Ccna certification Practice Tests

323

 100.  A.  The command to view the routing table is 

show ip route. The command show route 

is incorrect. The command 

show route table is incorrect. The command show routes 

is incorrect.

 101.  C.  The Address Resolution Protocol (ARP) is used by TCP/IP to resolve a MAC address 

from a known IP address. This in turn allows TCP/IP to packet switch from router to 

router by sending the packet to the next destination MAC address. The Internet Group 

Management Protocol (IGMP) is used in conjunction with multicast to join clients to a 

multicast group. The Reverse Address Resolution Protocol (RARP) is a legacy protocol 

that maps an IP address from a MAC address, similar to DHCP. The Internet Control 

Message Protocol (ICMP) is a layer 3 protocol that allows for end-to-end testing with a 

command such as traceroute.

 102. C. The 

ping command uses ICMP to check the status of a router. It also gives the round-

trip time of the packet. Simple Network Management Protocol (SNMP) traps are alerts 

sent from an SNMP agent to an SNMP collector when a specific event is triggered. SNMP 

trap notifications are messages that are sent to a network management station (NMS) and 

are defined with severity levels. The Address Resolution Protocol (ARP) helps map a MAC 

address to an IP address for the framing of data.

 103.  C.  When you’re using the 

ping command, the exclamation marks signify that the ping 

was successful and the router is responding. If the distant router is not responding, 

you will see periods. A high or low response time cannot be identified with the 

ping 

command.

 104.  B.  The correct command sequence is 

ip route followed by the network ID, the subnet 

mask, and then the gateway. In this case, the gateway is a serial line. The command 

ip route 192.168.4.0/24 serial 0/1 is incorrect. The command ip route 

192.168.4.0/24 interface serial 0/1 is incorrect. The command ip route 

Router(config-rtr)#192.168.4.0/24 serial 0/1 is incorrect.

 105.  B.  The command 

ip default-gateway allows the management plane of the router 

to egress the network the router is configured upon through a different gateway. The 

command of 

ip default-gateway is not used for dynamic routing; it is strictly used for 

the management traffic of the router. Although the specified gateway could be wrong, 

correcting it will not allow for the routing of data, only management traffic.

 106.  C.  Router A needs to be pointed to the adjacent router’s far IP address. Imagine a hall 

with two doors; one door leads to Network A and the other leads to Network B. To 

get to Network B, you need to get to the router’s IP interface (door). The command 

ip 

route 192.168.3.0 255.255.255.0 serial 0/1 is incorrect. The command ip route 

192.168.3.0 255.255.255.0 192.168.2.1 is incorrect. The command ip route 

192.168.3.0 255.255.255.0 192.168.3.1 is incorrect.

 107.  D.  When an IP address of 192.168.1.1/24 is configured, for example, the router will create 

a summary route for 192.168.1.0/24 as well as a route for 192.168.1.1/32. Both of these 

changes to the routing table will trigger an update depending on which dynamic routing 

protocol is being used.

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