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Accountancy Age

Skype的主要组成部分-Skype通讯协议分析(2)

1、端口
在Skype的连接属性对话框中可以设置监听的端口号，在安装的时候Skype会随机的选择一个端口作为监听的端口，这一点与HTTP协议等不同，Skype没有默认的服务端口。同时，它还会打开对80和443端口的监听。80是常见的HTTP服务默认端口，而443则是HTTPS服务的默认端口。
2、主机列表(HC，Host Cache)
这里的主机指的是可以提供踏板及广播服务的Super Node(SN)。通常它被存储在注册表里的：HKEY_CURRENT_USER / SOFTWARE / SKYPE / PHONE / LIB / CONNECTION / HOSTCACHE 中.一般情况下，运行两天后，HC中会有约200个机器地址及对应的端口号。

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