Ccna certification Practice Tests

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Appendix 

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  Answers to Practice Test Questions

 63.  A.  You must first set the encapsulation to 802.1Q, then you can statically set the mode 

to trunk. An alternative would be to set the port to dynamic desirable via the command 

switchport mode dynamic desirable. However, it is recommended to statically 

configure the link to trunk on one or both sides if possible. Configuring both sides with 

switchport mode dynamic auto will result in the negotiation of an access link. Turning 

DTP off by using the command 

switchport nonegotiate will result in an access link. 

The correct command to set encapsulation is 

switchport trunk encapsulation dot1q, 

not 

switchport encapsulation dot1q.

 64.  C.  Native VLANs are only used for traffic that is not tagged, in which untagged frames 

are placed on a trunk link. A common use for native VLANs is management traffic 

between switches, before both sides are configured as a trunk. Traffic that is tagged will 

traverse the trunk link and not use the native VLAN. Native VLANs are not used for 

disallowed VLANs on a trunk link. Any traffic that is tagged with ISL on an 802.1Q 

trunk will not be distinguishable on either side since the frame will be mismatched.

 65.  D.  The switch is set up with a VTP mode of transparent. When a switch is set up with a 

mode of transparent, the VLAN information is stored in the running-config in lieu of the 

vlan.dat file. This is not the default mode of a switch;, out of the box it is configured 

as a VTP server. The switch is not set up as a VTP client or server since the VLAN 

configuration is visible in the running-config.

 66.  B.  If you issue the command 

switchport nonegotiate, the switch will not send 

Dynamic Trunking Protocol (DTP) frames for trunk negotiation. The default 

configuration for a port is the mode of access, so the port will remain an access port. This 

means the switch port will not transition to a trunk port, and it will remain an access 

port. The interface will not shut down, but it will be mismatched and not carry any tagged 

VLANs. The switch port will not enter an err-disable state.

 67.  A.  Switch A must change its interface to an access port with the 

switchport mode 

access command, which will force Switch A’s interface to remain an access port. Then 

you configure the access VLAN of 5 on Switch A with the 

switchport access vlan 5 

command. Configuring the port with the mode of a trunk on either switch will prevent the 

port from performing as an access port for VLAN 5. If you tried to configure this with a 

native VLAN, it would result in a native VLAN mismatch and improper configuration.

 68.  D.  The command 

switchport mode dynamic desirable is similar to switchport 

mode dynamic auto with the exception that it is desirable to become a trunk. So if the 

neighboring port is set to auto, desirable, or trunk, it becomes a trunk.

 69.  A.  The command 

switchport mode dynamic auto will cause the port to remain an 

access port if the neighboring port is configured the same. If both sides are configured 

with 

switchport mode dynamic auto, then the port will become an access link. If you 

configure the neighboring port as a trunk, it will become a trunk. If the native VLAN is 

changed, it will have no effect over the selection of switch port mode.

 70.  C.  The command 

show interfaces switchport will show greater detail about the 

trunk than the command 

show interfaces trunk. Alternatively, you can specify a 

single port using the command 

show interfaces Fa 0/5 switchport, for example. 

The command 

show interfaces trunk detail is not similar. The command show 

switchport is not similar. The command show running-config is not similar.

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Chapter 2: Network Access (Domain 2)