300-320 Question #65: Real Exam Question with Answer & Explanation

The correct answer is A: RSVP. IntServ (Integrated Services) QoS relies on RSVP (Resource Reservation Protocol) for end-to-end signaling and resource reservation along the entire path.

Question

Which protocol is required for end-to-end signaling in an IntServ QoS architecture?

Options

ARSVP
BDSCP
CToS
DLLQ
EDiffServ

Explanation

IntServ (Integrated Services) QoS relies on RSVP (Resource Reservation Protocol) for end-to-end signaling and resource reservation along the entire path.

Common mistakes.

B. DSCP (Differentiated Services Code Point) is a packet marking mechanism used in DiffServ, not a signaling protocol and not part of the IntServ architecture.
C. ToS (Type of Service) is an older IP header field for marking precedence and is not a signaling protocol used for end-to-end reservation.
D. LLQ (Low Latency Queuing) is a queuing mechanism that combines priority queuing with CBWFQ and operates independently of IntServ signaling.
E. DiffServ is a separate, competing QoS architecture that uses per-hop behaviors and packet marking rather than end-to-end signaling and resource reservation.

Concept tested. IntServ QoS RSVP end-to-end signaling

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_rsvp/configuration/xe-16/qos-rsvp-xe-16-book/qos-rsvp-int-serv-rsrv-prot.html

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