JNCIP-DC: Juniper Networks Certified Professional – Data Center (2024) — Question 4

You are asked to set up an IP fabric that supports AI or ML workloads. You have chosen to use lossless Ethernet.
In this scenario, which statement is correct about congestion management?

Answer options

• A. The switch experiencing the congestion notifies the source device.
• B. Only the source and destination devices need ECN enabled.
• C. ECN marks packets based on WRED settings.
• D. ECN is negotiated only among the switches that make up the IP fabric for each queue.

Correct answer: C

Explanation

The correct answer, C, is accurate because ECN (Explicit Congestion Notification) uses WRED (Weighted Random Early Detection) settings to mark packets. The other options are incorrect: A misidentifies the notification process, B incorrectly states the requirements for ECN, and D inaccurately implies that ECN negotiation is limited to switches only.