7.Application Layer

1. Provides a user interface in the form of an entry point for programs to access the network infrastructure.

6.Presentation Layer

1. Responsible for code and char. set convergence, and recognizing data formats.

5.Session Layer

4.Transportation Layer

Segment

1. Acknowledgements, Sequencing, Flow control
2. TCP & UDP

3.Networking Layer

Packet

1. Routing
2. IP

2.DataLink Layer

Frame

1. Ethernet

1.Physical Layer

Bits

1. T1