350-801 · Question #188
An engineer is setting up a system with voice and video endpoints using auto-QoS policy on the switches. Which DSCP values are expected for interactive voice and video?
The correct answer is A. EF AND AF41. When using auto-QoS, interactive voice traffic is typically marked with DSCP EF (Expedited Forwarding), and interactive video traffic is marked with DSCP AF41 (Assured Forwarding Class 4, low drop precedence).
Question
An engineer is setting up a system with voice and video endpoints using auto-QoS policy on the switches. Which DSCP values are expected for interactive voice and video?
Options
- AEF AND AF41
- BEF AND AF21
- CEF AND CS3
- DEF AND CS6
How the community answered
(57 responses)- A93% (53)
- B4% (2)
- C2% (1)
- D2% (1)
Why each option
When using auto-QoS, interactive voice traffic is typically marked with DSCP EF (Expedited Forwarding), and interactive video traffic is marked with DSCP AF41 (Assured Forwarding Class 4, low drop precedence).
Cisco's Auto-QoS policies are designed to automatically apply recommended QoS settings. For interactive voice, EF (46) is the standard marking for delay-sensitive, low-jitter traffic, while AF41 (34) is recommended for interactive video, providing preferential treatment over other data traffic.
AF21 (20) is typically used for a lower priority class of assured forwarding, not the recommended marking for interactive video.
CS3 (24) is often used for call signaling or other control traffic, not specifically for interactive video.
CS6 (48) is typically reserved for network control traffic, a higher priority than interactive voice or video data.
Concept tested: Auto-QoS DSCP markings for voice and video
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND_40/QoSPh4_2.html
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