CCNAv7 ENSA Module 1 - 2 Review

What is the default router priority value for all Cisco OSPF routers? 0 1 10 255

1

Refer to the exhibit. If no router ID was manually configured, what would router Branch1 use as its OSPF router ID? 10.0.0.1 10.1.0.1 192.168.1.100 209.165.201.1

192.168.1.100

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.

It is a link-state database that represents the network topology. When converged, all routers in an area have identical topology tables. The table can be viewed via the show ip ospf database command.

Which OPSF packet contains the different types of link-state advertisements? hello DBD LSR LSU LSAck

LSU

Refer 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.) R3 will be elected BDR. The R4 FastEthernet 0/0 priority is 128. The R4 router ID is 172.16.1.1. R1 will be elected BDR. The router ID on R2 is the loopback interface. R2 will be elected DR.

R3 will be elected BDR. The R4 router ID is 172.16.1.1 R2 will be elected DR

Refer to the exhibit. A network administrator has configured the OSPF timers to the values that are shown in the graphic. What is the result of having those manually configured timers? R1 automatically adjusts its own timers to match the R2 timers. The R1 dead timer expires between hello packets from R2. The hello timer on R2 expires every ten seconds. The neighbor adjacency has formed.

The R1 dead timer expires between hello packets from R2.

A network engineer has manually configured the hello interval to 15 seconds on an interface of a router that is running OSPFv2. By default, how will the dead interval on the interface be affected? The dead interval will not change from the default value. The dead interval will now be 30 seconds. The dead interval will now be 60 seconds. The dead interval will now be 15 seconds.

The dead interval will now be 60 seconds.

What will an OSPF router prefer to use first as a router ID? a loopback interface that is configured with the highest IP address on the router any IP address that is configured using the router-id command the highest active interface IP that is configured on the router the highest active interface that participates in the routing process because of a specifically configured network statement

any IP address that is configured using the router-id command

Which type of OSPFv2 packet contains an abbreviated list of the LSDB of a sending router and is used by receiving routers to check against the local LSDB? database description link-state update link-state request link-state acknowledgment

database description

To establish a neighbor adjacency two OSPF routers will exchange hello packets. Which two values in the hello packets must match on both routers? (Choose two.) dead interval router priority list of neighbors router ID hello interval

dead interval hello interval

When an OSPF network is converged and no network topology change has been detected by a router, how often will LSU packets be sent to neighboring routers? every 5 minutes every 10 minutes every 30 minutes every 60 minutes

every 30 minutes

Which step does an OSPF-enabled router take immediately after establishing an adjacency with another router? builds the topology table exchanges link-state advertisements chooses the best path executes the SPF algorithm

exchanges link-state advertisements

Which OSPF data structure is identical on all OSPF routers that share the same area? forwarding database link-state database adjacency database routing table

link-state database

An OSPF router has three directly connected networks; 172.16.0.0/16, 172.16.1.0/16, and 172.16.2.0/16. Which OSPF network command would advertise only the 172.16.1.0 network to neighbors? router(config-router)# network 172.16.1.0 0.0.255.255 area 0 router(config-router)# network 172.16.0.0 0.0.15.255 area 0 router(config-router)# network 172.16.1.0 255.255.255.0 area 0 router(config-router)# network 172.16.1.0 0.0.0.0 area 0

router(config-router)# network 172.16.1.0 255.255.255.0 area 0

What does an OSPF area contain? routers that share the same router ID routers whose SPF trees are identical routers that have the same link-state information in their LSDBs routers that share the same process ID

routers that have the same link-state information in their LSDBs

What is used to facilitate hierarchical routing in OSPF? the use of multiple areas frequent SPF calculations autosummarization the election of designated routers

the use of multiple areas

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

to discover neighbors and build adjacencies between them

What are the two purposes of an OSPF router ID? (Choose two.) to uniquely identify the router within the OSPF domain 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 to facilitate the establishment of network convergence to facilitate the transition of the OSPF neighbor state to Full

to uniquely identify the router within the OSPF domain to facilitate router participation in the election of the designated router

In an OSPF network when are DR and BDR elections required? when the two adjacent neighbors are interconnected over a point-to-point link when all the routers in an OSPF area cannot form adjacencies when the routers are interconnected over a common Ethernet network when the two adjacent neighbors are in two different networks

when the routers are interconnected over a common Ethernet network