| A | B |
|---|
| Application layer | Provides network services to a user application program. It is the hightest layer in the model and is the closest to the user. |
| Presentation layer | Provides data representation, data encryption, and data compression. Ensures data sent from and arriving to the application layer is readable. |
| Session layer | Establishes, maintains, and terminates sessions between applications. |
| Transport layer | Segments and reassembles data into a data stream. |
| Network layer | Determines the optimal way to move data from one place to another withing the network. |
| Data Link layer | Provides physical transmission across the network medium. |
| Physical layer | Provides the electrical, mechanical, procedural, and functional means for establishing and maintaining the physical link among systems. |
| SMTP, FTP, TFTP | Services that exist at the application layer of the TCP/IP model. |
| 100BaseT | Unshielded Twisted Pair |
| 100BaseX | Fast ethernet and either fiber or category 5 cabling. |
| Router | Used to segment a network. Layer 3 device. |
| Bridge | Used to physically separate a LAN into multiple segments. Layer 2 device. |
| Switch | Layer 2 device that provides dedicated bandwidth and increased throughput performance, port density, and greater flexibility. |
| Destination network address | The key piece of information on which routing decision are based. |
| MAC address | 48 character Hex address at the data link layer. Also referred to as the BIA. |
