Shulou(Shulou.com)06/01 Report--

401 computer room is a local area network, there are two hosts in this network, we need to identify them, for example, one of them is called "host 1", and the other can be called "host 2". Is this numbering all right? Yes, you can. The following picture is shown: (if you can't see the picture clearly, you can click the picture to enlarge it.)

402 computer room is also a local area network, there are also two hosts in this network, and we also identify them as "host 1" and "host" respectively. Is this numbering okay? It's okay, too. As shown in the following figure

Now we need to connect the network of 401 computer room and 402 computer room, and the host 1 of 401 computer room needs to communicate with the host 2 of 402 computer room. According to the current number, can they communicate? At this time, the communication will be chaotic. Because the name of the second host in 401 computer room is "host 2", and the name of the second host in 402 computer room is also "host 2", when the packet sent by host 1 in 401 computer room, the destination address is only "host 2", is host 1 in 401 computer room communicating with host 2 in 401 computer room or host 2 in 402 computer room? At present, it is indistinguishable. As shown in the following figure:

How can we make the host 1 of 401 computer room communicate accurately with host 2 of 402 computer room?

In this way, we can mark mainframe 1 of 401 computer room as "401 computer room. Mainframe 1", and mainframe 2 of 402 computer room as "402 computer room. Mainframe 2". In this way, the number of the two hosts in the network is unique. Host 1 of 401 computer room can communicate with host 2 of 402 computer room only. As shown in the following figure:

The IP address is similar to the example above. Now let's use the IP address to number the host in the figure. As shown in the following figure:

In the figure above, host 1 in computer room 401 is numbered 194.1.1.1, and the previous 194.1.1 indicates that the host belongs to the 194.1.1.0 network. The following. 1 indicates that the host is the first host in this network.

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