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300-365 · Question #28

An engineer wants to configure Call Admission Control and ensure that AC is based on the capacity of the AP and considering the possible impact of other APs in the area. Which two configuration…

The correct answer is B. Admission Control C. Load-Based AC. Load-Based CAC measures actual channel utilization - including interference from neighboring APs - and requires both Admission Control enabled and Load-Based AC selected to gate new voice calls based on real channel capacity.

Wireless Deployment

Question

An engineer wants to configure Call Admission Control and ensure that AC is based on the capacity of the AP and considering the possible impact of other APs in the area. Which two configuration options are required? (Choose two.)

Options

  • AStaticCAC
  • BAdmission Control
  • CLoad-Based AC
  • DAdd Traffic Stream
  • EReserved Roaming Bandwidth
  • FExpedited Bandwidth

How the community answered

(19 responses)
  • A
    16% (3)
  • B
    74% (14)
  • D
    5% (1)
  • F
    5% (1)

Why each option

Load-Based CAC measures actual channel utilization - including interference from neighboring APs - and requires both Admission Control enabled and Load-Based AC selected to gate new voice calls based on real channel capacity.

AStaticCAC

Static CAC uses a fixed configured-bandwidth model per AP radio and does not account for real-time channel utilization or interference from neighboring APs.

BAdmission ControlCorrect

Admission Control must be enabled on the WLAN to activate the CAC enforcement mechanism that blocks or permits new voice TSPECs.

CLoad-Based ACCorrect

Load-Based AC (channel utilization-based CAC) evaluates total channel occupancy including co-channel interference from overlapping APs in the area, satisfying the requirement to consider neighboring AP impact - unlike Static CAC which only tracks bandwidth allocated by the controller itself.

DAdd Traffic Stream

Add Traffic Stream is the client-side TSPEC request action, not a controller-side CAC algorithm selection option.

EReserved Roaming Bandwidth

Reserved Roaming Bandwidth sets aside a bandwidth percentage for roaming handoffs but does not define the admission control algorithm used to evaluate new calls.

FExpedited Bandwidth

Expedited Bandwidth enables prioritized treatment for emergency calls (e.g., E911) and is not a required element for configuring the load-based admission control algorithm.

Concept tested: Wireless Load-Based Call Admission Control configuration on WLC

Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/qos.html

Topics

#CAC#load-based admission control#VoWLAN#QoS

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