Refer to the exhibit. An administrator is tasked with configuring a voice VLAN. What is the expected outcome when a Cisco phone is connected to the GigabitEthernet 3/1/4 port on a switch?
A.
The phone and a workstation that is connected to the phone do not have VLAN connectivity.
B.
The phone sends and receives data in VLAN 50, but a workstation connected to the phone sends and receives data in VLAN 1.
C.
The phone sends and receives data in VLAN 50, but a workstation connected to the phone has no VLAN connectivity.
D.
The phone and a workstation that is connected to the phone send and receive data in VLAN 50.
I think if we are talking about "tagging" we have to mention a TRUNK, tagging has no use in an isolated switched, the switch simply separates ports in different vlans, and each one with a separate MAC address table. Think about .1q tagging as a tool for giving information about an internal switch vlan to another switch.
If you don't configure explicitely a command "switchport mode access vlan x", and the port is not a trunk port, hence an Access Port (like in this example), the default data VLAN will be 1.
That's a good point. B is right. Since the native VLAN is not referenced, we can safely assume it is VLAN1 (native defaulting to the default VLAN if not configured) and the untagged data PC traffic passes through the phone unchanged. If the data traffic was tagged, we would likely have more details here such as cos value or trust with the switchport priority.
https://www.cisco.com/c/en/us/support/docs/smb/collaboration-endpoints/cisco-ip-phone-7800-series/smb5625-configure-ethernet-settings-on-a-cisco-ip-phone-7800-or-8800.html#:~:text=0%20to%204095.-,The%20default%20is%20VLAN%201,-.
https://www.youtube.com/watch?v=zW_-mf6v3fs
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3560/software/release/12-2_52_se/configuration/guide/3560scg/swvoip.html#:~:text=To%20process%20tagged%20data%20traffic%20(in%20IEEE%20802.1Q%20or%20IEEE%20802.1p%20frames)%2C%20you%20can%20configure%20the%20switch%20to%20send%20CDP%20packets%20to%20instruct%20the%20phone%20how%20to%20send%20data%20packets%20from%20the%20device%20attached%20to%20the%20access%20port%20on%20the%20Cisco%20IP%20Phone
Ref: Voice VLAN - NetworkLessons.com
“...
The computer will be in a data VLAN, the IP phone will be in the voice VLAN.
...
Behind the scenes, we have a trunk between our switch and IP phone. The port on the IP phone that connects to the computer is an access port. The IP phone will forward all traffic from the computer to the switch untagged, traffic from the IP phone itself will be tagged. The only two VLANs that are allowed though, are the access and voice VLAN.
...”
A. The phone and a workstation that is connected to the phone do not have VLAN connectivity.
Wrong answer.
B. The phone sends and receives data in VLAN 50, but a workstation connected to the phone sends and receives data in VLAN 1.
Correct answer.
C. The phone sends and receives data in VLAN 50, but a workstation connected to the phone has no VLAN connectivity.
Wrong answer.
D. The phone and a workstation that is connected to the phone send and receive data in VLAN 50.
Wrong answer.
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