Which option describes the effect of using softphones instead of VoIP handsets on QoS implementation for the voice traffic?

Question

Options

• AIt provides a Layer 2 CoS marking in the frames that can be used for QoS implementation.
• BUsing softphones means that 802.1Q tagging must be configured between the PC and the switch.
• CThe voice traffic of softphones is mixed with data traffic of PC on the access VLAN.
• DBy using softphones, the implementation of a QoS depends only on trusting DSCP markings set

• A
  6% (3)
• B
  8% (4)
• C
  82% (41)
• D
  4% (2)

Explanation

The key difference is that a dedicated VoIP handset connects directly to the switch and can be placed in a separate voice VLAN (auxiliary VLAN), keeping voice traffic isolated from data traffic. A softphone is a software application running on the user's PC. Because it uses the PC's single network interface, voice traffic generated by the softphone is co-mingled with all other PC data traffic on the same access VLAN. This makes it significantly harder to apply QoS policies, as you cannot simply assign a voice VLAN to separate the streams at Layer 2. Choice A is incorrect because softphones do not add 802.1Q CoS tags. Choice B is incorrect because 802.1Q tagging is not required for softphones. Choice D is incorrect because DSCP trust alone is insufficient to fully solve the co-mingling problem.

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