350-501 · Question #80
Which additional feature does MPLS DiffServ tunneling support?
The correct answer is D. PHB layer management. MPLS DiffServ tunneling (which operates in Pipe, Short Pipe, or Uniform mode) defines how QoS markings are handled as packets traverse an MPLS network. Beyond the basic tunneling modes, it additionally supports PHB (Per-Hop Behavior) layer management, which allows operators to ma
Question
Which additional feature does MPLS DiffServ tunneling support?
Options
- Amatching EXP and DSCP values
- Binteraction between MPLS and IGP
- Cusing GRE tunnels to hide markings
- DPHB layer management
How the community answered
(38 responses)- A5% (2)
- C3% (1)
- D92% (35)
Explanation
MPLS DiffServ tunneling (which operates in Pipe, Short Pipe, or Uniform mode) defines how QoS markings are handled as packets traverse an MPLS network. Beyond the basic tunneling modes, it additionally supports PHB (Per-Hop Behavior) layer management, which allows operators to manage and apply different PHB treatments independently at the MPLS label layer versus the IP layer. This gives service providers fine-grained control over QoS enforcement at each hop. Options A (matching EXP and DSCP) describes a basic DiffServ function, Option B (IGP interaction) is unrelated to DiffServ tunneling, and Option C (GRE tunnels) is a completely different encapsulation technology.
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