Which of the following statements are TRUE? (Choose two)

Question

Options

• AThe primary contributors to latency are distance, scheduling, and congestion.
• BThe weighted round robin scheduling algorithm will result in more delay for high priority traffic
• CThe round robin scheduling algorithm will result in less jitter for low priority traffic than a strict
• DPacket loss can be reduced by decreasing the amount of buffer space available to a queue.
• ELatency can be reduced by increasing the amount of buffer space available to a queue.

• A
  77% (27)
• B
  14% (5)
• D
  6% (2)
• E
  3% (1)

Explanation

A is correct because latency in networks is fundamentally caused by three factors: distance (propagation delay as signals travel), scheduling (how long a packet waits in a queue before being sent), and congestion (queues fill up, increasing wait times). These three map directly to propagation, queuing, and congestion delay - the core latency components in networking.

C is correct because strict priority queuing starves low-priority queues whenever high-priority traffic is present, causing highly variable service intervals and therefore high jitter. Round robin cycles through all queues in turn, so low-priority traffic gets served at predictable intervals, producing more consistent (lower-jitter) delays.

B is wrong - Weighted Round Robin favors high-priority traffic by giving it more service turns, which reduces its delay. D is wrong - decreasing buffer space means queues fill faster and packets get dropped sooner; you need more buffer space to absorb bursts and reduce loss. E is wrong - this is the classic bufferbloat trap: more buffer space lets more packets pile up, which increases latency, not reduces it.

Memory tip: Think "DSC" for latency causes (Distance, Scheduling, Congestion). For E vs D, remember the tradeoff: bigger buffers = more latency but less loss - never both benefits at once.

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