200-301 · Question #219
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?
The correct answer is B. The phone sends and receives data in VLAN 50, but a workstation connected to the phone sends. When a Cisco IP phone is connected to a port configured with a voice VLAN, the phone itself will operate in the specified voice VLAN, while a workstation connected to the phone's pass-through port will operate in the access VLAN.
Question
Options
- AThe phone and a workstation that is connected to the phone do not have VLAN connectivity.
- BThe phone sends and receives data in VLAN 50, but a workstation connected to the phone sends
- CThe phone sends and receives data in VLAN 50, but a workstation connected to the phone has
- DThe phone and a workstation that is connected to the phone send and receive data in VLAN 50.
How the community answered
(50 responses)- A2% (1)
- B80% (40)
- C12% (6)
- D6% (3)
Why each option
When a Cisco IP phone is connected to a port configured with a voice VLAN, the phone itself will operate in the specified voice VLAN, while a workstation connected to the phone's pass-through port will operate in the access VLAN.
The configuration explicitly assigns VLANs, so connectivity will be established for both the phone and the workstation.
When a Cisco IP phone is connected to a switch port configured with the `switchport voice vlan 50` command, the switch uses CDP/LLDP-MED to detect the phone and assigns it to VLAN 50 for voice traffic. Simultaneously, the `switchport mode access` and `switchport access vlan 10` commands ensure that any device (like a workstation) subsequently connected to the phone's integrated switch port will be placed in the data VLAN (VLAN 10) for data traffic.
The workstation will receive data in the access VLAN (VLAN 10), not VLAN 50. VLAN 50 is specifically for the voice phone.
Only the phone will operate in VLAN 50. The workstation connected to the phone's PC port will operate in the access VLAN, which is VLAN 10.
Concept tested: Cisco Voice VLAN operation (data and voice separation)
Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3xe/multicast/configuration_guide/b_mult_3xe_3850_cg/b_mult_3xe_3850_cg_chapter_010.html
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