TCP/IP Protocol Architecture

Remember: 
Each layer provides a service to the layer above it.


There are four layers:

1. Application. Example: HTTP, POP3, SMTP

Acts as the interface between the software running on a computer and the network.
Most common example is the Browser

2. Transport. Example:  TCP, UDP

TCP provides a mechanism to guarantee data delivery by using a data-recovery feature.

3. Internet. Example: IP 

IP defines addresses so that each host can be found and data can be delivered to it. 

4. Network Access. Example: Ethernet, Frame Relay.

Defines the protocols and Hardware required to deliver data across the network.

Remember:
Same-layer Interaction on different computers 
Adjacent-layer Interaction on same computer

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