Location-based call admission control is used in Cisco UCM to control the amount of bandwidth allowed between predefined locations. What must be considered when calculating the number of calls that can be made?
A.
A limit of 900 kb is the total amount of bandwidth used for the sum of the media and signaling in the calls. The system allows for an actual of 20% overhead of IP packet headers. This is to compare the use of ISDN lines with no IP overhead.
B.
A limit of 900 kb Is the total amount of bandwidth used for the sum of calls of the defined codec including headers and media traffic.
C.
A limit of 900 kb is the total amount of bandwidth used for the sum of calls. The use of compression does not impact the amount of calls because only the codec definition is considered when calculating the CAC in Cisco UCM.
D.
A limit of 900 kb is the total amount of actual used RTP traffic so the oversubscription can be done for multiple calls adding Its maximum RTP stream requirements.
The correct answer is B. When calculating the number of calls that can be made using location-based call admission control (CAC) in Cisco UCM, it is important to consider the amount of bandwidth used by the calls. The amount of bandwidth used by a call is the sum of the media traffic and signaling traffic, including any IP packet headers. The limit of bandwidth allowed is typically defined as a total amount for all calls, and the number of calls that can be made is calculated by dividing the total amount of available bandwidth by the amount of bandwidth used by each call. Therefore, option B is the correct answer
A. is incorrect. In the calculation, signaling is not considered.
C. is incorrect. CAC includes always overhead. For audio codecs, the overhead consist in the ip headers. In video, the overhead consist in just to add a 20%. Calculation of overhead is different in audio and video, however, an overhead is always considered.
D. Video codecs do not have a specific set bandwidth rate to them like audio codecs. You can place a video call using 480p30 resolution at 384 kbps or at 2 Mbps. However, using a higher codec can provided better efficiency and thus consume less bandwidth. For this reason in the regions, the calls are not defined by codecs, rather by per-call bandwidth.
B. Is correct. The amount of bandwidth is the sum of the calls including the media traffic consumed in function of the codec, plus the headers.
Reference: "CCNP and CCIE Collaboration Core CLCOR 350-801 Official Cert Guide"
Chapter 18: Cisco Unified Communications Manager Call Admission Control (CAC).
This section is not available anymore. Please use the main Exam Page.350-801 Exam Questions
Log in to ExamTopics
Sign in:
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
Testme1235
Highly Voted 8 months, 2 weeks agoG0y0
Most Recent 2 months agopapahawaii
9 months agoPanda_man
9 months, 1 week agowwisp3422112
11 months, 1 week ago