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4A0-107 · Question #82

Which of the following statements regarding egress FC and profile over-ride are TRUE? (Choose two)

The correct answer is B. This feature is available on egress SAPs within any service. E. If a Behavior Aggregate (BA) and Multi-field (MF) match occurs, the BA classification can override. Egress FC and profile override is a Nokia SR OS feature that gives fine-grained control over how packets are classified and remarked on the way out. Why B and E are correct: Option B is correct because egress FC and profile override is available on egress SAPs across any…

Ingress and Egress QoS

Question

Which of the following statements regarding egress FC and profile over-ride are TRUE? (Choose two)

Options

  • APackets can be classified into 16 different FCs when using priority mode queuing.
  • BThis feature is available on egress SAPs within any service.
  • CMPLS EXP bits can be changed based on multi-field classification.
  • DIf a Behavior Aggregate (BA) and Multi-field (MF) match occurs, only the MF override parameters
  • EIf a Behavior Aggregate (BA) and Multi-field (MF) match occurs, the BA classification can override

How the community answered

(29 responses)
  • A
    17% (5)
  • B
    72% (21)
  • C
    3% (1)
  • D
    7% (2)

Explanation

Egress FC and profile override is a Nokia SR OS feature that gives fine-grained control over how packets are classified and remarked on the way out.

Why B and E are correct: Option B is correct because egress FC and profile override is available on egress SAPs across any service type - Epipe, VPLS, VPRN, etc. - making it broadly applicable. Option E is correct because when both a Behavior Aggregate (BA) classification and a Multi-field (MF) classification match the same packet, the BA classification parameters can take precedence and override the MF result, which is the defining behavior of this feature.

Why the distractors are wrong:

  • A is wrong because Nokia SR OS supports only 8 Forwarding Classes (be, l2, af, l1, h2, ef, h1, nc), not 16 - regardless of queuing mode.
  • C is wrong because MPLS EXP bit remarking is controlled through egress marking policies, not through multi-field classification.
  • D is the opposite of E - it implies only MF override parameters apply when both match, which contradicts how BA-wins behavior works in this feature.

Memory tip: Think "BA can Boss Around MF" - when both match, the Behavior Aggregate classification has the authority to override Multi-field results. For option B, remember "any service = B for Broad."

Topics

#Egress QoS#Forwarding Class#Profile Override#BA/MF Classification

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