Shulou(Shulou.com)06/02 Report--

FTP service, Web service

I. Overview and Construction of FTP

1. FTP is an application layer protocol, which is designed with Cramp S structure. In the transport layer, 21 (control connection) and 20 (data connection) of TCP are used.

2. Set up a FTP site

Second, commonly used FTP server programs

1. An optional role service in the role of IIS:Windows Server 2012 R2

IIS components mainly provide services such as WWW, FTP, SMTP, etc.

Configure the default FTP website

1. Install the FTP server

Add role (IIs/ftp)

2. Configure default FTP

1) Home directory (C:\ inetpub\ ftproot)

2) account security: anonymous access by default

3) Directory security

Authorized access

Access denied

4) visit: FTP://IP or domain name

IV. FTP client

1. Common FTP client programs

1) www browser

2) Command line tools

Command line (get, mget download multiple, put, mput upload multiple)

Note: use the command to access the anonymous user anonymous (password is empty) or ftp (password ftp) of FTP

Use Serv-U to build FTP server

2. Serv-U: any PC can be set as a FTP server

Other FTP server programs:

Xlight ftp server

RaidenFTPD

EFT Server

FileZilla Server (free and open source)

VI. WEB service

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TCP Protocol and UDP Protocol

1. TCP transmission control protocol

2. Advantages and disadvantages of TCP

Advantages: reliable, connection-oriented protocol

Disadvantages: low transmission efficiency

3. UDP user Datagram protocol

4. Advantages and disadvantages of UDP.

Advantages: high transmission efficiency

Disadvantages: unreliable, connectionless services

Functions of common protocols and corresponding port numbers

1. DNS (Domain Name System) domain name system

Function: used to complete the mapping between domain name and IP address

The port number is 53 of TCP or UDP

2. SMTP simple Mail transfer Protocol

Function: used to send and receive mail; port number 25 of TCP

3. POP3 Post Office Protocol version 3

Function: for clients to receive mail; port number TCP

4. HTTP Hypertext transfer Protocol

Function: used to transmit plain text, hypertext, audio and video data used by Internet browsers.

The port number is 80 of TCP

5. HTTPS secure Hypertext transfer Protocol

Function: provide encryption; port number is TCP 443

6. FTP File transfer Protocol

Function: used to transfer files; port numbers 21 and 20 of TCP

7. TFTP simple File transfer Protocol

Function: for file transfer; port number is UDP 69

8 、 Telnet

Function: used for text remote management of network devices such as computers or routers

The port number is 23 of TCP

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