Chuong 2 ftp tftp
Bạn đang xem bản rút gọn của tài liệu. Xem và tải ngay bản đầy đủ của tài liệu tại đây (981.34 KB, 48 trang )
Chapter 19
File Transfer:
FTP and TFTP
Objectives
Upon completion you will be able to:
• Understand the connections needed for FTP file transfer
• Be familiar with FTP commands and responses
• Know the differences between FTP and TFTP
• Be familiar with TFTP message types
• Understand TFTP flow and error control
TCP/IP Protocol Suite
1
19.1 FILE TRANSFER
PROTOCOL (FTP)
File Transfer Protocol (FTP) is the standard mechanism provided by
TCP/IP for copying a file from one host to another.
The topics discussed in this section include:
Connections
Communication
Command Processing
File Transfer
Anonymous FTP
TCP/IP Protocol Suite
2
Note:
FTP uses the services of TCP. It needs
two TCP connections.
The well-known port 21 is used for the
control connection and the well-known
port 20 for the data connection.
TCP/IP Protocol Suite
3
Figure 19.1
TCP/IP Protocol Suite
FTP
4
Figure 19.2
TCP/IP Protocol Suite
Opening the control connection
5
Figure 19.3
TCP/IP Protocol Suite
Creating the data connection
6
Figure 19.4
TCP/IP Protocol Suite
Using the control connection
7
Figure 19.5
TCP/IP Protocol Suite
Using the data connection
8
Figure 19.6
TCP/IP Protocol Suite
Command processing
9
Table 19.1 Access commands
TCP/IP Protocol Suite
10
Table 19.2 File management commands
TCP/IP Protocol Suite
11
Table 19.3 Data formatting commands
TCP/IP Protocol Suite
12
Table 19.4 Port defining commands
TCP/IP Protocol Suite
13
Table 19.5 File transfer commands
TCP/IP Protocol Suite
14
Table 19.5 File transfer commands (continued)
TCP/IP Protocol Suite
15
Table 19.6 Miscellaneous commands
TCP/IP Protocol Suite
16
Table 19.7 Responses
TCP/IP Protocol Suite
17
Table 19.7 Responses (continued)
TCP/IP Protocol Suite
18
Table 19.7 Responses (continued)
TCP/IP Protocol Suite
19
Table 19.7 Responses (continued)
Table 19.7 Responses (continued)
TCP/IP Protocol Suite
20
