多項選擇題When analog signals are digitized using the G.711 codec, voice samples are encapsulated into protocol data units (PDUs) involving which three headers? ()

A.IP
B.TCP
C.RTP
D.UDP
E.H323
F.CRTP

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1.單項選擇題Which statement is true about the distributed call control in a VoIP network?()

A.the VoIP endpoints have the intelligence to set up and control calls
B.Call setup and control functionality is centralized in one call agent or cluster
C.Call setup and control resides in call agents that are distributed throughout the network
D.Each VoIP device has separate call control, voice packetization, and transport mechanisms

2.單項選擇題What is the purpose of the NBAR protocol discovery?()

A.to build a Packet Description Language Module (PDLM) file to be used in protocol matching
B.to discover applications and build class maps for data classification
C.to look into the TCP or UDP payload and classify packets based on the content
D.to build a database of all application data that passes through the router and queue the data accordingly

4.多項選擇題Which two Cisco Wireless Control System (WCS) statements are true?()

A.the WCS Base version includes all the features of the WCS Location version as well as additional enhancements
B.the WCS Base version provides on-demand location of rogue access points and clients to within 33 feet (10 meters)
C.WCS adds a graphical view of multiple Cisco Wireless LAN controllers and managed access points
D.WCS includes a network management tool which is similar to a site survey tool
E.WCS uses the CDP protocol to communicate with the controllers

5.單項選擇題What is a drawback to using the IntServ model?()

A.RSVP that signals QoS requests per individual flow
B.not scalable to large implementations
C.admission control not supported
D.use of dynamic port numbers 
E.UDP not supported

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