LESSON 5 SYSTEM IDENTIFICATION part II

5.2 Identifying Services
Once you have established the owner and the IP address of a domain, then you can start to
look for information about the server to which that domain refers.

 

5.2 识别服务器

一旦你找到了一个域名的所属者和IP地址，你就可以查询该域名所涉及到的服务器的信息。

 

5.2.1 Ping and TraceRoute
Now that you know who owns the domain, and who the IP number has been assigned to, you
can check to see if the server that the website is on is actually active. The ping command will
tell you if there is actually a computer associated with that domain or IP. The command
      ping domain or
      ping ipaddress

will tell you if there is an active computer at that address.
If the output of the ping command indicates that the packets sent were received, then you
can assume that the server is active.
Another command, tracert (in Windows) or traceroute (in Linux) will show you the steps that
information takes as it travels from your computer to the remote computer. Tracing the route
that the packets take will sometimes give you additional information about the computers in
the network with the computer that is the target of your trace. For example, computers will
similar IP addresses will often be part of the same network.‘（这句话是不是有点问题）

 

5.2.1 Ping 和 TraceToute

既然知道了该域名的所属者和IP地址的分配，你可以检查一下网站所在的服务器是不是在运行状态。ping指令

会告诉你是不是真的有台电脑和这个域名和IP地址有关。指令

      ping 域名 or
      ping ip地址

将告诉你是不是有一台该IP地址上的先用计算机。

如果输出结果显示发送的数据包被接收了，那么你可以肯定该服务器是先用的。

另一个指令，tracert（Windows系统）或者traceroute（Linux系统）将显示数据包从你的电脑到达远程电脑

所经过的步骤。追踪数据包传输的路径会给你提供关于传输路径上经过的电脑的额外信息。相似的IP地址所指的电脑

通常是在同个网络中。

 

Exercises:
Ping a valid website or IP address (ping www.isecom.org or ping 216.92.116.13). If you get a
successful response, ping the next IP address. Did this produce a successful response?
Use tracert or traceroute to trace the route from your local computer to the IP address that
you used in the previous exercise. How many steps does it take? Do any of the listed
computers have similar IP addresses?

 

练习：

Ping一个有效的网站或者IP地址（ping www.isecom.org 或者 ping 216.92.116.13）。如果响应成功，

ping下一个IP地址。能响应成功吗？

用tracert  或者 traceroute 来跟踪你的电脑连接到在前面的练习题上使用的IP地址的路径。需要多少步？

列出来的电脑有相同的IP地址吗？