这么算

来源: what5263 于 2003-11-11 16:57:00 [] [旧帖] [给我悄悄话] 阅读数 : (705 bytes)
本帖于 2004-02-06 15:24:48 时间, 由普通用户 old-cotton 编辑
回答: 有软件，也有书 由 二楼搂长 于 2003-11-11 10:12:00

要算的无非是三个class

1 and 126 it is a Class A address.
128 and 191 it is a Class B address
192 and 223 it is a Class C address
127 is reserved for local loopback

好， 那你的第一个例子来算，
10.10.0.0--10.10.127.255 这是class A的
在第三个octet上给了128个ip, 256-128=128
所以subnetmask是255.255.128.0
network address is 10.10.0.0
broadcast address is 10.10.127.255
gateway is set by admin, most set it as 10.10.0.1
however, it is not necessary.

至于， xxx.yyy.zzz.65-xxx.yyy.zzz.94
我假设这是class C 的， ip 的范围是 64 - 95
所以有32个ip, 2^5 = 32, 所以11100000 = 224
Subnetmask is 255.255.255.224
network address is xxx.yyy.zzz.64
broadcast address is xxx.yyy.zzz.95

whatever





--文学城www.wenxuecity.com--
请您先登陆，再发跟帖！