Which of the following statements is not correct regarding QoS and prioritization for traffic in a Cisco Unified Contact Center Enterprise deployment?

Question

Options

• AQoS is only required when a customer does not have sufficient bandwidth to handle the Cisco
• BA network that is not prioritized correctly almost always has heartbeat timeouts or heartbeat
• CLarge packets in a slow network can cause delay that results in the loss of one or more UDP

• A
  91% (21)
• B
  4% (1)
• C
  4% (1)

Explanation

Option A is the false statement because QoS is always a best practice requirement in UCCE deployments - not just a remedy for insufficient bandwidth. Even with adequate bandwidth, bursts of bulk traffic (large file transfers, backups) can momentarily monopolize the link and cause jitter, delay, or dropped packets for real-time voice and signaling traffic. Proper prioritization ensures time-sensitive traffic is always serviced first, regardless of how much bandwidth exists.

Option B is true - unprioritized networks frequently cause heartbeat timeouts because control/signaling packets compete with lower-priority data traffic and can be delayed long enough to trigger false failure detection and unnecessary failovers. Option C is also true - this describes serialization delay, where a large packet occupying a slow link blocks queued UDP/RTP voice packets, causing audio loss or gaps; QoS fragmentation and LLQ (Low Latency Queuing) are the standard mitigations.

Memory tip: Think "bandwidth is not enough - you must also queue smart." QoS is a design discipline, not a band-aid for undersized links - if you remember that distinction, option A will always stand out as the false claim.

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