Match each QoS mechanism to its primary function.
Drag a concept onto its matching description — or click a concept then click the description.
Identifying packets based on specified criteria
Setting QoS bits (e.g., DSCP, CoS) in packet headers
Enforcing traffic rate limits by dropping or remarking excess packets
Buffering excess traffic to smooth output rate
Congestion avoidance by selectively dropping packets based on queue depth
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Classification: Identifies traffic based on specific criteria.
In QoS, Classification identifies traffic, Marking sets priority, Policing drops/excess, Shaping buffers, and WRED drops probabilistically. Queuing handles packet scheduling, not rate enforcement.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Classification: Identifies traffic based on specific criteria.
Why this is correct
Correct: Classification is the process of categorizing packets based on fields like IP precedence or DSCP.
Marking: Sets a specific value in the packet header to indicate priority.
Why this is correct
Correct: Marking modifies packet headers to set QoS identifiers like DSCP or CoS.
Policing: Drops or remark packets that exceed a configured rate.
Why this is correct
Correct: Policing enforces a rate limit by dropping or remarking excess traffic.
Shaping: Buffers packets to smooth traffic bursts and keep rate within limits.
Why this is correct
Correct: Shaping uses buffers to delay packets and conform to a rate, reducing bursts.
WRED: Drops packets probabilistically when queue depth exceeds thresholds to avoid tail drop.
Why this is correct
Correct: WRED avoids congestion by proactively dropping packets based on average queue depth.
Queuing: Drops packets that exceed a configured rate.
Why it's wrong here
Incorrect: This describes Policing, not Queuing. Queuing manages packet ordering and scheduling, not rate-based dropping.
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