Ccna certification Practice Tests

286

 

Appendix 

■

  Answers to Practice Test Questions

 16.  C.  The correct command is 

switchport access vlan 9. This command entered into 

the interface configuration prompt for the respective interface will place that interface in 

VLAN 9. When you’re configuring an interface for a VLAN, only the VLAN number can 

be used; therefore, the commands 

switchport vlan research and switchport access 

vlan research are incorrect. The command switchport vlan 9 is incorrect.

 17. A. The 

switchport voice vlan 4 command will configure the interface to switch 

traffic with a CoS value of 5 (set by the phone) to the voice VLAN of 4. The command 

switchport vlan voice 4 is incorrect. The command switchport voip vlan 4 is 

incorrect. The command 

switchport access vlan 4 voice is incorrect.

 18.  A.  All VLAN tagging is removed from the frame before it egresses an access port to the 

end device. Trunk ports carry the VLAN tagging from end to end. Voice ports tag packets 

only when the CoS value is modified from the default. Native ports are used when frames 

arrive on a trunk and do not contain any tagging information.

 19.  C.  The client computer connected to an access port cannot see any VLAN tagging 

information. It is removed before the frame egresses the interface. An access port cannot 

carry VLAN tagging information because it is stripped. The client computer cannot 

request the VLAN that it wants to operate in. The administrator must manually configure 

the VLAN. A client computer cannot see the VLAN tagging information because it is 

stripped out as it egresses an access port.

 20.  C.  The command used to configure an access port for VLAN 8 is 

switchport access 

vlan 8, and the command to configure the VOIP phone is switchport voice vlan 

6. The command combination of switchport vlan 8 and switchport vlan 6 voip 

is incorrect. The command combination of 

switchport mode access vlan 8 and 

switchport voice vlan 6 is incorrect. The command switchport access vlan 8 

voice 6 is incorrect.

 21.  D.  The port is set up as a trunk. The phone is not misconfigured since the phone is 

normally configured for 801.Q tagging of CoS values, and it will work for this example. 

The computer is also not misconfigured; computers normally do not tag traffic for data. In 

this example, the communications will be directed to the native VLAN on the configured 

trunk. Configuring the command 

switchport nonegotiate will only prevent the port 

from participating in Dynamic Trunking Protocol (DTP), but either way, the port will 

remain a trunk because it is manually configured as one.

 22.  A.  When you are configuring port security on an interface, the switch port should have 

a mode of access configured. This will also protect the switch from transitioning into 

a trunk if another switch is connected. There is no such mode as dynamic mode. If the 

interface is configured in trunk mode, port security will not be effective since many 

different MAC addresses can traverse the link. Voice mode is not a mode; it is a function 

of an access port that tags traffic when a CoS value is detected.

 23.  D.  All switches are configured by default with all interfaces in VLAN 1. This simplifies 

configuration if the switch is to be used as a direct replacement for a hub since nothing 

needs to be configured. All of the other options are incorrect.

---

Chapter 2: Network Access (Domain 2)