Umesh kumar gangwar 1

Created by:

Umesh kumaremkkjnhhm

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Introduction

Features

Parts of Computer

Types of Computer

C-compact& complete.O-operational.M-main operated.P-portable.U-usable.T-time.E-easy.R-reliable.

The computer comes from the word compute

which means to calculate .Hence people

usually consider a computer to be a calculating

device that can perform arithmetic operation at

high speed.

Speed:- Computer can perform billion (109)

arithmetic operation in one second.

Accuracy:-Gives right and accurate

information.

Versatility:- Perform various task.

Diligence:-Free from tiredness.

No Feeling

No IQ

Mouse

Keyboard

Printer

Scanner

Monitor

CPU

Mini computer Super computer

Micro computerMainframe computer

ALU Accumulator

General register

Control Unit

Memory

Auxiliary Memory

InputOutput

Figer 1. Digital computer

CPU

Register

Cache

Main memory

Disk cache

Magnetic disk

Optical disk Magnetic tape

1-2ns

3-50ns

30-90ns

5-20ms

Figer 2. Memory HierarchyOffline

Most costly

System

Less costly

Internet:- Network of networks.

Internet is based upon the need to share information

between two or more computers. This is done by

interconnecting or networking the computers. The

computers may be connected through various media

as optical fibers, telephone lines and satellite systems.

The internet is a decentralized global network of

various networks.

1.LAN (Local Area Network)

2.MAN (Metropolitan Area Network)

3.WAN (Wide Area Network)

SESSION LAYER

APPLICATION LAYERAPPLICATION LAYER

TRANSPORT LAYER

NETWORK LAYER

DATALINK LAYER

PHYSICAL LAYER

PRESENTATION LAYER

SESSION LAYER

TRANSPORT LAYER

NETWORK LAYER

DATALINK LAYER

PHYSICAL LAYER

PRESENTATION LAYER

Request

Internet

Response

ServerClient

Request

Internet

Response

Mail refers to the sending and receiving of documents

in electronic form from one computer to another

computer .Every recipient or user must have an Email

address .This mail address is used to send and receive

the mail . The email is delivered to the inbox of the

user.

Senders ISP

Senders computer

Receivers ISP

Mail server of receivers ISP

Receivers computer

Telephone lines

Internet

If the buying and selling of product’s and other related

activities of business are conducted with the help of

internet then known as Ecommerce .

Other names of ecommerce are:-

1. Electronic trading

2. Electronic business

3. Electronic Marketing

1. B to B (Business to business)

2. B to C (Business to customer)

3. B to G (Business to Government)

*B to B:- business alliance between different companies

for their mutual benefit.

• B to C:- Shopping on internet.

• B to G:- Governments departmental website.

From credit cards and debit cards.

Bank Credit cards processor

Customer Company

Authorization

BillResult of verification

Verification

Credit cards

Fire wall are the hardware or software that are placed

on the gateway.

Fire wall is used to protect the network from the outer

side world against any unauthorized access to the

network.

The most common way to doing to this is by placing a

computer at the gateway , which verifies the

authenticity of the user fire wall is also known as

secure internet gateway.

Fire wallOuter world