Ccna certification Practice Tests

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Appendix 

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  Answers to Practice Test Questions

 6.  B.  To route packets over the higher-speed link, you would need to configure a static 

route for both Router A and Router B. If these links went down, then the lower-speed 

link would become active. This is due to administrative distance. Configuring passive 

interfaces on Router A and Router B will only restrict the two routers from trading 

their route tables between each other. Setting the cost on the interface will not affect the 

routing with RIPv2. You cannot set the metric of 2 for each of the routers; it is an invalid 

command.

 7.  B.  Routing Information Protocol (RIP) does not contain a topology table. RIP compiles 

its table from multiple broadcasts or multicasts in the network from which it learns routes. 

However, it never has a full topological diagram of the network like OSPF, EIGRP, and 

BGP.

 8.  D.  The split horizon method prevents routing updates from exiting an interface in which 

they have been learned. This stops false information from propagating in the network, 

which can cause a routing loop. Routing to infinity is a way of advertising a downed route 

as unreachable because of the number of hops. Route poisoning is similar to routing to 

infinity as it advertises a downed route as over the routable hop count. Holddowns can 

help stabilize a network by holding off changes until a specific amount of time has passed.

 9.  B.  Although this is a static route, it is a very special static route called a default route 

or gateway of last resort. The 

S signifies that it is static and the * signifies that it is the 

default route. Most all default routes are static, but default routes can also be populated 

with dynamic routing protocols. The 

S signifies that the route is a static route; therefore, it 

cannot be populated with a dynamic routing protocol such as OSPF.

 10.  C.  The 4 represents the metric for this route statement. Since this is a RIP entry, the 

metric is the number of hops for this particular route. The administrative distance is 120 

in the exhibit. The protocol in the exhibit is RIP. The position in the routing table cannot 

be derived from a single statement in the routing table.

 11.  A.  The command 

show ip route 160.45.23.0 255.255.255.0 longer-prefixes 

will detail all of the specific routes contained in the route for 16.45.23.0/24. The 

command 

show ip route 160.45.23.0 255.255.255.0 will show the specific route 

of 160.45.23.0/24. The command 

show ip route bgp is not a valid command. The 

command 

show ip route will show the entire route table.

 12.  B.  The network of 192.168.1.0/24 is directly connected via Serial 0/0. The packet will be 

delivered out the exit interface of Serial 0/0. The administrative distance (AD) is the lowest 

on directly connected routes. The gateway address of 172.16.1.200 would only be valid if 

the example in the exhibit was only using OSPF. The gateway of 172.16.1.100 would only 

be valid if the example in the exhibit was only using RIP. The exit interface of Ethernet0 is 

valid for OSPF and RIP routing.

 13.  B.  The IP address of 203.80.53.22/19 belongs to the network of 203.80.32.0/19. No 

other answers are correct because they do not belong to the 203.80.32.0/19 network.

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Chapter 3: IP Connectivity (Domain 3)