2. 计算机
  3. 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

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

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问题 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.
A. Application
B. Presentation
C. Session
D. Transport
E. Internet
F. Data Link
G. Physical
选项
答案A
解析 Explanation:
The application layer is the highest layer (layer 7) of the OSI model, and is reserved for end user applications. Since FTP is itself an application, layer 7 is the highest layer used.

Incorrect Answers:
B, C, D, E, F, G. In any given FTP session, all of these layers will be used at some point but they are incorrect because the question asked for the highest layer used by FTP.
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