多項(xiàng)選擇題For delay sensitive traffic, what are the three best ways that are used to prevent packet loss? ()

A. Compress payload.
B. Use header compression.
C. Increase link capacity.
D. Use random early detection.
E. Guarantee bandwidth to fragile flows.
F. Implement network-based application recognition.


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1.多項(xiàng)選擇題Which three functions are associated with a Cisco Unified CallManager? ()

A. connects traditional telephony devices to voice over IP infrastructure
B. converts analog signals to digital format
C. performs voice compression
D. performs call processing
E. performs dial plan administration
F. performs signaling and device control

2.多項(xiàng)選擇題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.

3.多項(xiàng)選擇題Which two QoS classification and marking statements are true? ()

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.

5.多項(xiàng)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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