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This article mainly introduces the representation and classification of IP addresses and how routers connect multiple networks. Md has a certain reference value, friends who need can refer to it. I hope you will learn a lot after reading this article. Next, let the editor take you to learn about it.

The representation of IP

We know that ipv4 addresses are made up of 32 bits. We usually divide 32 bits into four equal parts. Separated, and each expressed in the familiar decimal system, here is an ip address

8.210.247.5

Classification of IP addresses

In order to manage IP addresses more conveniently, we artificially divide IP addresses into five categories, namely A, B, C, D and E. For these five categories, we can only use categories A, B and C. The other two categories have special functions. In addition, the IP address is divided into network bits and host bits.

Let's take a look at the characteristics of IP addresses:

IP address is a hierarchical address structure, the front part is the network bit, the back is the host bit, the network bit constitutes the network number, the host bit constitutes the host number. It is advantageous to use network bits. Routers only route and forward packets according to the network number, which can greatly reduce the items of the routing table in the router, reduce the storage space of the routing table and accelerate the speed of finding routes at the same time.

When a host has two or more IP addresses, such a host is called a multi-home host. Obviously, the router is a multi-home host because the router has at least two IP addresses.

A network is a collection of hosts with the same network number, so hosts connected by hubs or switches have the same network number, so they still belong to the same network. Different networks are connected by routers.

Routers connect to multiple networks

Used by a router to connect multiple networks and then forward packets between different networks. So how does the router accomplish this task? Suppose there are two networks, network A, network number 10.0.0.0, and network B, network number 20.0.0.0, which are connected by a router.

When A network host A1 (10.0.0.1) wants to communicate with B network host B1 (20.0.0.1), it must be forwarded through the router because they are on different networks. Host A first sends the packet to the router through router 10.0.0.255, and then forwards it to host B1 through the IP20.20.0.255 on the other port of the router.

Thank you for reading this article carefully. I hope the editor will share the representation and classification of IP addresses and how routers connect to multiple networks. md content will be helpful to everyone. At the same time, I also hope you will support us, pay attention to the industry information channels, and find out if you encounter problems. Detailed solutions are waiting for you to learn!

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