Ccna certification Practice Tests

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Appendix 

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  Answers to Practice Test Questions

 203.  C.  The subnet mask is incorrect because it should be at least 8 bits starting with 255.0.0.0 

or a higher number of bits. The process ID would not affect the operation of OSPF. The 

area number will only affect a router if it is not participating with another bordering 

router or router within its area. The network ID is correct in this example, but the bitmask 

is incorrect.

 204.  A.  In order to form an adjacency, the area IDs must match as well as the hello and dead 

timers. If the hello timer is changed on one router, it must be changed on the other router 

to form an adjacency. Although the link is a point-to-point connection, the two routers 

will form an adjacency because it supports multicast/broadcasts. The process IDs do 

not need to match to form an adjacency. Areas are not configured with an IP address, 

therefore this is an incorrect answer.

 205.  A.  The FULL state is only achieved after the router has created an adjacency with 

a neighbor router and downloaded the LSAs to form its topological database. The 

EXSTART state means that the DR and BDR routers have been elected and are awaiting 

the exchange of link state information. The INIT state is the first step in the creation of an 

adjacency. The EXCHANGE state means that the exchange of the LSA information is in 

progress.

 206.  D.  Both routers have formed an adjacency. However, the LSDB on each router has not yet 

been fully synchronized. Once the LSDBs have been synchronized, the state will become 

FULL and OSPF will calculate costs. The exhibit does not detail any information to 

conclude that the neighbors are having problems forming an adjacency. The neighbor or 

router OSPF recalculation of cost would not show in the 

show ip ospf neighbor output.

 207.  C.  The command 

ip ospf cost 25 should be configured on the interface that will act 

as the backup route. This adjustment of cost will allow the router to prefer the other route 

first. The command 

ip ospf priority 25 is incorrect. The command ip ospf route 

primary is incorrect. The command passive interface gi 0/0 is incorrect.

 208.  D.  The router ID of 192.168.2.2 is neither a Designated Router (DR) nor a Backup 

Designated Router (BDR). Since it is neither, it will only form an adjacency with the DR or 

BDR and will participate in future elections. The exhibit does not show any evidence that 

the router is in the process of forming an adjacency since all of the states show FULL. The 

DROTHER state means that the router is not a designated router or backup designated 

router. It is participating in OSPF because it shows up in the neighbor table for OSPF.

 209.  B.  The command 

ip ospf priority 10 will change the interface’s default priority 

of 1 to 10. This router will always become the designated router (DR) on the LAN. 

The command 

ospf priority is incorrect. The command ip address 192.168.5.2 

255.255.255.0 is incorrect. The command ip ospf cost 15 is incorrect.

 210.  The command 

show ip ospf interface will display the interface details of each 

interface for OSPF. In this information, the DR and BDR router ID (RIDs) will be 

displayed. The command 

show ip ospf neighbor is incorrect. The command show ip 

ospf database is incorrect. The command show ip ospf dr is incorrect.

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Chapter 3: IP Connectivity (Domain 3)