300-320 · Question #173
Which type of application traffic typically requires prioritization across networks and may use a DSCP value of 34 (AF41)?
The correct answer is B. interactive video. DSCP uses the Assured Forwarding (AF) Per-Hop Behavior classes (AF1x–AF4x), where a higher class number indicates higher priority. AF41 (binary 100010, decimal 34) belongs to the AF4 class, which is standardly mapped to interactive video traffic such as video conferencing…
Question
Which type of application traffic typically requires prioritization across networks and may use a DSCP value of 34 (AF41)?
Options
- Avoice
- Binteractive video
- Ccall signaling
- Drouting
- Estreaming video
- Fnetwork management
How the community answered
(58 responses)- A5% (3)
- B90% (52)
- C2% (1)
- E2% (1)
- F2% (1)
Explanation
DSCP uses the Assured Forwarding (AF) Per-Hop Behavior classes (AF1x–AF4x), where a higher class number indicates higher priority. AF41 (binary 100010, decimal 34) belongs to the AF4 class, which is standardly mapped to interactive video traffic such as video conferencing (e.g., Cisco Webex, Telepresence). Interactive video is delay- and jitter-sensitive and requires high-priority queuing but not the absolute lowest-latency treatment reserved for voice. Voice uses DSCP EF (Expedited Forwarding, decimal 46). Call signaling typically uses AF31 (DSCP 26) or CS3. Streaming video (non-interactive) commonly uses AF31 or lower. Routing protocols use CS6, and network management uses CS2 or similar values. AF41 is the RFC-recommended and Cisco-recommended marking for interactive video conferencing flows.
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