Basics of computer networks

What is Computer Network? What is Networking? Application of Networks. Network criteria. Types of Network. LAN, MAN, WAN, Workstation, Workgroup, Domain.

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 ) 1 Rubal_CN

2. Contents Introduction T ypes of network N etwork basic terminology Types of network architecture Workgroup Domain Rubal_CN 2

3. Introduction Network – Computer Network – Advantages Rubal_CN 3

4. Network WHAT? A group or system of interconnected people or things. W hy ? Connection Communication Where? When we need to transfer anything. Rubal_CN 4

5. Computer Network A computer 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

6. Computer Network Rubal_CN 6

7. Networking Networking is a process of communication between two or more remote parties, that involves the connection of computers, media and networking devices. Rubal_CN 7

8. Network Applications Rubal_CN 8 Network Application

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 Physical Structure – LAN – WAN – MAN Rubal_CN 10

11. Types of Network 1. Point to Point: 2. Multipoint: Rubal_CN 11

12. Categories of Network Rubal_CN 12

13. Network Criteria Performance Transit Time 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 network host 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

17. Client and Server Rubal_CN 17

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 node can 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 Peer to Peer – Client Server Model Rubal_CN 20

21. Peer-to-Peer Network A peer-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 In Simplex 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 In Half 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 workgroup is 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_CN 28 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 Have studied about Network. Networking Networking Terms Data flow in a Network Network architecture Work group and Domain.