多項選擇題Which two statements are true about the application of QoS in a converged network?()

A.end-to-end network delay times that exceed 50 ms for real-time traffic are considered unacceptable
B.end-to-end network delay times that exceed 250 ms for real-time traffic are considered unacceptable
C.end-to-end network delay is not a factor as long as the  delay is consistent
D.some packet loss can be corrected by codec algorithms
E.RSVP handles voice packet retransmission
F.fragmentation is a result of packet loss


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1.單項選擇題What best describes an FXO interface?()

A.analog trunks that provide the Survivable Remote Site Telephony (SRST) feature 
B.analog trunks that provide VoIP gateway functionality 
C.analog trunks that connect a gateway to plain old telephone service (POTS) device such as analog phones, fax machines, and legacy voice-mail systems  
D.analog trunks that connect a gateway to a central office (CO) or private branch exchange (PBX)

3.單項選擇題Which statement is true about a distributed call control environment and the processing of dialed digits from an IP phone?()

A.The router that is directly connected to the IP phone will look up the called number in its call routing table.
B.The router that is directly connected to the IP phone will inform its call agent when a service request is detected.
C.When the IP phone is picked up,the IP phone initiates the service request.
D.The directly connected router passes the collected digits to its call agent,and the call agent looks up in its call-routing table the called number.

4.多項選擇題What are two major sources of delay that can be managed by QoS in voice-enabled networks?()

A.propagation delay
B.voice packet serialization delay
C.congested egress queues
D.header overhead
E.packets dropped because of CRC errors

5.多項選擇題Which two statements are true about voice ports on a router?()

A.Calls to the PSTN can be made via the use of FXO or T1/E1 trunk ports.
B.Calls to the PSTN can be made via FXS or T1/E1 trunk ports.
C.Analog and IP phones can be connected to the VoIP network via FXO or T1/E1 trunk ports.
D.Calls between analog phones that are attached to the FXS ports in a VoIP network can be completely processed by voice-enabled routers.

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