多项选择题

A. The rate of traffic is measured and compared to a co……

Which two characteristics are common between traffic policing and traffic shaping？（）

A. The rate of traffic is measured and compared to a configured policy.
B. Classification is used to differentiate traffic.
C. Traffic is marked and sent out according to priority.
D. Both can be applied to inbound and outbound traffic.
E. Both buffer traffic to ensure a predetermined traffic rate.
F. Both drop traffic that is above a predetermined traffic rate.

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多项选择题WhichtwoQoSclassificationandmarkingstatementsaretrue？（）

A. In a Frame Relay network， delay sensitive traffic is tagged with the discard eligible （DE） bit.
B. In an MPLS network， the three most significant bits of the DSCP or the IP precedence of the IP packet are copied into the MPLS EXP field.
C. In an MPLS network， the MPLS EXP bits are used to identify up to 16 CoS values.
D. The differentiated services code point （DSCP） field consists of the first three bits of the IP precedence field in the header of an IP packet.
E. The 802.1Q standard uses a three bit field referred to as the user priority bits （PRI） to mark packets as belonging to a specific CoS.

单项选择题Whatisthetermthatisusedtodescribetheprocessofconvertingasignalfromdigitaltoanalog？（）

A. packetization
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多项选择题WhataretworeasonstoimplementH·323gatekeepers？（）

A. to eliminate the need for VoIP gateways
B. to scale a VoIP installation with multiple gateways
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多项选择题WhatarethreefactorsusedtodeterminetheamountofbandwidththatisrequiredforasingleVoIPcall？（）

A. codec
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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.