300-070 · Question #5
Which DiffServ PHB classification is recommended by Cisco for interactive video traffic?
The correct answer is D. AF41. Cisco recommends AF41 (Assured Forwarding class 4, drop precedence 1, DSCP value 34) for interactive video traffic such as video conferencing. AF41 provides assured forwarding with relatively high priority and low drop probability, which suits the latency-sensitive and…
Question
Which DiffServ PHB classification is recommended by Cisco for interactive video traffic?
Options
- AAF31
- BCS3
- CEF
- DAF41
- ECS4
How the community answered
(21 responses)- A5% (1)
- C5% (1)
- D90% (19)
Explanation
Cisco recommends AF41 (Assured Forwarding class 4, drop precedence 1, DSCP value 34) for interactive video traffic such as video conferencing. AF41 provides assured forwarding with relatively high priority and low drop probability, which suits the latency-sensitive and bandwidth-intensive nature of interactive video. EF (C) is reserved for voice (RTP audio), as it provides the highest priority with minimal delay and jitter. AF31 (A) is recommended for call signaling or streaming video in some models. CS3 (B) is used for call signaling traffic. CS4 (E) may be used for video conferencing in some legacy models but AF41 is the current Cisco standard recommendation for interactive video per its QoS design guides.
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