4Feb/100
Computer Science: Study Notes [OSI Model + Summerised ] – yr 12
| The OSI Model | ||||
| Definiton | Protocols | |||
| 7. Application layer | This layer interacts with the software -> closest to the end user | ftp, http | ||
| 6. Presentation | responisble for delivery and formatting of information | ASCII, LPP | ||
| Host Layers |
5. Session | Controls the connections between computers. Establishes, manages and terminates the connection between local and remote applications |
ADSP, ZIP, PAD | |
| 4. Transport | Provides transfer between users, reliable services to the upper layers controls the flow, segmentation/ desegmentation and error control. |
TCP, UDP, SPX | ||
| 3. Network | Provides the functional means of transferring data from source to the destination as well as amintain qaulity of service requested by the transport layer. |
IPv4, IPv6 | ||
| Media Layers |
2. Data-link | Provides the function and procedural means to transfer between network devices as well as finding possilbe errors in the physical layer. |
Ethernet, ATM | |
| 1. Physical | The physical devices that make up the network - such as hubs, switchs and calbes |
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| OSI MODEL | All People Seem To Need Data Processing | |||
| Summerised OSI Model | Protacals | |||
| 7. Aplication Layer | User Application Services | DNS, FTP, HTTP, SMTP | ||
| 6. Presentaion Layer | Data Translation; Compression and Encryption | SSL | ||
| Host Layers |
5. Session Layer | Session Establishment, Management and Termination | NetBIOS | |
| 4. Transport Layer | Flow control, Connections | TCP, UDP | ||
| 3. Network Layer | Logical addressign; Routing; error handling and diagnostic | IP, NAT, IPv6 | ||
| Media Layers |
2. Data-Link | Error detection and handling of the physical layer; Addressign; Data Framing Logical Link Control | ATM, PPP | |
| 1. Physical | The network topology and design, hardware specifications. | Ethernet |