多項選擇題What are two reasons to implement H·323 gatekeepers？（）

A. to eliminate the need for VoIP gateways
B. to scale a VoIP installation with multiple gateways
C. to provide call admission control and limit the number of simultaneous calls on the network 
D. to meet the requirement to control H·323 gateways on a LAN
E. to accept call requests and reduce the load on the gateway


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1.多項選擇題What are three factors used to determine the amount of bandwidth that is required for a single VoIP call？ （）

A. codec
B. link speed
C. Layer 2 encapsulation
D. packet overhead （IP/UDP/RTP）
E. link delay
F. total number of simultaneous calls that are allowed

2.多項選擇題What are two ways to minimize the delay of VoIP packets that are traversing a network？ （）

A. Use WFQ， CBWFQ， and LLQ to prioritize delay-sensitive packets.
B. Use WFQ， CBWFQ， and LLQ to compress the payload.
C. Give TCP packets priority over UDP packets.
D. Use control plane policing for cRTP queuing.
E. Use stacker and predictor to compress the payload.

3.多項選擇題What are three Cisco Unified CallManager features？ （）

A. programming interface to external applications
B. FXS and FXO port negotiation
C. AutoQos VoIP trust boundaries
D. signaling and device control
E. LLQ for voice and video traffic
F. directory and XML services

4.多項選擇題What are two components of the QoS Integrated Services （IntServ） model？（）

A. link efficiency
B. admission control
C. classification and marking
D. shaping and policing
E. congestion avoidance using the RTP protocol
F. resource reservation using the RSVP protocol

5.多項選擇題In a VoIP network， which three call signaling protocols are supported by the Cisco CallManager for call setup， call maintenance， and call teardown？ （）

A. H·323
B. UDP
C. RTP
D. TCP
E. Media Gateway Control Protocol （MGCP）
F. session initiation protocol （SIP）

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