单项选择题
Which of the following applications is MOST likely to require QoS to ensure proper functionality?（）
A. HTTP
B. VoIP
C. SNMPv3
D. Peer to peer
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A technician is troubleshooting a network connectivity issue. Given the following abbreviated trace route output: Which of the following is MOST likely occurring?（）
A. Switching loop
B. Broadcast storm
C. IP conflict
D. Routing loop -
单项选择题
At which of the following layers does the TCP protocol operate?（）
A.Layer 1
B.Layer 4
C.Layer 6
D.Layer 7 -
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A user on a network cannot access any network resources. The link light on the computer showsthat a connection is present. Which of the following is the MOST likely cause of the problem?（）
A. The wrong cable type has been used.
.B. IDS has shut down the computer's switch port.
C. The port on the switch is configured incorrectly
D. Spanning tree protocol was implemented.
