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服务器的端口分类很多,如果根据所提供的服务方式来划分,服务器端口可分为"TCP协议端口"和"UDP协议端口"两种。而采用TCP协议的是一种直接与接收方进行的连接,发送信息以后,可以确认信息是否到达的方式。
随着计算机网络技术的不断进步与发展,原来物理上的接口已不能满足日益增长的网络通信要求,为了解决这一通信难题,TCP/IP协议作为网络通信的标准协议应运而生。
使用TCP协议的常见端口主要有以下几种:
1.FTP:定义了文件传输协议,使用21端口。常说的计算机开了FTP服务便是启动了文件传输服务。下载文件、上传主页等都需要用到FTP服务。
2.Telnet:它是一种用于远程登陆的端口,用户可以以自己的身份远程连接到计算机上,通过这种端口可以提供一种基于DOS模式下的通信服务。如以前的BBS是纯字符界面的,支持BBS的服务器将23端口打开,对外提供服务。
3.SMTP:定义了简单邮件传送协议,很多邮件服务器都用的是这个协议,用于发送邮件。如常见的免费邮件服务中用的就是这个邮件服务端口,所以在电子邮件设置中常看到有这么SMTP端口设置这个栏,服务器开放的是25号端口。
4.POP3:它是和SMTP对应,POP3用于接收邮件。通常情况下,POP3协议所用的是110端口。也是说,只要你有相应的使用POP3协议的程序(例如Foxmail或Outlook),就可以不以Web方式登陆进邮箱界面,直接用邮件程序就可以收到邮件(如是163邮箱就没有必要先进入网易网站,再进入自己的邮箱来收信)。