Ccna certification Practice Tests

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Appendix 

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  Answers to Practice Test Questions

 91.  B.  The command 

show ip rip database will display all of the discovered routes and 

their calculated metrics. The command 

show ip protocols rip is incorrect. The 

command 

show ip interface is incorrect. The command show ip rip topology is 

incorrect.

 92.  B.  The command 

show ip cef will display all of the network prefixes and the next hop 

that Cisco Express Forwarding (CEF) has in the forwarding information base (FIB). The 

command will also display the exit interface for the next hop. The command 

show cef is 

incorrect. The command 

show cef nop is incorrect. The command show cef route is 

incorrect.

 93.  A.  The destination MAC address changes on the layer 2 frame, leaving the layer 3 packet 

intact; this process is known as packet switching. The destination IP address will not 

change throughout the entire routing process. The source IP address will not change 

throughout the entire routing process, as the destination will need the source IP address 

to respond back to answer the request. The internal routes of the router(s) will not change 

based upon the routed packet.

 94.  C.  The router will drop the packet if no matching route is present. The router will not 

flood all active interfaces; only switches perform flooding in an attempt to discover the 

destination MAC address. Routers will not multicast the packet if no route is known. The 

router will not send the original packet back to the originating host; it will, however, send 

an ICMP destination network unreachable packet to the originating host.

 95.  D.  By default, directly connected routes are used automatically on routers to create routes 

in the route table. Default routing is a type of static routing, and it is not configured by 

default or automatically. Dynamic routing must be configured on routers, and therefore, it 

is not used automatically. Static routes must be configured on routers, and therefore, they 

are not used by default.

 96.  D.  When you configure routers, always use the rule of major/minor. The major  

protocol is IPv6 and the minor command is 

route. So the correct command is  

ipv6 route ::0/0 s0/0, specifying the ::0/0 s0/0 to mean everything out of the  

existing interface of s0/0. The command 

ip route 0.0.0.0/0 s0/0 is incorrect.  

The command 

ipv6 route 0.0.0.0/0 s0/0 is incorrect. The command  

ipv6 unicast-route ::0/0 s0/0 is incorrect.