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| OSI | Internet 4 Layer | Protocols |
| --------------------------- | ------------------- | --------------------------------------- |
| Application<br>Presentation | Application | HTTP<br>SMTP<br>Telnet |
| Session<br>Transport | Host2Host Transport | TCP, UDP |
| Network | Internet | IP, ICMP |
| Data Link<br>Physical | Network Access | PPP<br>IP-over-ADSL<br>IP-over-Ethernet |
# Internet Protocol version 4
- Connectionless packet oriented service
- Unreliable service, no guarantee of delivery
- Best effort, no error recovery
All packets routed independently
- Routers examine destination IP address and choose best route to forward packet
- Big packets fragmented, fragments routed separately