CCNA (V.31) Semester-3- Question - Answers- Paper 2 Part -1

CCNA (V.31) Semester-3- Question - Answers- Paper 2 Part -1
1.What does OSPF use to calculate the cost to a destination network?

bandwidth *

bandwidth and hop count

bandwidth and reliability

bandwidth, load, and reliablity



2.A network administrator has configured a default route on Router_A but it is not being shared with adjacent Router_B and the other routers in the OSPF area. Which command will save the administrator the time and trouble of configuring this default route on Router_B and all of the other routers in the OSPF area?

Router_A(config-router)# ospf redistribute default-route

Router_B(config-router)# ospf redistribute default-route

Router_A(config-router)# default-information originate *

Router_B(config-router)# default-information originate

Router_A(config-router)# ip ospf update-default

Router_B(config-router)# ip ospf update-default

3.What are the benefits of the hierarchical design approach that is used in large OSPF networks? (Choose three.)

reduction of routing overhead *

increased routing overhead

faster convergence*

slower convergence

distribution of network instability to all areas of the network

isolation of network instability to one area of the network*


4
Which of the following are required when adding a network to the OSPF routing process configuration? (Choose three.)

network address*

loopback address

autonomous system number

subnet mask

wildcard mask*

area ID*


5.Because of security concerns, a network administrator wants to set up authentication between two routers. Which of the following commands will configure Router_A to trust Router_B with a clear text password of apollo?

Router_A(config-if)# ospf authentication-key apollo

Router_A(config-if)# ip authentication-key apollo

Router_A(config-if)# ip ospf authentication apollo

Router_A(config-if)# ip ospf authentication-key apollo*




6.The routers in the diagram are configured as shown. The loopback interface on router R1 is labeled as lo0. All OSPF priorities are set to the default except for Ethernet0 of router R2, which has an OSPF priority of 2. What will be the result of the OSPF DR/BDR elections on the 192.1.1.0 network? (Choose two.)

R1 will be the DR

R1 will be the BDR

R2 will be the DR*

R2 will be the BDR

R3 will be the DR

R3 will be the BDR*


7.What information can be obtained from the output of the show ip ospf interface command? (Choose three.)

link-state age intervals

timer intervals*

router ID number*

link-state update intervals

neighbor adjacencies*




8.Which command sequence will enable OSPF in the backbone area for the two Ethernet links on RouterA?

RouterA(config)# router ospf 1
RouterA(config-router)# network 172.16.4.0 0.0.1.255 area 1

RouterA(config)# router ospf 10*
RouterA(config-router)# network 172.16.4.0 0.0.0.255 area 0
RouterA(config-router)# network 172.16.5.0 0.0.0.255 area 0

RouterA(config)# router ospf 10
RouterA(config-router)# area 0 network 172.16.4.0 0.0.1.255

RouterA(config)# router ospf 0
RouterA(config-route)# network 172.16.4.0 0.0.255.255 area 0

RouterA(config)# router ospf 0
RouterA(config-router)# network 172.16.4.0 255.255.255.0
RouterA(config-router)# network 172.16.5.0 255.255.255.0

RouterA(config)# router ospf 1
RouterA(config-router)# network 172.16.4.0 255.255.254.0 area 0



9.Which of the following are disadvantages of link-state routing? (Choose three.)

Link-state protocols require careful network design.*

Link-state protocols are prone to routing loops.

Link-state hello updates can cause broadcast flooding.

Link-state protocols place significant demands on router processors and memory resources.

Link-state protocols require a knowledgeable network administrator.*

Link-state protocols do not support Variable Length Subnet Masking.*


10.What does OSPF use to reduce the number of exchanges of routing information in networks where large numbers of neighbors are present? (Choose two.)

root router

backup root router

domain router

backup domain router

designated router*

backup designated router*


11.What speeds up convergence in a network using link-state routing?

updates triggered by network changes *

updates sent at regular intervals

updates sent only to directly connected neighbors

updates that include complete routing tables


12.Why is it difficult for routing loops to occur in networks that use link-state routing?

Each router builds a simple view of the network based on hop count.

Routers flood the network with LSAs to discover routing loops.

Each router builds a complete and synchronized view of the network.*

Routers use hold-down timers to prevent routing loops.


13.What will be the result of the DR and BDR elections for this single area OSPF network? (Choose three.)

HQ will be DR for 10.4.0.0/16.

Router A will be DR for 10.4.0.0/16.*

HQ will be BDR for 10.4.0.0/16.*

Router A will be DR for 10.5.0.0/16.

Remote will be DR for 10.5.0.0/16.*

Remote will be BDR for 10.5.0.0/16.

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