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單項(xiàng)選擇題

Catalyst switches utilize a special technology to identify and prevent topology loops and ensure that data flows properly through a single network path. What is the name of this technology?（）

A. VTP
B. ISL
C. 802.1Q
D. STP
E. None of the above

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多項(xiàng)選擇題

Which fields are included in the TCP header?（）

A. Source Port
B. Acknowledgement Number
C. Request Number
D. Destination Address
E. Window
F. Data

單項(xiàng)選擇題

How many simultaneous Telnet sessions does a Cisco router support by default?（）

A.1
B.2
C.3
D.4
E.5
F.6

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