今天上午去面试了，把题目给大家共享！！

luqiqing

建议有兴趣的到www.linuxfans.org的“快乐企鹅家园"看别人讨论的结果.

qzhou9887

多谢"坚持到底"兄弟提醒，我还真没看清题目，用以下命令：
#rm -f `grep -R -l /tmp/sure`
------------------------------
我还有哪里不对劲的，尽管提！

qzhou9887

我真该死，漏掉搜索的字符password，把它补上：
#rm -f `grep -R -l password /tmp/sure`
----------------------------------------

yongjian

我认为255.255.255.32这样的掩码是不存在的,根据掩码的定义, 最小的是128,也就是第8位上的1.

yongjian

Ipv4 subnetting reference


CIDR
Netmask
Hosts / subnet
Classfull name
Typical Usage


/8
255.0.0.0
16777216
Class A
Largest block allocation made by IANA


/9
255.128.0.0
8388608


/10
255.192.0.0
4194304


/11
255.224.0.0
2097152


/12
255.240.0.0
1048576


/13
255.248.0.0
524288


/14
255.252.0.0
262144


/15
255.254.0.0
131072


/16
255.255.0.0
65536
Class B


/17
255.255.128.0
32768
ISP / large business


/18
255.255.192.0
16384
ISP / large business


/19
255.255.224.0
8192
ISP / large business


/20
255.255.240.0
4096
Small ISP / large business


/21
255.255.248.0
2048
Small ISP / large business


/22
255.255.252.0
1024


/23
255.255.254.0
512


/24
255.255.255.0
256
Class C
Large LAN


/25
255.255.255.128
128
Large LAN


/26
255.255.255.192
64
Small LAN


/27
255.255.255.224
32
Small LAN


/28
255.255.255.240
16
Small LAN


/29
255.255.255.248
8


/30
255.255.255.252
4
"Glue network" (point to point links)


/31
255.255.255.254
2
"Useless Network", proposed for point to point links (RFC 3021)


/32
255.255.255.255
1
Host route

坚持到底

单一个错误的子网掩码出现的时候，
255.255.255.32就有了。。。：）