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CCIE Security Exam Certification Guide by Henry Benjamin

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File Transfer Protocol

File Transfer Protocol (FTP), an application layer protocol of the TCP/IP protocol suite of applications, allows users to transfer files from one host to another. Two ports are required for FTP—one port is used to open the connection (port 21), and the other port is used to transfer data (20). FTP runs over TCP and is a connection-oriented protocol. To provide security, FTP allows usernames and passwords to be exchanged before any data can be transferred, adding some form of security authentication mechanism to ensure that only valid users access FTP servers.

The advantages of FTP are the ability to list a remote FTP server's full list of directories and ensure that only valid users are connected. The file transfer progress ...

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