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What is the role of RSVP in IntServ?
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RSVP allows the receiver to request guaranteed QoS for data flows and maintains per-flow states at intermediate routers.
What is the purpose of a Service Level Agreement (SLA) in the context of DiffServ?
SLAs define the expected QoS parameters for traffic streams and establish rules for traffic classification.
Describe the traffic conditioning components in DiffServ.
Components include Meter, Marker, Shaper, and Dropper, which manage traffic compliance and flow.
What protocol does IntServ use for reserving resources for new flows?
IntServ uses the Resource Reservation Protocol (RSVP) for reserving resources.
How does DiffServ handle per-flow state?
DiffServ does not maintain per-flow state, simplifying the process and enhancing scalability.
What is the role of bandwidth brokers in DiffServ domains?
Bandwidth brokers receive requests through routers and either accept or deny these requests based on available bandwidth.
What does IntServ use to ensure requested QoS is met?
IntServ uses resource reservations and coordination between routers based on Service Level Agreements (SLAs).
How do edge routers in DiffServ domains enforce compliance with SLAs?
Edge routers enforce compliance through policing, ensuring traffic adheres to the priority classes set by SLAs.
What are the two main Quality of Service (QoS) architectures discussed?
Integrated Service Architecture (IntServ) and Differentiated Service Architecture (DiffServ).
What is the main difference in the complexity of managing QoS between IntServ and DiffServ?
IntServ is more complex due to the need for coordination and resource reservation across many routers, whereas DiffServ simplifies management by not maintaining per-flow state.
What is the main scalability concern with RSVP in IntServ?
RSVP maintains per-flow states at intermediate routers, which can introduce scalability issues.
Explain the concept of 'Per Hop Behaviour' (PHB) in DiffServ.
PHB defines the forwarding properties for incoming packets based on their DSCP classification.
Define 'Flowspec' in the context of RSVP.
Flowspec specifies the desired level of QoS, such as peak bandwidth and latency.
How does DiffServ differ from IntServ in terms of service guarantee?
DiffServ offers a best-effort service and does not guarantee QoS, unlike IntServ which provides guaranteed service.
What are the key components of the forwarding plane in IntServ routers?
Classifier & Route Selection and Packet Scheduler.
What is the primary function of the Differentiated Services Code Point (DSCP) in DiffServ?
DSCP classifies packets into fixed traffic classes, which determine their forwarding properties.
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