- Layer 2 Data link layer (Ethernet)
Unit : Frame
Header : Includes MAC address of source and destination
Source broad casts the data and can receive data who has destination MAC address.
- Layer 3 Network Layer (IP)
Unit : Packet
Header : Includes IP addresses of source and destination
Use routing to distinct the network.
Routing table has IP and route information to find best route.
- Layer 4
Transport Layer (TCP/UDP)
Header : Use port to networking. http, ftp, smtp etc
Load balancing on the server farm environment
- Layer 7
Application Layer
To overcome L4's limitation.
Using more informations to networking : Data payloads (IP, port, URL, cookies, FTP file name, SSL ID, virus pattern etc)
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