多项选择题
A. Latency fluctuates regardless of frame size.
B. The switch receives the complete frame before beginning to forward it.
C. Latency through the switch varies with frame length.
D. The switch checks the destination address upon receipt of headers.
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?（）
多项选择题 Which fields are included in the TCP header?（）
单项选择题 How many simultaneous Telnet sessions does a Cisco router support by default?（）