Network Models

Network Models

1. OSI Model

   • 7 Application
     • APIs
   • 6 Presentation
     • Converting data into readable formats by the system
   • 5 Session
     • Session tracking and naming
   • 4 Transport
     • Requests lost packets
     • assembles/dissassembles data
   • 3 Network
     • TCP/IP
       • IP
         • Logical Address
       • Packets
     • Router
   • 2 Data Link
     • NICs
       • Media Access Code
         • 48 bits
           • OUI
           • Device ID
           • 00-00-00-00-00-00
         • MAC or EUI
       • Frames
         • Recip. MAC || Sender MAC || Data || FCS
           • CRC
         • 1500 bytes
       • Broadcast FF-FF-FF-FF-FF-FF
     • • LLC
         • Deals with everything else
       • Media Access Control
         • Deals with MAC address
   • 1 - Physical
     • Cabling and Hubs
   • Prescriptive

2. TCP/IP

   • Application
     • 5,6,7
   • Transport
     • 4
     • TCP segment
     • UDP datagram
   • Internet
     • 3
     • IP packet
   • Link/Network Interface
     • 1,2
   • Descriptive

3. Connectionless

   • UDP

4. Connection-Orientated

   • TCP

5. All People Should Try Network Data Processing