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Basics of computer networks
- 1. Computer Networks Unit -1 Basics of Network and Networking Date: Presented By: Rubal Sagwal Department of Computer Engineering NIT, Kurukshetra Book Ref : Data Communication and Networking (Behrouz A. Forouzan) 1Rubal_CN
- 2. Contents • Introduction • Typesof network • Network basic terminology • Types of network architecture • Workgroup • Domain Rubal_CN 2
- 3. Introduction Network – ComputerNetwork – Advantages Rubal_CN 3
- 4. Network • WHAT? A groupor system of interconnected people or things. • Why? Connection Communication • Where? When we need to transfer anything. Rubal_CN 4
- 5. Computer Network • Acomputer network is a set of devices (often referred to as node) connected by communication links. • A node can be a computer, printer or any other device capable of sending or receiving data generated by other nodes on the network. Rubal_CN 5
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- 7. Networking • Networking isa process of communication between two or more remote parties, that involves the connection of computers, media and networking devices. Rubal_CN 7
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- 9. Advantages of Networking •Easy communication • File, data and information sharing • Resource sharing (hardware) • Increase storage capacity • Reduce cost • Save time Rubal_CN 9
- 10. Types of Networks PhysicalStructure – LAN – WAN – MAN Rubal_CN 10
- 11. Types of Network 1.Point to Point: 2. Multipoint: Rubal_CN 11
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- 13. Network Criteria • Performance TransitTime Response Time • Reliability Recovery from a failure • Security Protecting data from: • Unauthorized User • Damage Rubal_CN 13
- 14. Network Terms Host– Workstation–Server– Client– Node Rubal_CN 14
- 15. Host • A networkhost is a computer or other device connected to a computer network. • A network host may offer information resources, services, and applications to users or others nodes on the network. Rubal_CN 15
- 16. Workstation • A workstation(WS) is a computer dedicated to a user or group of users engaged in business or professional work. • It includes one or more high resolution displays and a faster processor than a personal computer (PC). • Useful for Distributed Computing. • Different from PC: • Faster • More capable Rubal_CN 16
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- 18. Client and Server •For process to process commutation we need Client Server Paradigm. • A process on local host, called a client, needs services from a process usually on the remote host called a server. • So, a server is an a computer program that accepts and responds to requests made by another program, known as a client. Rubal_CN 18
- 19. Node • A nodecan be a computer or some other device such as printer that can receive, create, store or send data along distributed network routes. Rubal_CN 19
- 20. Types of Network Architecture Peerto Peer – Client Server Model Rubal_CN 20
- 21. Peer-to-Peer Network • Apeer-to-peer network is one in which two or more PCs share files and access to devices such as printers without requiring a separate server computer or server software. Client-Server Network • In client-server model, where client request for a service to a server and server replies according to client request. Rubal_CN 21
- 22. Data Flow Simplex –Half Duplex – Full Duplex ADAD 22
- 23. Simplex Mode • InSimplex mode: • Communication is unidirectional, • Only one can transmit and other can receive. • Ex: keyboard and monitor Rubal_CN 23 Simplex Communication Structure Direction of Data
- 24. Half-Duplex Mode • InHalf Duplex mode: • Both can transmit and receive, • But not at a same time. • At a time, only one can send or receive. • Ex: Walkie-talkies Rubal_CN 24 Direction of Data at time 1 Half Duplex Communication Structure Direction of Data at time 2
- 25. Full-Duplex (Duplex) Mode •In Full Duplex mode: • Both station can transmit and receive simultaneously, • But at a same time. • Ex: Telephone Networks Rubal_CN 25 Full Duplex Communication Structure Direction of Data
- 26. Workgroup Vs. Domain Workgroup– Domain ADAD 26
- 27. Workgroup • A workgroupis a peer-to-peer network using common software. A workgroup allows all participating and connected systems to access shared resources such as files, system resources and printers. Domain • In a domain is a subnetwork made up of a group of clients and servers under the control of one central security database. Rubal_CN 27
- 28. Workgroup Vs Domain Rubal_CN28 Domain Workgroup • Computers on workplace networks are usually part of a domain. • Computers on home networks are usually part of a workgroup. • One or more computers are server. • All computers are peers. • For data security. • No data security.
- 29. Summery Rubal_CN 29 • Havestudied about Network. • Networking • Networking Terms • Data flow in a Network • Network architecture • Work group and Domain.