Which statement about the DiffServ QoS deployment architecture is true?

Question

Options

• ADiffServ does not differentiate traffic types and thus cannot provide service levels.
• BDiffServ architecture differentiates and classifies various types of traffic and provides several
• CResource Reservation Protocol is an example of a DiffServ mechanism where each router on the
• DDiffServ architecture provides QoS by assuring treatment for a specific traffic flow.

• A
  6% (2)
• B
  91% (32)
• D
  3% (1)

Explanation

Differentiated Services (DiffServ) is a coarse-grained, class-based QoS model. It classifies and marks packets at the network edge using DSCP (Differentiated Services Code Point) values in the IP header, then network devices apply per-hop behaviors (PHBs) based on those markings to provide different service levels to different traffic classes (e.g., voice gets Expedited Forwarding, video gets Assured Forwarding). Option A is false - DiffServ explicitly differentiates traffic types. Option C is false - RSVP (Resource Reservation Protocol) is an IntServ (Integrated Services) mechanism, not DiffServ; RSVP reserves per-flow resources end-to-end. Option D describes IntServ behavior (per-flow guarantees), not DiffServ, which is per-class rather than per-flow.

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