What will the H.323 gateways do when they receive a call request?（）

 

多项选择题WhichtwostatementsabouttheimplementationofWLANQoSaretrue？（）

A.The 802.11e standard is the IEEE 802.11 OoS WLAN standard.
B.The Wi-Fi Multimedia （WMM） standard decreases the eight priority levels to four access categories.
C.The Wi-Fi Multimedia （WMM） standard is a Wi-Fi Alliance standard that increases the four priority levels to eight access categories.
D.The Wi-Fi Multimedia （WMM） standard is an IEEE standard that increases the four priority levels to eight access categories.
E.Wireless 802.11 deploys Distributed Coordination Function （DCF）， carrier sense multiple access with collision detection （CSMA/CD）， interframe spacing， and random wait timers to avoid collisions.
F.Wireless OoS designs and implementations commonly use Layer 3 differentiated services code point （DSCP） or Layer 2 802.1 p to ensure priority

多项选择题WhatarethreetrafficdescriptorsthatareusedbytheclassificationprocesstocategorizepacketsthatrequirespecialOoShandling？（）

A.Resource Reservation Protocol （RSVP）
B.IP precedence
C.traffic shaping
D.trust boundaries
E.DSCP
F.application

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.