多项选择题
Which of the following protocols allow the set up, teardown and streaming of VoIP traffic? （）(SelectTWO)
A.NTP
B.VNC
C.RTP
D.SIP
E.TLS
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单项选择题
Which of the following devices is used to connect multiple devices to a network and does not stopbroadcast traffic?（）
A.Switch
B.Hub
C.Modem
D.Repeater -
单项选择题
An administrator is troubleshooting a communication issue between two computers on the same Layer 2 switch. Which of the following is the BEST way to determine if the switch is causing the issue?（）
A. Setup an ACL that allows and logs all IP traffic between the two computers
B. Configure a spanning tree to check for a loop
C. Setup a span port on the switch to watch for CRC errors
D. Connect both computers using a crossover cable -
单项选择题
Which of the following is equipment provided by the telephone company that provides remotediagnostic and loopback services for subscriber lines?（）
A. 66 block
B. Demarc
C. Smart jack
D. 110 block
