Implementing and Operating Cisco Collaboration Core Technologies (CLCOR) — Question 193

How does WRED prevent congestion?

Answer options

• A. It marks which packets to drop randomly.
• B. It drops packets selectively based on the IP precedence value.
• C. It marks which packets to drop based on how much traffic the client sent.
• D. It drops packets that have a higher DSCP value last.

Correct answer: B

Explanation

The correct answer is B because WRED (Weighted Random Early Detection) uses the IP precedence value to decide which packets to drop to manage congestion effectively. Option A is incorrect as it describes random dropping without regard to IP precedence. Option C misrepresents WRED's functionality, as it does not base decisions solely on client traffic volume. Option D is also incorrect, as WRED does not prioritize dropping based on DSCP value.