What are three traffic descriptors that are used by the classification process to categorize packets that require special OoS handling？（）

单项选择题Whatmanagementtoolcouldbeusedtoprovidecentralizedconfiguration，monitoring，andmanagementinanetworkbuiltonCiscowirelessLANcontrollersandLightweightAPs？（）

A.CiscoWorks Wireless LAN Solution Engine （WLSE）
B.CiscoWorks Wireless LAN Solution Engine （WLSE） Express
C.Cisco Wireless Control System （WCS）
D.Wireless Domain Services （WDS）
E.WLAN Controllers （WLC）

多项选择题WhataretworeasonsforpacketlossonaVoIPconnection？（）

A.serialization delay
B.overrun
C.full buffers and queues
D.propagation delay
E.shaping delay
F.TCP header errors

单项选择题Whichstatementistrueaboutthecomponentsofaqueuingmechanism？（）

A.Each subinterface has its own hardware queue and can experience congestion just like its main interface
B.Hardware queuing is only used if the software queues are experiencing congestion.
C.Hardware queues and software queues are not used concurrently.
D.The hardware queuing system always uses the FIFO queuing mechanism.

多项选择题Whichtwostatementsaretrueabouttheprotocolsthatareusedfortransmittingvoicetraffic？（）

A.RTP multiplexing is used to keep multiple phone conversations separate
B.RTP provides end-to-end delivery services for voice traffic.
C.UDP is used to ensure a reliable transmission from sender to receiver.
D.RTP is used to provide resource reservation for the voice stream.
E.UDP provides multiplexing of multiple phone conversations.

多项选择题WhataretwocomponentsoftheOoSIntegratedServices（IntServ）model？（）

A.link efficiency
B.admission control
C.classification and marking
D.shaping and policing
E.congestion avoidance using the RTP protocol
F.resource reservation using the RSVP protocol