Which QoS mechanism uses PHBs?

The correct answer is A. DiffServ. Differentiated Services (DiffServ) uses Per-Hop Behaviors (PHBs) to define how each router in the network treats packets at each hop. PHBs are signaled via the DSCP (Differentiated Services Code Point) field in the IP header. IntServ uses RSVP for end-to-end resource…

Advanced WAN Services

Question

Options

ADiffServ
BIntServ
CCoS
DToS

How the community answered

(30 responses)

A
90% (27)
B
7% (2)
D
3% (1)

Explanation

Differentiated Services (DiffServ) uses Per-Hop Behaviors (PHBs) to define how each router in the network treats packets at each hop. PHBs are signaled via the DSCP (Differentiated Services Code Point) field in the IP header. IntServ uses RSVP for end-to-end resource reservation and does not use PHBs. CoS is a Layer 2 marking mechanism (802.1p), and ToS is the older IP header field that DiffServ builds upon - neither uses PHBs.

Topics

#DiffServ#PHB#QoS models

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