转:哈哈,这是我在网上搜索到的很不错!看来给大家看看,大家来答答吧。这些问题看上去都是很简单的,其实并不是这样的。我一周以后公布答案!!
如果你觉得自己关于dns还算了解的话,请试着回答以下几个问题:
1、zone数据文件中的@代表什么?IN 代表什么?
2、为什么有时dig可以通过某个nameserver查询,而nslookup却告知无法找到nameserver?
3、什么是lame server?
4、你会做子网段不是8位8位时的IP地址反向解析吗?
5、Internet上是正向解析多还是反向解析多?
6、将zone数据传输功能关闭,你的域内主机就一定安全吗?
213.39.163.* 于 2007-05-27 02:47:16发表:
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200.82.150.* 于 2007-05-26 12:50:02发表:
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85.218.9.* 于 2007-05-25 20:45:49发表:
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82.253.156.* 于 2007-05-25 00:26:32发表:
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201.235.212.* 于 2007-05-24 08:11:47发表:
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201.213.4.* 于 2007-05-23 15:58:06发表:
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201.209.131.* 于 2007-05-21 20:52:28发表:
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200.109.152.* 于 2007-05-18 07:29:04发表:
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190.82.161.* 于 2007-05-16 21:58:45发表:
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201.212.200.* 于 2007-05-16 07:01:45发表:
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190.53.23.* 于 2007-05-14 11:37:55发表:
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82.213.136.* 于 2007-05-13 22:47:24发表:
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200.109.9.* 于 2007-05-13 10:34:26发表:
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83.55.12.* 于 2007-05-12 18:45:16发表:
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190.37.167.* 于 2007-05-12 04:17:49发表:
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83.49.0.* 于 2007-05-10 14:38:44发表:
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201.253.93.* 于 2007-05-09 04:49:36发表:
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190.36.135.* 于 2007-05-08 18:11:11发表:
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201.208.46.* 于 2007-05-08 04:18:46发表:
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190.37.42.* 于 2007-04-17 20:32:18发表:
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heven8383 于 2006-12-12 00:31:22发表:
:0)1
2000b871 于 2006-04-24 04:49:26发表:
zhi chi
dboo78 于 2005-10-14 00:52:55发表:
呵呵
root 于 2005-09-19 00:40:53发表:
不错,支持下
爱的边缘 于 2005-08-20 00:30:15发表:
呵呵,支持
风雨无阻 于 2005-06-05 00:17:55发表:
以下是DNS测试答案,我们以后还有搞这样的测试。
1、zone数据文件中的@代表什么?IN 代表什么?
@ 代表的是当前变量 $ORIGIN 的值,默认这个值为 zone 的域名。比如你设置了一个 123.net 的 zone ,那么 @ 默认表示 123.net。 IN 则代表 Internet 类。
2、为什么有时dig可以通过某个nameserver查询,而nslookup却告知无法找到nameserver?
nslookup 在启动时会向 dns server 发送一个反向解析,查询 dns server 的 IP 地址是否做了反向解析,如果 dns server 没做本机的反向解析,那么 nslookup 会告知找不到 ns。而 dig 则不做这个操作,因此不会有这样的情况。
3、什么是lame server?
http://www.menandmice.com/online_docs_and_faq/glossary/glossarytoc.htm?lame.server.htm
去这个地址看看吧!
4、你会做子网段不是8位8位时的IP地址反向解析吗?
http://bbs.chinaunix.net/forum/viewtopic.php?t=385903&show_type=&postdays=0&postorder=asc&start=0
看看这个帖子吧,或者你找一本《dns and bind》看看。
5、Internet上是正向解析多还是反向解析多?
反解多
6、将zone数据传输功能关闭,你的域内主机就一定安全吗?
这样也不安全的。现在大部分的域虽然都限制了 zone 数据传输,但有心者只需要通过反向扫描解析你的IP地址网段,一样能找到域内的主机哦。这也是 isc.org 统计 Internet 主机的方法。http://www.isc.org/ops/ds/new-survey.php