Computer Network.

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Presentation transcript:

Computer Network

Why Computer Network ??? Stand alone Computer …. FOR WHAT ???

Something interesting from Computer Network ??? Easiness No distance Mobility Efficient

Network Administrator,… Advantages Good salary Control other peoples Faster than others Relax Disadvantages ERROR, then people want to kill YOU !!!

Open System Interconnection (OSI) A model defines the stages or tasks of a protocol as it prepares to send data Open meaning standards available to all. The model is divided into seven distinct layers Each subsequent layer should perform a well-defined function and the layer boundaries are designed to minimize the information flow across the interfaces

OSI Model Layers Application Layer Presentation Layer Session Layer Provides a user interface (examples: HTTP, SMTP) Includes file, print, database, app. Services Presentation Layer Presents the data (example: JPEG) Includes encryption, compression and translation services Session Layer Keeps different applications data separate

OSI Model Layers Transport Layer Network Layer Provides reliable delivery Performs error detection Includes end to end connection Network Layer Provides logical addressing Routing layer

OSI Model Layers Data Link Layer Physical Layer Combines packets into bytes then into frames Performs error detection (not correction) Provides Media access addressing (point-to-point) Media Access Control and Data Link Control Physical Layer Moves bits between devices

Keys Layers of the OSI Model

OSI Model and Protocols

Network Devices Wire Wireless

Router, Switch, Hub, Modem, …

TCP/IP

TCP/IP

Network Security Firewall

Operating Systems

IPX - Internet Protocol Exchange (networking) RIP - Routing Information Protocol IGRP - Interior Gateway Routing Protocol (Cisco Systems routing protocol) OSPF - Open Shortest Path First

Server - Client

Certificate

Thank You… IPX - Internet Protocol Exchange (networking) RIP - Routing Information Protocol IGRP - Interior Gateway Routing Protocol (Cisco Systems routing protocol) OSPF - Open Shortest Path First Thank You…

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