Identify the link efficiency mechanism？（）

单项选择题Toprovidequalityofservice（QoS）forvoicetrafficinanIEEE802.1qnetwork，whichclassofservice（CoS）valueshouldbeusedinthe3-bit，userprioritybits（PRI）field？（）

A.The PRI field should contain the Cos value of 010
B.The PRI field should contain the Cos value of 011
C.The PRI field should contain the Cos value of 100
D.The PRI field should contain the Cos value of 101
E.The PRI field should contain the Cos value of 110
F.The PRI field should contain the CoS value of 111

多项选择题Whataretwobenefitsofcontrolplanepolicing？（）

A.protection against denial of service （DoS） attacks at infrastructure routers and switches
B. protection against known worm attacks in routers and switches
C.quality of service （QoS） control for packets that are sourced from the data plane of Cisco routers and switches
D.quality of service control （QoS） for packets that are destined to the control plane of Cisco routers and switches
E.quality of service （QoS） control for packets that are destined to the data plane of Cisco routers and switches

多项选择题WhichtwostatementsabouttheWLANSolutionEngine（WLSE）aretrue？（）

A.WLSE supports centralized configuration. 
B.WLSE supports distributed configuration.
C.WLSE can pick up statistics on a device even if the device is not properly configured.
D.WLSE can be used to upgrade the firmware on APs and bridges.
E.WLSE monitors device fault and performance conditions but cannot report any policy misconfigurations

多项选择题InaVoIPnetwork，whichthreecallsignalingprotocolsaresupportedbytheCiscoCallManagerforcallsetup，callmaintenance，andcallteardown？（）

A.H323
B.UDP
C.RTP
D.TCP
E.Media Gateway Control Protocol (MGCP)  
F.session initiation protocol (SIP) 

单项选择题WhatgatewayporttypecananalogphonesbeconnectedtoforuseonaVoIPnetwork？（）

A.FXS
B.FSO
C.E&M
D.auxiliary port
E.802.3af ethernetports