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Huawei HCIA notes
2020-11-07 18:56:00 【Wang Ruifeng】
Network foundation
Layer 2 Ethernet protocol : The encapsulation of ether
1. Remember two numbers :4 18 ----->4 Parts of ,18 Bytes .
2. The goal is MAC 6 Bytes Source MAC 6 byte TYPE( type ) 2 byte FCS( check )2 byte
MAC Address :
1.24 Bit OUI+24 Bit custom
2. radio broadcast MAC :FF-FF-FF-FF-FF-FF ; unicast MAC : The lowest bit of the first byte Set up 0 ; Multicast MAC : The lowest bit of the second byte Set up 1
The sending and receiving of data :
1. Sending is a process of encapsulation ...
2. Receive a frame first check FCS, Read target MAC Address , See if it's your own , If so, receive , Look again TYPE What is the type , The decision is to leave it to the upper level agreement , If the goal is not your own drop.
Cables are commonly used 3 Kind of :1. Coaxial cable 2. Twisted pair 3. Optical fiber
Broadcast domain and conflict domain :
1. Broadcast domain refers to the range of broadcast frame transmission , The switch does not split the broadcast domain by default 、 The router divides the broadcast domain by default .
2. A shared media segment is in a conflict domain ,CSMA/CD Carrier sense multiple access technology with collision detection ------ It's not used now .
Duplex mode :
1. Simplex -------- TV
2. Half duplex ------- Walkie-talkie : Only one party initiates data at the same time .
3. full duplex ------- At any moment , Both sides can initiate data .
ARP agreement :
1. The upper layer of Ethernet protocol is divided into ARP:0x0806
2. Application scenarios ---- Address resolution : Use target IP Address to resolve the target MAC Address , If target IP Not in the same network with myself , Then the gateway is resolved MAC Address .
3. free ARP( Without any reason ARP): A new configuration IP After that, it will send out automatically ARP request , No reply is right .
4. When to launch ARP request : When there is no local target MAC At the address , By the church ARP request .( There is no local ARP When mapping table items )
版权声明
本文为[Wang Ruifeng]所创,转载请带上原文链接,感谢
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