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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相关考题
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多项选择题
Which fields are included in the TCP header?（）
A. Source Port
B. Acknowledgement Number
C. Request Number
D. Destination Address
E. Window
F. Data -
单项选择题
How many simultaneous Telnet sessions does a Cisco router support by default?（）
A.1
B.2
C.3
D.4
E.5
F.6 -
单项选择题
Which of the following protocols use both TCP and UDP ports?（）
A. FTP
B. SMTP
C. Telnet
D. DNS
E. All of the above
