Which two statements correctly identify considerations to take into account when deciding on Campus QoS Design elements? (Choose two.)

Question

Options

• AVoice needs to be assigned to the hardware priority queue.
• BVoice needs to be assigned to the software priority queue.
• CCall signaling must have guaranteed bandwidth service.
• DStrict-priority queuing should be limited to 50 percent of the capacity of the link.
• EAt least 33 percent of the link bandwidth should be reserved for default best-effort class.

• A
  75% (24)
• B
  6% (2)
• D
  16% (5)
• E
  3% (1)

Explanation

A is correct: Voice traffic requires the hardware priority queue (strict priority / LLQ). Software queues introduce latency and cannot guarantee the sub-150ms one-way delay and low jitter that voice demands. Hardware queuing processes packets at line rate before the software scheduler intervenes. C is correct: Call signaling (SIP, SCCP, H.323) must have guaranteed bandwidth via CBWFQ so that call setup and teardown messages are never dropped or excessively delayed - a signaling failure would cause calls to fail entirely. B is wrong because voice must use the hardware (not software) priority queue. D is wrong because Cisco's SRND guidance limits strict-priority queuing to no more than 33% of link bandwidth, not 50%, to prevent starvation of other traffic classes. E is wrong because reserving 33% for best-effort is not a standard design requirement - best-effort gets whatever bandwidth remains after priority and guaranteed classes are served.

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