单项选择题
A. It is the individual link cost based on latency
B. It is the sum of the costs based on bandwidth
C. It is the total hop count
D. It is dynamically determined based on load
单项选择题 Which OSI layer header contains the address of a destination host that is another network?（）
单项选择题 You have set up an Internet based FTP server, where people can upload and download files. In terms of the OSI model, what is the highest layer used during the FTP sessions.（）
单项选择题 Which of the following layers of the TCP/IP model most closely corresponds to the network layer of the OSI model?（）