Which of the following statements regarding policing and shaping on the Alcatel-Lucent 7750 SR are TRUE? (Choose two)

Question

Options

• AThe larger the configured MBS value, the lower the amount of shaping performed.
• BWhen policing is enabled on the SAP-ingress, all traffic is considered as in-profile.
• CSetting the CIRto 1000 and the PIRto max will enable shapeless policing at 1 Mbps within the
• DConfiguring MBS to equal CBS will disable shaping.
• ESetting the CIR and PIRto equal values disables soft-policing.

• A
  7% (2)
• B
  71% (20)
• C
  4% (1)
• D
  18% (5)

Explanation

B is correct because on the 7750 SR, SAP-ingress policing (when enabled without an explicit CIR below the PIR) marks all conforming traffic as in-profile by default - there is no out-of-profile classification at ingress unless a sub-rate CIR is explicitly configured.

E is correct because "soft-policing" on the 7750 SR is the mechanism that allows traffic between the CIR and PIR to pass as out-of-profile rather than being dropped. When CIR = PIR, that middle zone disappears entirely - traffic is either in-profile (below the rate) or dropped (above it), so soft-policing is effectively disabled.

Why the distractors are wrong:

• A - Larger MBS increases burst tolerance, it does not reduce shaping. The PIR controls the shaping rate, not MBS.
• C - Setting CIR=1000 and PIR=max creates a 1 Mbps in-profile threshold with no upper rate limit applied; this is not "shapeless policing at 1 Mbps" - it simply removes the PIR ceiling.
• D - Setting MBS equal to CBS constrains burst headroom but does not disable shaping; shaping is governed by the PIR, not by the relationship between MBS and CBS.

Memory tip: Think of CIR and PIR as the "green zone" and "yellow zone" boundaries. When those two boundaries merge (CIR = PIR), there is no yellow zone - and no yellow zone means no soft-policing. For option B, remember: ingress policing defaults to in-profile unless you explicitly carve out an out-of-profile bucket via CIR.

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