| A | B |
|---|
| Application Layer Position | Layer 7 |
| Application Layer Purpose | File transfer |
| Presentation Layer Position | Layer 6 |
| Presentation Layer Purpose | Provides transformations on data so that it is presentable |
| Session Layer Position | Layer 5 |
| Session Layer Purpose | Establishes and manages and terminates sessions (connections) between applications |
| Transport Layer Position | Layer 4 |
| Transport Layer Purpose | Provides reliable transport of data between end points |
| Network Layer Position | Layer 3 |
| Network Layer Purpose | Organizes data into datagrams (packets) |
| Data Link Layer Position | Layer 2 |
| Data Link Layer Purpose | Provides reliable transit of data across a physical link |
| Physical Layer Position | Layer 1 |
| Physical Layer Purpose | Transmits and receives bits |
