多项选择题

Whatarethreefactorsusedtodeterminetheamountofbandwidtht……

What are three factors used to determine the amount of bandwidth that is required for a single VoIP call？（）

A.codec
B.link speed
C.Layer 2 encapsulation
D.packet overhead （IP/UDP/RTP）
E.link delay
F.total number of simultaneous calls that are allowed

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单项选择题WhichstatementdescribesthedistributedcallcontrolmodelinVoIPnetworks？（）

A.The gateway voice-capable device is configured to support call control directly performing call setup， call maintenance， and call teardown
B.The gateway voice-capable device has a local call routing table configured through a routing protocol.
C.The gateway voice-capable device relies on a call agent to support call control.
D.The gateway voice-capable device relies on a gatekeeper to support call setup， call maintenance， and call teardown.

多项选择题WhichtwopairingsmatchtheapplicationwiththecorrectCosvalue？（）

A.CoS 0 = Best-Effort Data
B.CoS 1 = Best-Effort Data
C.CoS 3 = High Priority
D.CoS 4 = High Priority Data
E.CoS 5 = Voice Bearer
F.CoS 7 = Voice Bearer

多项选择题Whichtwooptionscanbeusedastrafficdescriptorswhenclassifyingandmarkingtraffic？（）

A.incoming interface
B.Layer 2 differentiated services code point （DSCP）
C.Layer 3 IP precedence
D.outgoing interface

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

A.forward an admission request to the local gatekeeper
B.forward an admission request to the remote gatekeeper
C.send a location request to the remote gateway
D.send a location request to the remote gatekeeper

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