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.
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)- A59% (10)
- B6% (1)
- C24% (4)
- D12% (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.
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.
This reverses the correct behavior - normal TSPEC is rejected (not admitted) when reserved bandwidth is exhausted, and expedited requests retain admission priority.
Rejecting expedited requests only occurs above the 85% maximum utilization threshold; between 75-85%, expedited requests are still serviceable.
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
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