Ccna certification Practice Tests

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Appendix 

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  Answers to Practice Test Questions

 24.  D.  The command 

switchport trunk allowed vlan 12 will remove all other VLANs 

and only VLAN 12 will be allowed on the trunk interface. The proper command to 

add an additional VLAN would be 

switchport trunk allowed vlan add 12. This 

command will add a VLAN to the already established list. All of the other options are 

incorrect.

 25.  D.  The VLAN Trunking Protocol (VTP) assists in synchronizing a VLAN database across 

all Cisco switches participating in VTP. You must initially configure the VTP domain on 

the switch that will hold the master database. Then all other switches must be configured 

as clients and the VTP domain must be configured as well. The Network Time Protocol 

(NTP) synchronizes time on the switch or router with a known precision source. The 

Internet Group Management Protocol (IGMP) is used to facilitate multicast snooping on 

switches by allowing join and leave requests for the multicast group. The Inter-Switch 

Link (ISL) protocol is a Cisco proprietary protocol for VLAN trunking.

 26.  C.  The two switches have a duplex mismatch. The duplex mismatch is a direct result of 

statically configuring only one side of the link to full-duplex. Switch A is not participating 

in port negotiation. Both sides must be configured statically the same or set to auto. There 

is no evidence of a wiring fault from the exhibit. There is also no evidence that interface 

Gi1/1 is operating nominally from the exhibit. The two switches could not have a VLAN 

mismatch because they are both configured as trunk links.

 27.  D.  The device has the capability of both a switch and a router. It is most likely a switch 

that is performing SVI routing or has routing enabled. If the capability showed a B, 

the device would have source route bridge capabilities. If either S or R showed as a 

capability by itself, it would mean the device had switch capability or route capability, 

respectively.

 28.  C.  The command 

show cdp neighbors detail will display all connected switches along 

with their IP addresses, hostnames, and IOS version. If this command is used from the 

central switch, you can quickly assess which switches need to be upgraded. The command 

show version is incorrect. The command show running-config is incorrect. The 

command 

show lldp neighbors is incorrect.

 29.  A.  When one side is configured with on mode, it uses no control protocol. If a control 

protocol is sensed from the adjacent switch, the port will enter err-disabled mode 

to protect it from a loop. If one switch was configured with the auto mode and the 

other switch was configured with desirable mode, a Port Aggregation Protocol (PAgP) 

EtherChannel link would be formed. If both switches were configured with active mode, 

then a Link Aggregation Control Protocol (LACP) EtherChannel would be formed. 

When both switches are configured with passive mode, then LACP would not form an 

EtherChannel.

 30.  C.  When you configure the 

channel-group 1 mode active command on the first 

interface, a pseudo interface is created called 

port-channel 1. All statistics and 

configuration should be referenced by this interface. All of the other options  

are incorrect.

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Chapter 8: Practice Exam 2