Which of the following parameters is not a condition for link quality check?

Question

Options

• ADelay
• BBandwidth
• CJitter
• DPacket loss rate

• A
  3% (2)
• B
  84% (57)
• C
  4% (3)
• D
  9% (6)

Explanation

Bandwidth describes the maximum capacity of a link - it's a fixed or configured characteristic, not a real-time quality indicator. Link quality checks are designed to assess the health of a link dynamically, which is why delay (latency), jitter (variation in latency), and packet loss rate are the standard conditions: each of these fluctuates in real time and directly signals degradation in transmission quality.

• Delay is a distractor because high or inconsistent latency is a primary signal that a link is performing poorly.
• Jitter is a distractor because variability in delay degrades time-sensitive traffic (voice, video) and is a key quality metric.
• Packet loss rate is a distractor because dropped packets are the most direct evidence of link unreliability.

Memory tip: Think of the three quality conditions as things that can change while bandwidth stays the same - a 100 Mbps link can still have terrible delay, jitter, and loss. Bandwidth tells you the pipe size; the other three tell you how clean the pipe is.

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