Which of the following rate-limiting approaches are used on the Alcatel-Lucent 7750 SR? (Choose two)

Question

Options

• AShapeless policing at SAP-ingress only.
• BShapeless policing at SAP-ingress and egress.
• CBiased round robin queuing at ingress only.
• DSoft shaping at all network interfaces.
• ESoft shaping at network ingress only.

• A
  3% (2)
• B
  9% (6)
• C
  2% (1)
• D
  86% (55)

Explanation

On the Alcatel-Lucent 7750 SR, soft shaping is the rate-limiting mechanism applied at network interfaces - D confirms this applies to all network interfaces (no subset is excluded), and E correctly identifies that this soft shaping operates at network ingress only, not egress. These two facts are complementary: ingress soft shaping is uniformly enforced across every network-facing port on the platform.

Why the distractors are wrong:

• A & B introduce "shapeless policing," which is not a valid 7750 SR rate-limiting construct - policing exists (at SAP ingress), but the mechanism at network interfaces is shaping, not policing. B also incorrectly extends the scope to SAP egress.
• C ("biased round robin queuing") describes a scheduling algorithm, not a rate-limiting approach, and is not used for this purpose on the 7750 SR.

Memory tip: Think "NeSt IN" - Network interfaces use Soft shaping, applied INgress only. SAP interfaces use policing; network interfaces use shaping - and shaping only happens on the way in at the network side.

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