多项选择题

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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多项选择题

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）

多项选择题

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

多项选择题

When a router converts analog signals to digital signals， what three steps are always included in the process？（）

A.involution
B.encoding
C.sampling
D.quantization
E.compression
F.companding