ping www.163.com与ping 163.com返回的结果为什么不一样？

[wtjd]

C:\Documents and Settings\david>ping www.163.com

Pinging www.cache.gslb.netease.com [220.181.28.212] with 32 bytes of data:

Reply from 220.181.28.212: bytes=32 time=34ms TTL=49
Reply from 220.181.28.212: bytes=32 time=33ms TTL=52
Reply from 220.181.28.212: bytes=32 time=33ms TTL=52
Reply from 220.181.28.212: bytes=32 time=33ms TTL=52

Ping statistics for 220.181.28.212:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 33ms, Maximum = 34ms, Average = 33ms

C:\Documents and Settings\david>ping 163.com

Pinging 163.com [220.181.31.8] with 32 bytes of data:

Reply from 220.181.31.8: bytes=32 time=34ms TTL=240
Reply from 220.181.31.8: bytes=32 time=33ms TTL=240
Reply from 220.181.31.8: bytes=32 time=33ms TTL=240
Reply from 220.181.31.8: bytes=32 time=35ms TTL=243

Ping statistics for 220.181.31.8:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 33ms, Maximum = 35ms, Average = 33ms

[drifter250771]

大型门户网站一般都有N多的服务器、N多的IP地址
所以用DNS来做负载均衡喽。一个域名指向多个IP地址，客户作DNS查询时就会被分配到随机答案

[wtjd]

可是我问的是， ping www.163.com 与ping 163.com 的区别，
加不加www有什么区别呢？

[drifter250771]

你买个域名xxx.com就知道了
在域名控制面板里可以把aaa.xxx.com、bbb.xxx.com、ccc.xxx.com、、、www.xxx.com和xxx.com指向不同IP地址
对域名的拥有人来说，前缀是可以自定义的

[wtjd]

还是不太明白 ping www.163.com 与ping 163.com有什么不一样？

[wtjd]

顶，

[wtjd]

顶，

[lishunli86]

[Quote=引用 3 楼 drifter250771 的回复:]
你买个域名xxx.com就知道了
在域名控制面板里可以把aaa.xxx.com、bbb.xxx.com、ccc.xxx.com、、、www.xxx.com和xxx.com指向不同IP地址
对域名的拥有人来说，前缀是可以自定义的
[/Quote]
这个说的很清楚!