200-301 Question 174
Select 3A network administrator is configuring a switch port to support an IP phone and a computer connected to it via the phone's pass-through port. The administrator wants to ensure that voice traffic is prioritized while the computer traffic remains on the default VLAN. Which of the following configurations should be applied to the switch port?
- A
Configure the port as an access port and assign it to the default VLAN for data traffic.
- B
Enable the Voice VLAN feature on the port and specify a VLAN ID for voice traffic.
- C
Set the port to trunk mode to allow both data and voice traffic.
- D
Configure Quality of Service (QoS) on the port to prioritize voice traffic.
- E
Disable spanning-tree protocol on the port to prevent loops caused by the IP phone.
Show answer and explanation
Correct answers: A, B, D
Explanation
To support an IP phone and a computer on the same physical switch port, the port should be configured as an access port for the computer's data traffic to remain on the default VLAN. The Voice VLAN feature should also be enabled with a specific VLAN ID to segregate and prioritize voice traffic. Additionally, QoS should be enabled to ensure voice traffic receives higher priority. Trunk mode is not required for this setup, and spanning-tree protocol should not be disabled as it serves a different purpose.
- A. Correct.
This is a correct option because the port must function as an access port for the computer's data traffic to remain on the default VLAN.
- B. Correct.
This is a correct option because enabling the Voice VLAN feature and assigning a VLAN ID ensures that voice traffic is segregated and prioritized.
- C. Incorrect.
This is incorrect because trunk mode is not typically used for connecting end devices like an IP phone or computer. Access ports are generally used in this scenario.
- D. Correct.
This is a correct option because enabling QoS helps prioritize time-sensitive voice traffic over less critical data traffic.
- E. Incorrect.
This is incorrect because disabling spanning-tree protocol is not related to voice or data VLAN configuration and could lead to network loops.