Ccna certification Practice Tests

291

 55.  B.  The command 

vtp pruning in global configuration mode will enable VTP VLAN 

pruning. The command 

vtp mode pruning is an incorrect command. The command vtp 

vlan pruning is an incorrect command. The command enable pruning is an incorrect 

command when it is configured in a VLAN configuration prompt.

 56.  A.  VTP pruning needs to be configured only on the VTP server. The clients will receive 

the update and turn on VTP pruning automatically. If VTP pruning is turned on at the 

VTP client, the setting will be ignored since the client is a slave to the master server. If  

the VTP pruning is configured on a VTP transparent, the configuration will be ignored 

since VTP transparent switches do not participate in VTP with other switches. VTP 

pruning only needs to be configured on the VTP server; all clients will receive the 

necessary configuration from the VTP server.

 57.  B.  The VLAN is not allowed over the trunk because of the 

switchport trunk allowed 

vlan 4,6,12,15 command. The native VLAN is used when frames are not tagged, 

and the problem states that traffic in the same VLAN is not being forwarded. The 

trunk encapsulation is set to 802.1Q, which is the default for many switches. Also, if 

encapsulation was not set properly, no traffic would be forwarded. VTP is not required for 

switching operation, although it is helpful.

 58.  D.  The Dynamic Trunking Protocol can be turned off with the command 

switchport 

nonegotiate, which when configured states not to negotiate trunks via DTP. The 

command 

no dtp is incorrect. The command no switchport dtp enable is incorrect. 

The command 

switchport dtp disable is incorrect.

 59.  A.  Switch B will need to have its interface set to either 

switchport mode trunk 

or 

switchport mode dynamic desirable for Switch A to turn its interface into a 

trunk. The command 

switchport mode dynamic trunk is incorrect. The command 

switchport mode dynamic auto is incorrect. The command switchport nonegotiate 

is incorrect as it will never negotiate a trunking protocol.

 60.  D.  On Switch A, DTP is turned on and the encapsulation is set to 802.1Q. However, on 

Switch B, DTP is turned off and ISL encapsulation is manually set. Switch B will need to 

have 802.1Q configured in order to have trunking complete. Both Switch A and Switch 

B have their interfaces set to trunk mode already. DTP is running on Switch A, since the 

mode is set to auto in the exhibit. All VLANs do not need to be allowed first for trunking 

to happen.

 61.  A.  Inter-Switch Link, or ISL, is a proprietary protocol used for trunking of switches. 

If you need to connect non-Cisco switches to a Cisco switch, you must use 802.1Q, the 

IEEE standard. VTP is not a trunking protocol; it assists in populating VLANs across 

Cisco switches for conformity and ease of configuration. Cisco Discovery Protocol (CDP) 

is not a trunking protocol either; it negotiates power by communicating its capabilities 

with neighboring devices. It also allows for neighbor discovery, but CDP is proprietary to 

Cisco, so only Cisco devices can communicate.

 62.  C.  802.1Q inserts a field containing the 16-bit Tag Protocol ID of 0x8100, a 3-bit COS 

field, a 1-bit drop-eligible indicator (used with COS), and the 12=bit VLAN ID, which 

equals 32 bits, or 4 bytes. All of the other options are incorrect.

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