The communication process and principle of peer-to-peer host are very simple

Hello everyone , Today, let's share the communication process and principle of peer-to-peer hosts

Explanation of peer-to-peer network ：

Peer to peer network adopts decentralized management , Each computer in the network can work as both a client and a server , Each user manages the resources on his machine .

Look at this network topology ：

Let's sort it out ：（ Analysis of experimental environment ）

We can see
pc1 192.168.10.10 255.255.255.0 54-89-98-EB-33-3A
pc2 192.168.10.20 255.255.255.0 54-89-98-FD-58-3D

The result is ： They are the hosts of the same segment （ In a network ）

Yes, of course , And because of that , They can communicate

That's what it is pc2 Communication results on ：

To configure pc1 Of ip
Be careful ip Address , Mask ,mac Address

to pc2 Configure address

That's what it is pc2 Communication results on ：

We'd better study the process and principle that they can communicate

First , We need to know that they are used ICMP Protocol for communication , The two sides negotiate from the third level （ It's the network layer ）, take ICMP Packets are encapsulated in ip Headlines , Source ip yes 192.168.10.10, Purpose ip yes 192.168.10.20, Send the data message to the data link layer
The data link layer will mac Address encapsulation , Contains source mac Address 54-89-98-EB-33-3A And purpose Mac 54-89-98-FD-58-3D, Then it will be sent to the physical layer
Finally, it is converted into an electrical signal and transmitted in the network medium

Here's a question ：

Is how to know each other Mac Address of the ？

When the host is encapsulated in the data link layer Mac At the address , The host will find its own ARP( Address resolution protocol ) Address table , If he can find ip The address and the corresponding Mac Address , Will continue the subsequent packaging process , If no relevant records are found , Start the process of inquiry

pc1 In not in your own arp The cache table finds the corresponding information , It will be sent ARP Request message , This source ip Address and mac The address is pc1 Their own , Destination address ip It's each other's ,pc1 The purpose of sending Mac FF-FF-FF-FF-FF( This is a broadcast address , Hosts in a broadcast domain can receive ), For the understanding of broadcast domain, you can think of it as the same network , Because in our peer-to-peer network, there are only pc1,pc2 Two computers , therefore pc2 You can receive this broadcast address

This pc1 Among the broadcast messages sent pc1 Their own ip Address and mac A corresponding information of the address ,pc2 The cache table address of has its own ip Address and mac ,pc2 Will give pc1 Send a ARP And then give pc1

This is the time ,pc1 Will pc2 Of ip Address and mac Put your own AR Cache table address , After the pc2 Of ip Address and mac Assignment in mac Inside the bag , Then it will be sent to the physical layer
Finally, it is converted into an electrical signal and transmitted in the network medium

This is it. pc1 Of ARP Cache table （ There are pc2 Of ip Middle and Mac Address ）

Okay , That's all for the communication process and principle of peer-to-peer host , Thank you.