On a cisco catalyst switch, which command is required to send CDP packets on a switch port that configures a cisco IP phone to transmit voice traffic in 802.1q frames tagged with the voice VLAN ID…

The correct answer is D. Device(config-if)# switchport voice vlan 221. The command switchport voice vlan 221 is the correct interface-level command that accomplishes two things: it designates VLAN 221 as the voice VLAN on that port, and it causes the switch to send CDP (Cisco Discovery Protocol) packets to the connected Cisco IP phone. The IP…

Protocols and Endpoints

Question

On a cisco catalyst switch, which command is required to send CDP packets on a switch port that configures a cisco IP phone to transmit voice traffic in 802.1q frames tagged with the voice VLAN ID 221?

Options

ADevice(config-if)# switchport access vlan 221
BDevice(config-if)# switchport trunk allowed vlan 221
CDevice(config-if)# switchport vlan voice 221
DDevice(config-if)# switchport voice vlan 221

How the community answered

(49 responses)

A
2% (1)
B
4% (2)
C
4% (2)
D
90% (44)

Explanation

The command switchport voice vlan 221 is the correct interface-level command that accomplishes two things: it designates VLAN 221 as the voice VLAN on that port, and it causes the switch to send CDP (Cisco Discovery Protocol) packets to the connected Cisco IP phone. The IP phone reads the CDP message and learns to tag its voice traffic with 802.1Q VLAN ID 221, while passing data traffic untagged on the access VLAN. switchport access vlan 221 (Choice A) sets the data/PC VLAN, not the voice VLAN. switchport trunk allowed vlan 221 (Choice B) is a trunk configuration command. switchport vlan voice 221 (Choice C) is not a valid Cisco IOS command syntax.

Topics

#Voice VLAN#CDP#Switchport configuration#IP Phone

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