300-320 · Question #24
Which QoS architecture provides scalability of implementation?
The correct answer is B. DiffServ. DiffServ (Differentiated Services) provides scalability because it uses DSCP (Differentiated Services Code Point) markings in the IP packet header to classify traffic at network edges. Core routers simply read the DSCP marking and apply a per-hop behavior (PHB)-they do not need…
Question
Which QoS architecture provides scalability of implementation?
Options
- AIntServ
- BDiffServ
- CLLQ
- DRSVP
How the community answered
(39 responses)- A5% (2)
- B92% (36)
- C3% (1)
Explanation
DiffServ (Differentiated Services) provides scalability because it uses DSCP (Differentiated Services Code Point) markings in the IP packet header to classify traffic at network edges. Core routers simply read the DSCP marking and apply a per-hop behavior (PHB)-they do not need to maintain per-flow state. This stateless, mark-and-forward model scales to millions of flows. IntServ (A) uses RSVP to reserve resources for every individual flow, requiring every router to maintain per-flow state-this does not scale in large networks. LLQ (C) is a queuing mechanism (not a full QoS architecture). RSVP (D) is the signaling protocol for IntServ, also not scalable for large deployments.
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