Open System Interconnection (OSI) ppt. - Printable Version +- Free Academic Seminars And Projects Reports (https://easyreport.in) +-- Forum: Project Ideas And Disscussion (https://easyreport.in/forumdisplay.php?fid=32) +--- Forum: Engineering Project Ideas (https://easyreport.in/forumdisplay.php?fid=33) +---- Forum: Computer Science Project Ideas (https://easyreport.in/forumdisplay.php?fid=36) +---- Thread: Open System Interconnection (OSI) ppt. (/showthread.php?tid=23381) |
Open System Interconnection (OSI) ppt. - sujajohn - 08-16-2017 [attachment=8162] Deepak Raut Project Guided By : Bhavna madam OSI REFERENCE MODEL 1. Physical Layer a) Convert the logical 1 s and 0 s coming from layer 2 into electrical signals. b) Transmission of the electrical signals over a communication channel. Main topics: Transmission mediums Encoding Modulation RS232 and RS422 standards Repeaters Hubs (multi-port repeater) 2. Data Link Layer a) Error control to compensate for the imperfections of the physical layer. b) Flow control to keep a fast sender from swamping a slow receiver. Main topics: Framing methods Error detection and correction methods Flow control Frame format IEE LAN standards Bridges Switches (multi-port bridges) 3. Network Layer a) Controls the operation of the subnet. b) Routing packets from source to destination. c) Logical addressing. Main topics: Internetworking Routing algorithms Internet Protocol (IP) addressing Routers 4. Transport Layer a) Provides additional Quality of Service. b) Heart of the OSI model. Main topics: Connection-oriented and connectionless services Transmission Control Protocol (TCP) User Datagram Protocol (UDP) 5. Session Layer a) Allows users on different machines to establish sessions between them. b) One of the services is managing dialogue control. c) Token management. d) Synchronization. 6. Presentation Layer a) Concerned with the syntax and semantics of the information. b) Preserves the meaning of the information. c) Data compression. d) Data encryption. 7. Application Layer a) Provides protocols that are commonly needed. Main topics: File Transfer Protocol (FTP) HyperText Transfer Protocol (HTTP) Simple Mail Transfer Protocol (SMTP) Simple Network Management Protocol (SNMP) Network File System (NFS) Telnet SERVICES Each layer provides services to the layer above it. 1. Terminologies Entities active elements in each layer (e.g. process, intelligent I/O chip). Peer Entities entities in the same layer on different machines. Service Provider Layer N. Service User Layer N + 1. Service Access Points places where layer N + 1 can access services offered by layer N. 2. Connection-Oriented and Connectionless Connection-Oriented before data is sent, the service from the sending computer must establish a connection with the receiving computer. Connectionless data can be sent at any time by the service from the sending computer. 3. Service Primitives Request entity wants the service to do some work Indicate entity is to be informed about an event Response entity responds to an event Confirm entity is to be informed about its request Sending Computer Receiving Computer |