Cisco CCNA VLANs and 802.1Q Trunking 5

Question 1

Which command is used to verify which VLANs are forwarding on a specific trunk interface?

Accepted Answer

show interfaces trunk

Answer

`show interfaces trunk` shows active VLANs in STP forwarding state on each trunk port.

Question 2

A voice VLAN is configured on an access port with `switchport voice vlan 50`. How does the switch handle voice traffic on that port?

Accepted Answer

Voice traffic is tagged with VLAN 50 and data traffic remains untagged on the access VLAN

Answer

With a voice VLAN configured, the IP phone sends tagged voice frames on VLAN 50 while the PC behind it sends untagged data on the access VLAN.

Question 3

What happens when you delete vlan.dat from the switch's flash memory?

Accepted Answer

All normal-range VLAN configurations are erased and reset to defaults

Answer

Deleting vlan.dat removes all normal-range VLAN definitions, resetting the switch to factory VLAN defaults on next boot.

Question 4

Which of the following is a reserved VLAN that cannot be deleted or used for data traffic on Cisco switches?

Accepted Answer

VLAN 1002

Answer

VLANs 1002–1005 are reserved for legacy Token Ring and FDDI protocols and cannot be deleted or modified.

Question 5

On a Layer 3 switch, what is required for inter-VLAN routing using Switched Virtual Interfaces (SVIs)?

Accepted Answer

An SVI must be created for each VLAN and IP routing must be enabled

Answer

Inter-VLAN routing via SVIs requires creating a VLAN interface (SVI) for each VLAN and enabling `ip routing` on the Layer 3 switch.

Cisco CCNA Practice Test