210-060 Question #118: Real Exam Question with Answer & Explanation

The correct answer is B: DiffServ. DiffServ is the scalable, hop-by-hop QoS architecture recommended for enterprise VoIP deployments.

Question

An engineer must configure QoS for a VoIP network. Which option is the best QoS model for this task?

DiffServ is the scalable, hop-by-hop QoS architecture recommended for enterprise VoIP deployments.

Common mistakes.

A. IntServ requires RSVP signaling to reserve resources per flow on every router in the path, which does not scale for large VoIP deployments.
C. MPLS is a packet forwarding and traffic engineering technology, not a standalone QoS model, and requires a separate QoS framework like DiffServ to prioritize traffic.
D. FIFO is the default queue discipline that processes packets in arrival order with no traffic classification or prioritization, making it unsuitable for QoS.

Concept tested. DiffServ QoS model for VoIP traffic

Reference. https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoS-SRND-Book/DiffServMod.html

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