OSI Model
August 12, 2011 in CCNA by ciscoguy
| OSI Layer | Description |
|---|---|
| Application | User authentication, software communication |
| Presentation | Determines data formats and encryption (ie: JPG, ASCII) |
| Session | Defines how to start, end and control conversations |
| Transport | Error recovery, data delivery, flow control |
| Network | Logical addressing, routing, path determination |
| Data Link | Defines rules/protocols for when devices can send its data over mediums and defines format of headers and trailers |
| Physical | Cables, lights, electricity, etc. |
| OSI Layer | Protocol/Specs | Devices |
|---|---|---|
| Application/Presentation/Session | Telnet, FTP, HTTP, VoIP, POP3, SMTP | IDS, Firewall |
| Transport | TCP, UDP | |
| Network | IP | Router |
| Data Link | HDLC, PPP, IEEE, Frame Relay | WAP, Switch, Modem |
| Physical | RJ-45, IEEE | Hub, Repeater |