Multi-media Computers and Computer Networks

Questions ? Media is used for ………………… Multimedia computer is capable of integrating ………………………………….. OCR stands for ……………………………. Images are composed of a collection of …….. Pixel components are -----, and

Media A medium is something, which can be used for presentation of information. Two ways to present information: Unimedia presentation Multimedia presentation Multimedia presentation greatly enhances the comprehension capability of users.

Presentation of Information Total voters in a constituency: Female voters: Male voters: Total votes cast: Candidate-1: Candidate-2: Candidate-3: 10510

Multimedia Computer System System which is capable of integrating two or more types of media for the purpose of generation, storage, representation, manipulation and access of multimedia information. Media can be: text, graphics, images, animation, audio and video.

Multimedia Components

Multimedia Computer System - Hardware Requirements Printer (output) Monitor (output) Speaker (output) Scanner (input) Mouse (input) Keyboard (input) System unit (processor, memory … ) Storage devices (CD-RW, Floppy, Hard disk, zip, … )

Multimedia Applications

Answers Media is used for presenting information. Multimedia computer is capable of integrating two or more types of media. OCR stands for Optical Character Recognizer. Images are composed of a collection of pixels. Pixel components are R-Red, G-Green and B-Blue.

Questions ? Computer Network is an interconnection of ……………………………….. LAN stands for ……………………….. MAN stands for ………………………. WAN stands for ……………………….. NIC stands for ……………………… Types of n/w ………….

Computer network connects two or more autonomous computers. The computers can be geographically located anywhere. Introduction to Computer Networks Computer Networks

Uses of Computer Networks Introduction to Computer Networks Resource Sharing Hardware (computing resources, disks, printers) Software (application software) Information Sharing Easy accessibility from anywhere (files, databases) Search Capability (WWW) Communication Message broadcast Remote computing Distributed processing (GRID Computing)

L A N Introduction to Computer Networks Network in small geographical Area (Room, Building or a Campus) is called LAN LAN- Local Area Network used by schools and businesses used to connect around computers in a building only accessible from within the building

M A N & W A N Network in a City is called MAN (Metropolitan Area Network) Network spread geographically (Country or across Globe) is called WAN (Wide Area Network)

Network Concepts Introduction to Computer Networks Network Hardware –Servers- powerful computers dedicated to controlling all of the systems on the network. All networked computers are connected to the server in some way –Printers- One of the reasons networks were developed was to make a single printer accessible by many different computers –Computers- individual machines that are connected to the server –Network Interface Card (NIC)- a device that is installed into a computer to give it a terminal that can run a cable to access the network

Network Software Introduction to Computer Networks Network Operating System –the system software run on the server –An operating system (OS) is software that computers use to run the environment that allows you to access applications and create files. Without an OS, a computer is useless. Networked Applications –computer programs located on the network that are accessed by individual computers –This makes loading software on individual computers unnecessary. OS Logos

Computer Networks

Data Transmission Media

Data Transmission

Network Topology The network topology defines the way in which computers, printers, and other devices are connected. A network topology describes the layout of the wire and devices as well as the paths used by data transmissions. Introduction to Computer Networks

Bus Topology Commonly referred to as a linear bus, all the devices on a bus topology are connected by one single cable. Introduction to Computer Networks

Star & Tree Topology The star topology is the most commonly used architecture in Ethernet LANs. When installed, the star topology resembles spokes in a bicycle wheel. Larger networks use the extended star topology also called tree topology. When used with network devices that filter frames or packets, like bridges, switches, and routers, this topology significantly reduces the traffic on the wires by sending packets only to the wires of the destination host.

Ring Topology Introduction to Computer Networks A frame travels around the ring, stopping at each node. If a node wants to transmit data, it adds the data as well as the destination address to the frame. The frame then continues around the ring until it finds the destination node, which takes the data out of the frame. Single ring – All the devices on the network share a single cable Dual ring – The dual ring topology allows data to be sent in both directions.

Mesh Topology The mesh topology connects all devices (nodes) to each other for redundancy and fault tolerance. It is used in WANs to interconnect LANs and for mission critical networks like those used by banks and financial institutions. Implementing the mesh topology is expensive and difficult. Introduction to Computer Networks

Network Components Introduction to Computer Networks Physical Media Interconnecting Devices Computers Networking Software Applications

Network Types Two major types of networks Peer-to-peer Client/Server (also called server-based)

Peer-to-Peer Network Guide to Networking Essentials, Fourth Edition39

Peer-to-Peer Networking Peers with no centralized control over shared resources Can share resources with any other computer on network No computer has higher access priority No computer has more responsibility to provide or shared resources Figure shows typical peer-to-peer network Guide to Networking Essentials, Fourth Edition40

Peer-to-Peer Networking Advantages Easy to install and configure No dedicated server Users control own shared resources Inexpensive to purchase and operate No additional equipment or software No dedicated administrators Works best with 10 or fewer users Guide to Networking Essentials, Fourth Edition41

Server-Based Networks Guide to Networking Essentials, Fourth Edition42

Server-Based Networks Server responds to client requests Provide centralized control over resources Servers require faster CPUs, more memory, larger disk drives, and extra peripherals such as tape drives May be dedicated, handling only requests from client communities One or more servers may do centralized verification of user accounts and passwords Guide to Networking Essentials, Fourth Edition43

Answers Computer Network is an interconnection of two or more autonomous computers. LAN Local Area Network. MAN Metropolitan Area Network. WAN Wide Area Network. NIC Network Interfacing Card. Types of n/w Peer-to-Peer Network. Client-Server model network.

Thank You Murugan R Asst. Professor Dept. of Computer Applications MES College Marampally Aluva –