多項選擇題

By default, which of the following ports would a network need to have opened to allow for thetransmission of incoming and outgoing email?（） (Select TWO).

A.21
B.25
C.80
D.110
E.123

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單項選擇題
A technician receives an urgent call that the switch in accounting is down. Which of the followingshould the technician do FIRST to troubleshoot this issue?（）
A. Identity symptoms and problems
B. Document the process and solutions
C. Establish the most probable cause
D. Escalate if necessary.
單項選擇題
Which of the following is a performance optimization technology?（）
A.QoS
B.Trunking
C.Spanning
D.VoIP