先决条件——传输层的职责
1. SSH 文件传输协议(SFTP)：
它是一种建立在 SSH 之上的协议，用于以安全的方式有效地传输文件。使用此协议，它可以轻松地通过互联网连接安全地迁移大量数据。它利用 SSH 功能，使信息传输具有更高级别的保护。
2. 普通文件传输协议(TFTP)：
它是建立在 UDP/IP 协议之上的协议，它是一个简单的锁步文件传输协议，提供了从客户端到服务器传输文件的路径，反之亦然。通过使用该协议，我们可以将固件映像和网络文件传输到网络设备。
SFTP 和 TFTP 的区别：
|
S.No |
SFTP |
TFTP |
|---|---|---|
| 1. | It is short for Secure Shell File Transfer Protocol. | It is short for Trivial File Transfer Protocol. |
| 2. | It was founded by Tatu Ylönen in 1997. | It was first standardized in the year 1981. |
| 3. | It provides a secure channel for transferring files between the two endpoints. | It provides a path to transfer files from client to server and server to client. |
| 4. | It operates on port number 22. | It operates on port number 69. |
| 5. | It provides encryption and authentication for data transfer | It neither provides encryption not authentication. |
| 6. | It supports transfer resume method. | It supports lockstep method. |
| 7. | It uses FTP protocol but in more secure ways. | TFTP uses UDP protocol for transferring small single files. |
| 8. | It provides support for IPv6 HTTP protocols. | It does not provide any such protocols. |