1. DEF
   1. set of protocol
      1. used for the Internet
   2. vs OSI Model
      1. OSI
         1. more specialised
         2. explain more in details
      2. TCP/IP
         1. simplified
         2. applied for the Internet
   3. LAYERS
      1. Application
         1. Application
         2. Presentation
         3. Session
      2. Transport
         1. Transport
      3. Internet
         1. Network
      4. Link
         1. Datalink
         2. Physical
2. LINK
   1. physical connection
   2. Datalink/MAC layer
      1. carry packets into and out of a network
   3. eg of interfaces
      1. UTP – most typical
      2. Fibre optic connection
      3. Token ring
      4. Dial up modems
3. NETWORK
   1. DEF
      1. connectionless packet switched network layer implementation
   2. ROLE
      1. addressing & route selection
      2. packets
         1. attach IP header
         2. fragments packets into smaller parts
            1. reassemble at an immediate station
      3. moving packets of data from NODE -> NODE
         1. 1 hop at a time
         2. how? by referencing dynamic table
4. TCP
   1. ROLE
      1. verify
         1. the corrent delivery of data
            1. from client to server
      2. detect
         1. errors/lost data
         2. if incorrect
            1. trigger retransmission
   2. HOW
      1. accepts streams of data
      2. breaks the stream into segments
      3. hands the segments off to IP
      4. each segment requires sequence synchronisation
         1. assign sequential order
      5. assign CONNECTION IDENTIFIER
5. OTHERS
   1. HOST
      1. 0 zero
         1. used for "this network"
      2. all one (1s)
         1. seen by all hosts
      3. localhost
         1. 127.0.0.1
   2. SUBNET MARKS
6. NETWORK ADDRESS
   1. class A
      1. eg: 1 - 126.0.0.0
         1. 126 networks
         2. 16million+ users
   2. class B
      1. 128 - 191.0.0.0
         1. 16,384 networks
         2. 65,000 odd
   3. class C
      1. 192 - 224.0.0.0
         1. 2,097,152 networks
         2. 256 users
   4. class D