Which statement is true about the Call Admission Control (CA

题目
单选题
Which statement is true about the Call Admission Control (CAC) feature in VoIP networks?()
A

 CAC is used to allocate enough bandwidth for the number of calls that are allowed on the VoIP network.

B

 CAC is used to protect the quality of the voice calls by preventing call establishment if enough resources are not available on the network.

C

 CAC provides queuing mechanisms for voice calls if the packets exceed the configured or budgeted rate.

D

 In a VoIP network the CAC can be replaced with the LLQ QoS mechanism if it has been properly implemented.

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相似问题和答案

第1题:

Which statement is true about a distributed call control environment and the processing of dialed digits from an IP phone?()

  • A、The router that is directly connected to the IP phone will look up the called number in its call routing table.
  • B、The router that is directly connected to the IP phone will inform its call agent when a service request is detected.
  • C、When the IP phone is picked up,the IP phone initiates the service request.
  • D、The directly connected router passes the collected digits to its call agent,and the call agent looks up in its call-routing table the called number.

正确答案:A

第2题:

Which statement is true about the routing table?()

  • A、The routing table exists in the control plane only.
  • B、The routing table exists in the control plane and in the forwarding plane.
  • C、The routing table contains both active and inactive routes.
  • D、The routing table is stored on compact flash.

正确答案:A

第3题:

Which statement is true about the frequency of OSPF LSA transmissions?()

A.A

B.B

C.C

D.D


参考答案:D

第4题:

Which statement is true about IBGP routers? ()

  • A、They must be fully meshed
  • B、They can be in a different AS
  • C、They must be directly connected

正确答案:C

第5题:

Which statement is true about vishing?()

  • A、Influencing users to forward a call to a toll number (for example, a long distance or international number)
  • B、Influencing users to provide personal information over a web page
  • C、Using an inside facilitator to intentionally forward a call to a toll number (for example, a long distance orinternational number)
  • D、Influencing users to provide personal information over the phone

正确答案:D

第6题:

Which two are functions of an IP voice gateway?()

  • A、provide far-end call control 
  • B、provide far-end camera control 
  • C、translate analog voice to packetized voice 
  • D、transition call path between different networks 
  • E、provide locations-based call admission control 

正确答案:A,C,D

第7题:

Which statement is true about the routing table?()

  • A、The routing table exists in the control plane only
  • B、The routing table exists in the control plane and the forwarding plane
  • C、The routing table contains both active and inactive routes
  • D、The routing table is stored on compact flash

正确答案:A

第8题:

Which IP telephony deployment model uses an H.225 Gatekeeper-Controlled trunk for call admission control within existing H.323 environments?()

A. single site with centralized call processing

B. single site with distributed call processing

C. multisite with centralized call processing

D. multisite with distributed call processing


参考答案:D

第9题:

Which statement is true about the distributed call control in a VoIP network?()

  • A、the VoIP endpoints have the intelligence to set up and control calls
  • B、Call setup and control functionality is centralized in one call agent or cluster
  • C、Call setup and control resides in call agents that are distributed throughout the network
  • D、Each VoIP device has separate call control, voice packetization, and transport mechanisms

正确答案:A

第10题:

In a Teleworker deployment with a single IP phone connected to a Cisco 831 router, select the true statement regarding Call Admission Control.()

  • A、RSVP is a required configuration to support conference calls without voice packet loss. 
  • B、The QoS configuration on the 831 router must always provision sufficient bandwidth for two RTP streams. 
  • C、Call admission control is an issue only when using hardware DSP resources. 
  • D、When using the conference call features on a 7960 IP phone, only one RTP stream is present regardless of how many extensions are on the conference.

正确答案:D

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