The customer solution requires QoS to support streaming multimedia over a WAN. An architect chooses to use Per-Hop Behavior. Which solution should the engineer use to of mark traffic traveling…

Question

Options

• ALLQ with DSCP EF
• BCBWFQ with DSCP AF3
• CCBWFQ with DSCP AF2
• DLLQ with DSCP AF4

• A
  8% (2)
• B
  83% (20)
• C
  4% (1)
• D
  4% (1)

Explanation

CBWFQ (Class-Based Weighted Fair Queuing) with DSCP AF3 (Assured Forwarding class 3, DSCP values 26/28/30) is appropriate for streaming multimedia over a WAN. Streaming multimedia-such as adaptive video streaming-is bandwidth-intensive but has more tolerance for delay and jitter than real-time voice or interactive video conferencing. AF3x markings are conventionally assigned to broadcast/streaming video in the Cisco QoS design model, providing guaranteed bandwidth without the strict latency guarantees of LLQ. LLQ (options A and D) with EF (DSCP 46) is reserved for real-time, delay-sensitive traffic like VoIP, where strict priority queuing and minimal jitter are required. AF4x (option D) is typically used for real-time interactive video (e.g., videoconferencing), not streaming. AF2x (option C) is generally assigned to high-priority transactional data, not multimedia streaming.

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