多項選擇題What are two characteristics of the DiffServ model？（）

A.service guarantee
B.traffic that is divided into classes
C.not scalable to large implementations
D.QoS mechanisms that are used without prior signaling
E.applications that signal their particular QoS and bandwidth requirements


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1.多項選擇題Which three devices are used by the Cisco Wireless Control System （WCS） for wireless management？（）

A.WLAN controllers
B.WLAN Solution Engine （WLSE）
C.Cisco Wireless Control System （WCS）
D.Cisco Wireless Location Appliance
E.lightweight access point （AP）
F.autonomous access point （AP）

2.多項選擇題Which two Cisco AutoQoS configuration statements are true？ （）

A.the auto discovery qos command is supported on serial interfaces， subinterfaces， and virtual interfaces
B.CEF must be enabled before configuring the auto discovery qos command
C.the auto discovery qos privilege EXEC command must be configured on a router for several days to collect a sampling of data traffic
D.the auto qos trust command relies on NBAR to provide VoIP classification
E.the auto qos voip command configures the voip classification on routers and switches

4.多項選擇題What two steps need to be taken in deploying AutoQoS for enterprise on routers？（）

A.provide visibility into the classes of service deployed using system logging and SNMP traps
B.determine WAN settings for fragmentation， compression， encapsulation， and Frame Relay-ATM interworking
C.enable the AutoQoS VoIP for voice traffic
D.generate and deploy MQC-based QoS policies
E.profile the traffic with Auto-Discovery

5.單項選擇題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