QoS refers to the ability of a network to provide improved service, over various underlying technologies, to select network traffic. Which two traits are inherent to QoS? (Choose two.)

Question

Options

• Aequal handling of all packets
• Bsupport for real-time applications
• Creduction in delay, jitter, and packet loss
• Dreference to network ability to provide improved service to all network traffic
• Ebest-effort actions

• B
  92% (22)
• D
  4% (1)
• E
  4% (1)

Explanation

QoS is fundamentally about prioritizing select traffic to guarantee performance for sensitive applications. B is correct because real-time applications (VoIP, video conferencing) are precisely the use case QoS was designed for - they cannot tolerate unpredictable delivery. C is correct because reducing delay (latency), jitter (delay variation), and packet loss are the three core, measurable outcomes that QoS mechanisms directly target.

Why the distractors fail:

• A is the opposite of QoS - equal handling describes best-effort, not QoS.
• D contradicts the question's own definition, which says "select network traffic," not all traffic.
• E best-effort is what you get without QoS - no guarantees, no prioritization.

Memory tip: Think of QoS as a VIP lane on a highway. VIP vehicles (real-time apps) get reduced delays and fewer crashes (packet loss/jitter) - everyone else waits. If all cars are treated equally (A/E), there's no VIP lane, which means no QoS.

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