多项选择题

AutoQoS takes the interface type and bandwidth into consideration when implementing what three QoS features？（）

A.FECN
B.LLQ
C.WRED
D.LFI
E.CRTP
F.CBWFQ

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单项选择题

Which functionality in the Cisco IOS software will enable a router to permanently act as a call agent for phones？（）

A.Cisco CallManager
B.Cisco CallManger Express （CME）
C.Cisco CallManager Gateway （CMG）
D.Cisco CallManager Voice Gateway （CMVG）
E.Media Gateway Control Protocol （MGCP）

单项选择题

How does weighted random early detection （WRED） prevent packet loss？（）

A.increases link capacity
B.increases buffer space to accommodate bursts of traffic from delay-sensitive applications
C.provides prioritized forwarding for drop-sensitive applications
D.drop lower priority packets before congestion occurs
E.separates traffic into as many as 64 queues that can be uniquely prioritized

单项选择题

Which two statements are true about the protocols that are used for transmitting voice traffic？（）

A.RTP multiplexing is used to keep multiple phone conversations separate
B.RTP provides end-to-end delivery services for voice traffic
C.UDP is used to ensure a reliable transmission from sender to receiver
D.RTP is used to provide resource reservation for the voice stream
E.UDP provides multiplexing

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