Alcatel-Lucent NRS II – IP/MPLS Services — Question 53

Which of the following statements describe the operation of WRED on the Alcatel-Lucent 7750 SR? (Choose three)

Answer options

• A. WRED monitors the shared buffer space utilization over a period of time.
• B. WRED disables the TCP slow-start congestion control mechanism.
• C. WRED uses two configurable slopes for each buffer pool: a high slope and a low slope.
• D. WRED uses the shared buffer utilization, instead of the individual queue depth, to get a better picture of the average resource utilization of the shared buffer space.
• E. WRED polices the shared buffer pool and marks all packets above a certain rate as "discard eligible."

Correct answer: D

Explanation

The correct answer, D, is accurate because WRED indeed focuses on shared buffer utilization to assess resource usage. Option A is incorrect as it describes monitoring but not the focus on shared buffer utilization. Options B and E do not correctly represent WRED's function, as WRED does not disable TCP slow-start and does not mark all packets, only those that exceed certain thresholds.