多项选择题

What are two step needed to define a QoS policy for a traffic class？（）

A.determine a minimum bandwidth guarantee
B.determine interfaces to which to apply policy
C.assign priorities to the class
D.configure access control lists

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多项选择题

Which three statements about classification marking of traffic at Layer 2 are true？（）

A.a Frame Relay header includes a 1-bit discard eligible （DE） bit to provide the class of service （CoS）
B.an ATM header includes a 1-bit DE field to provide the CoS
C.an MPLS EXP field is inserted in the Layer 3 IP precedence field to identify the CoS
D.the CoS field only exists inside Ethernet frames when 802.1Q or Inter-Switch Link （ISL） trunking is used
E.in the IEEE 802.1p standard， three bits are used to identify the user priority bits for the CoS
F.in the IEEE 802.1q standard， six bits are used to identify the user priority bits for the CoS

单项选择题

Which codec standard requires a bit rate of 64 kbps to maintain a mean opinion score of 4.1？（）

A.G711
B.G726
C.G728
D.G729
E.G729A

单项选择题

Refer to the exhibit. What mechanism should be used to increase the bandwidth availability and optimize the link usage throughout the network for voice traffic？（）

A.TCP header compression on router R1
B.TCP header compression on router R2
C.RTP header compression on router R1
D.RTP header compression on router R2
E.payload header compression on router R1
F.payload header compression on router R2