单项选择题
Which statement is true about the capabilities of a voice gateway router？（）
A.voice gateways with analog interfaces need a gatekeeper to convert analog signals into digital format before voice is encapsulated into IP packets
B.voice gateways need a gatekeeper to interconnect the VoIP networks the PSTN network
C.voice gateways with Cisco Unified CallManager Express （CME） can permanently act as a call agent for IP phones
D.voice gateways equipped with a DSP module can take the role of the call agent during WAN failure.
相关考题
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单项选择题
AGREtunnelisconfiguredbetweenalocalandaremotesite.Whereshouldtheservicepolicybeappliedtoclassifypacketsbasedonthepretunnelheader?（）
A.in global configuration mode， apply the service policy and use the qos pre-classify
B.in global configuration mode， apply the service policy but do not use the qos pre-classify command
C.apply the service policy on the physical interface but do not use the qos pre-classify
D.apply the service policy on the tunnel interface but do not use the qos pre-classify command
E.apply the service policy on the tunnel interface and use the qos pre-classify command -
多项选择题
WhataretwoofthethreepredefinedclassesfortheCiscoSDMwizard？（）
A.business-critical
B.high priority
C.middle class
D.voice
E.best effort
F.scavenger -
多项选择题
WhichtwostatementsaretrueabouttheapplicationofQoSinaconvergednetwork？（）
A.end-to-end network delay times that exceed 50 ms for real-time traffic are considered unacceptable
B.end-to-end network delay times that exceed 250 ms for real-time traffic are considered unacceptable
C.end-to-end network delay is not a factor as long as the delay is consistent
D.some packet loss can be corrected by codec algorithms
E.RSVP handles voice packet retransmission
F.fragmentation is a result of packet loss
