose two.)

to facilitate the establishment of network convergence

to uniquely identify the router within the OSPF domain*

to facilitate the transition of the OSPF neighbor state to Full

to facilitate router participation in the election of the designated router*

to enable the SPF algorithm to determine the lowest cost path

to remote networks


7. Which criterion is preferred by the router to choose a router ID?

the IP address of the highest configured loopback interface on the router

the IP address of the highest active interface on the router

the router-id rid command*

the IP address of the highest active OSPF-enabled interface


8. Which wildcard mask would be used to advertise the network as part of an OSPF configuration?*


9. Which command should be used to check the OSPF process ID, the router ID, networks the router is advertising, the neighbors the router is receiving updates from, and the default administrative distance?

show ip protocols*

show ip ospf neighbor

show ip ospf

show ip ospf interface


10. Which OSPFv3 function works differently from OSPFv2?

metric calculation

hello mechanism

OSPF packet types


election process


11. Which three statements describe the similarities between OSPFv2 and OSPFv3? (Choose three.)

They both are link-state protocols.*

They both use the global address as the source address when sending OSPF messages.

They both share the concept of multiple areas.*

They both support IPsec for authentication.

They both use the same DR/BDR election process.*

They both have unicast routing enabled by default.


12. What does a Cisco router use automatically to create link-local addresses on serial interfaces when OSPFv3 is implemented?

the highest MAC address available on the router, the FE80::/10 prefix, and the EUI-48 process

the FE80::/10 prefix and the EUI-48 process

the MAC address of the serial interface, the FE80::/10 prefix, and the EUI-64 process

an Ethernet interface MAC address available on the router, the FE80::/10 prefix, and the EUI-64 process*


13. A network administrator enters the command ipv6 router ospf 64 in global configuration mode. What is the result of this command?

The router will be assigned an autonomous system number of 64.

The router will be assigned a router ID of 64.

The reference bandwidth will be set to 64 Mb/s.

The OSPFv3 process will be assigned an ID of 64.*


14. When a network engineer is configuring OSPFv3 on a router, which command would the engineer issue immediately before configuring the router ID?

ipv6 ospf 10 area 0

ipv6 router ospf 10*

interface serial 0/0/1

clear ipv6 ospf process


15. Single area OSPFv3 has been enabled on a router via the ipv6 router ospf 20 command. Which command will enable this OSPFv3 process on an interface of that router?

ipv6 ospf 0 area 0

ipv6 ospf 20 area 20

ipv6 ospf 0 area 20

ipv6 ospf 20 area 0*


16. Which command will verify that a router that is running OSPFv3 has formed an adjacency with other routers in its OSPF area?

show running-configuration

show ipv6 ospf neighbor*

show ipv6 route ospf

show ipv6 interface brief


17. Which command will provide information specific to OSPFv3 routes in the routing table?

show ip route ospf

show ip route

show ipv6 route

show ipv6 route ospf*


18. Fill in the blank.

The election of a DR and a BDR takes place on _multiaccess_ networks, such as Ethernet networks.


19. Fill in the blank.

OSPF uses __cost__  as a metric.


20. Fill in the blank. Do not use abbreviations.

To quickly verify OSPFv3 configuration information including the OSPF process ID, the router ID, and the interfaces enabled for OSPFv3, you need to issue the command _show ipv6 protocols _ .


21. Match the information to the command that is used to obtain the information. (Not all options are used.)

Place the options in the following order:

Neighbor ID of -> show ip ospf neighbor
– not scored –
Routing Process “ospf 10” with ID -> show ip ospf
Routing Protocol is “ospf 10”  -> show ip protocols
BW 1544 Kbit/sec -> show interface serial 0/0/0


22. By order of precedence, match the selection of router ID for an OSPF-enabled router to the possible router ID options. (Not all options are used.)

Place the options in the following order:

Third precedence -> Loopback interface address
Fourth precedence -> Serial interface address
– not scored –
First precedence -> Configured router ID
Second precedence -> loopback interface IP address


23. Match the description to the term. (Not all options are used.)

Place the options in the following order:

This is where the details of the neighboring routers can be found. -> adjacency database
This is the algorithm used by OSPF.  -> Shortest Path First
All the routers are in the backbone area.  -> Single-area OSPF
– not scored –
This is where you can find the topology table.  -> link-state database
– not scored –



Open the PT Activity. Perform the tasks in the activity instructions and then complete the task.

What message is displayed on