Win7系统电脑hosts文件详解
一、什么是hosts文件?
hosts是一个没有扩展名的系统文件，其基本作用就是将一些常用的网址域名与其对应的IP地址建立一个关联“数据库”，
当用户在浏览器中输入一个需要登录的网址时，系统会首先自动从Hosts文件中寻找对应的IP地址，一旦找到，系统会立即打开对应网页，如果没有找到，则系统再会将网址提交DNS域名解析服务器进行IP地址的解析，如果发现是被屏蔽的IP或域名，就会禁止打开此网页!
二、Win7的hosts 默认文件
文件地址：C：WINDOWSsystem32driversetchosts
默认里面的内容如下：
# Copyright (c) 1993-2009 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally， comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a ‘#’ symbol.
#
# For example：
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host
# localhost name resolution is handled within DNS itself.
# 127.0.0.1 localhost
# ：：1 localhost
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