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300-365 · Question #170

Your network has these characteristics: - CAC mode is set to load-based CAC - The bandwidth usage is between 75 and 85 percent - The reserved bandwidth for voice calls is exhausted Which action…

The correct answer is A. The normal TSPEC request is rejected and the expedited bandwidth request is admitted. With load-based CAC in the 75-85% bandwidth range and reserved voice bandwidth exhausted, normal TSPEC requests are rejected while expedited bandwidth requests are still admitted.

Wireless Troubleshooting and Optimization

Question

Your network has these characteristics:

  • CAC mode is set to load-based CAC
  • The bandwidth usage is between 75 and 85 percent
  • The reserved bandwidth for voice calls is exhausted

Which action occurs to TSPEC requests in this environment?

Options

  • AThe normal TSPEC request is rejected and the expedited bandwidth request is admitted
  • BThe normal TSPEC request is admitted and the expedited bandwidth request is rejected
  • CThe normal TSPEC request is rejected and the expedited bandwidth request is rejected
  • DThe normal TSPEC request is admitted and the expedited bandwidth request is admitted

How the community answered

(17 responses)
  • A
    59% (10)
  • B
    6% (1)
  • C
    24% (4)
  • D
    12% (2)

Why each option

With load-based CAC in the 75-85% bandwidth range and reserved voice bandwidth exhausted, normal TSPEC requests are rejected while expedited bandwidth requests are still admitted.

AThe normal TSPEC request is rejected and the expedited bandwidth request is admittedCorrect

In Cisco load-based CAC, when bandwidth utilization is between 75% and 85%, the system enters a restricted state where the reserved voice bandwidth pool is used first. Once that pool is exhausted, new normal TSPEC requests are denied. However, expedited bandwidth requests represent a separate, higher-priority allocation mechanism that can still be granted in this middle utilization band, allowing urgent voice sessions to be admitted while normal requests are blocked.

BThe normal TSPEC request is admitted and the expedited bandwidth request is rejected

This reverses the correct behavior - normal TSPEC is rejected (not admitted) when reserved bandwidth is exhausted, and expedited requests retain admission priority.

CThe normal TSPEC request is rejected and the expedited bandwidth request is rejected

Rejecting expedited requests only occurs above the 85% maximum utilization threshold; between 75-85%, expedited requests are still serviceable.

DThe normal TSPEC request is admitted and the expedited bandwidth request is admitted

Both cannot be admitted simultaneously when the reserved bandwidth pool is exhausted - at minimum, normal TSPEC requests must be rejected in this state.

Concept tested: Load-based CAC TSPEC admission control thresholds

Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-10/config-guide/b_cg810/qos.html

Topics

#load-based CAC#TSPEC#bandwidth reservation#QoS admission control

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