350-501 Automation and Quality of Services Practice Question
Which congestion avoidance mechanism is used to prevent tail drop by selectively dropping packets from lower-priority flows before the queue becomes full?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
WRED
WRED (Weighted Random Early Detection) drops packets probabilistically based on queue depth and IP precedence/DSCP, avoiding synchronization and providing congestion avoidance.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Policing
Why it's wrong here
Policing enforces rate limits, not queue management.
- ✗
LLQ
Why it's wrong here
LLQ is a queuing mechanism, not avoidance.
- ✗
CBWFQ
Why it's wrong here
CBWFQ is for bandwidth allocation.
- ✓
WRED
Why this is correct
WRED proactively drops packets to manage congestion.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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