单项选择题

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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多项选择题

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

单项选择题

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

单项选择题

A. FTP
B. SMTP
C. Telnet
D. DNS
E. All of the above