300-320 · Question #355
Engineer is designing QoS for application. Which QoS architecture should he choose if application needs to have reserved bandwidth prior to sending data?
The correct answer is B. Integrated services. Integrated Services (IntServ) is the only QoS architecture that provides hard bandwidth reservation before data transmission begins. It uses RSVP (Resource Reservation Protocol) to signal bandwidth requirements hop-by-hop along the entire path, and each router reserves the…
Question
Engineer is designing QoS for application. Which QoS architecture should he choose if application needs to have reserved bandwidth prior to sending data?
Options
- ADifferentiated services
- BIntegrated services
- CLLQ
- DToS
How the community answered
(34 responses)- B91% (31)
- C3% (1)
- D6% (2)
Explanation
Integrated Services (IntServ) is the only QoS architecture that provides hard bandwidth reservation before data transmission begins. It uses RSVP (Resource Reservation Protocol) to signal bandwidth requirements hop-by-hop along the entire path, and each router reserves the requested resources. The application is guaranteed its bandwidth for the duration of the flow. Differentiated Services (DiffServ) only marks packets and applies per-hop behaviors but provides no end-to-end reservation. LLQ is a queuing mechanism, and ToS is a packet marking field-neither reserves bandwidth prior to sending.
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