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18、DNS服务-来杯咖啡-51CTO博客
source link: http://blog.51cto.com/10631377/2068556
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1、不同主机程序（进程）间通讯机制： socket：ip+port2、裸套接字： 无需调用传输层的tcp和utp协议端口号，而自身可以实现此功能，并能借助网络层发送出去。3、DNS：domain name server；是一个应用层程序 协议端口：tcp：53，udp：534、客户
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