单项选择题

A branch office of Acme Insurance has 15 IP phones connected to the main office using the distributed call processing model. Normally， the phones work with great quality. However， during very busy times when all of the agents are on the phone at the same time， the voice quality drops precipitously. Words or phrases or both are dropped from conversations. What is the most likely cause of the problem？（）

A.large files are being downloaded over the WAN network
B.IP phone traffic is not being classified correctly
C.more bandwidth is required for the office LAN
D.Call Admission Control has not been implemented
E.employees are watching videos over the internet
F.header compression is not being used

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热门试题

多项选择题WhichtwoQoSstatementsaretrueabouttheuseoftheSDMQoSwizard？（）

A.business-critical traffic includes VoIP and voice signaling packets
B.SDM can be used to configure a basic QoS policy for incoming traffic on WAN interfaces andIPsec tunnels
C.SDM can provide QoS for real-time traffic and business-critical traffic
D.SDM creates a custom-queuing （CQ） or a priority-queuing （PQ） policy
E.SDM creates a low latency queuing （LLQ） service policy with its associated classes
F.when allocating bandwidth， values can be entered in either bandwidth percentage or kilobytes per second （kBps）

多项选择题WhichtwofeaturesaresupportedbytheWLANSolutionEngine（WLSE）？（）

A.configuration of APs
B.auto discovery of rogue APs
C.reporting
D.WLSE in two versions： base and location
E.graphical view of multiple controllers and managed APs

多项选择题WhichthreetrafficdescriptorsaretypicallyusedasQoSmarkingsforpacketsorframesenteringthenetwork？（）

A.protocol type
B.CoS
C.DSCP
D.IP precedence
E.destination address
F.input interface

单项选择题WhatistrueaboutQualityofService（QoS）forVPNs？（）

A.QoS preclassification is only supported on generic routing encapsulation （GRE） and IPsec VPNs
B.QoS preclassification is not required in Layer 2 Tunneling Protocol （L2TP）， Layer2 Forwarding （L2F）， and Point-to-Point Tunneling Protocol （PPTP） VPNs
C.QoS preclassification is supported on IPsec AH VPNs， but not on IPsec ESP VPNs
D.the QoS-for-VPNs feature （QoS preclassification） is designed for VPN transport interfaces
E.with IPsec tunnel mode， the type of service （ToS） byte value is copied automatically from the original IP header to the tunnel header

多项选择题Whatarethreetypesofpacketdelaysthatoccurinanetwork？（）

A.timing
B.queuing
C.differential
D.serialization
E.packetization
F.propagation