WHAT IS A FIREWALL ?

A firewall is a part of a computer system or network that is designed  to block unauthorised access while permitting outward communication. Firewalls can be implemented in both hardware and software , or combination of both . A firewall is a dedicated appliance or software running on computer which inspects network traffic passing through it and defines or permits passage based on a set of rules . There are several types of firewall techniques available , they are the followings Packet-filter It looks each packet entering or leaving the...

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STRUCTURE OF LINUX

Linux is a free os which was created by Linus Torvalds at the university of Helsinky in 1991. Torvalds  started linux by creating its kernel partially by using publically available softwares , Then he release the system to his friends , to the internet and asked them to work with it and enhance it. Today 100’s of software developers around the world contributing software to the linux support. Source code of linux operating system is free. Software available for linux was developed by GNU software FSF (free software foundation ) .Structure...

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INTRODUCTION TO LINUX

Linux is a free operating system  which was created by Linus Torvalds at the university of Helsinky in 1991. Torvalds  started linux by creating its kernel partially by using publically available softwares , Then he release the system to his friends , to the internet and asked them to work with it and enhance it. Today 100’s of software developers around the world contributing software to the linux support. Source code of linux operating system is free. Software available for linux was developed by GNU software FSF (free software foundation )...

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WHAT IS CLOUD COMPUTING ?

Cloud computing is a general term for anything that involves delivering hosted services over the internet .cloud computing is the use of computing resourses such as hardware and software that are delivered as a service over a network typically the internet. The cloud in cloud computing can be defined as the set of hardware ,networks,storage,services and interfaces that combine to deliver aspects of computing as a service . cloud services include the delivery of software , infrastructure and storage over the internet based on user demand.    These...

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SYMPTOMS OF COMPUTER VIRUSES

Dear  friends in this session we are discussing the points that helps  us to identify  the presence  of computer viruses  in our computer system . The following steps help you to identify the presence of  computer viruses The computer is slow and takes longer times to load because the computer resources are being used by computer viruses Abnormal write protect errors on certain files which prevent you from deleting or modifying it Antivirus software is blocked and not run at all Strange error message prompt...

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HOW TO PREVENT COMPUTER VIRUSES

Dear  friends in this session we are discussing the points that helps  us to prevent  the attack of computer viruses . The following steps help you to protect your computer system by preventing computer viruses Install a reliable and powerfull Antivirus software , this will help us to prevent the attack of viruses Never open Email attachments without scanning them first , because email attachments are the most common way the virus are spread through internet Update your Antivirus at proper times Try to stay away from cracked softwares ...

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WHAT IS A ANTIVIRUS

Antivirus software are programs which can detect , prevent and clean up computer viruses which may attempt to infect your computer system. It will scan downloaded files as well as your entire computer system in order to detect  the presence of an infection. Or in other words we can say An Antivirus is a protective software designed to defend your computer system against malicious software or malware  include viruses , Trojans, hijackers etc.The Antivirus software provide real time protection , which means antivirus program protect...

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WHAT IS ARTIFICIAL INTELLIGENCE

Artificial Intelligence is the branch of computer science which deals with the study of man made computational devices and systems which can be made to act in a manner which we would be inclined to call intelligent. Alan Turing is Known as the father of Artificial Intelligence . Artificial Intelligence generally involves borrowing characteristics  from human intelligence , and applying them as algorithms in a computer  friendly way . A more or less flexible or efficient  approach can be taken depending on the requirements established,...

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ESSENTIAL WINDOWS COMMANDS

Dear friends in this session we are going to learn some important commands that helps us to perform certain tasks . The following commands helps you to perform ceratin task very simply and easily . The very essential windows commands are Add or Remove Programs       : Start à Run à  appwiz.cpl Internet Explorer Settings       : Start à Run à  inetcpl.cpl Windows Registry Editing       : Start à Run à  regedit.exe Open Task Manager                ...

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HOW TO INCRESE THE SPEED OF A COMPUTER SYSTEM

Make Sure  That Your Computer Hardware is Sufficient Free Up Disk Space By Performing Disk Clean up Perform Disk Defragmentation To Increase Data Access Speed Remove Spyware And Help Protect Your Computer  From Viruses Uninstall Unwanted Softwares And Programs Adjust Visual Effects for Better Performance Install a Effective Anti-Virus Software And Scan For Viruses Disable Unnecessary Windows Services Clean Your Desktop Delete Cookies ,Cache And Internet History From Web Browsers ...

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WHY WE CANT CREATE A FOLDER NAMED CON ?

In Ms Dos several special  device files were available to aid in performing certain tasks, such as clearing the screen or deleting extraneous output from a program. In order to maintain backwards-compatibility , all versions of windows up to and including  windows 7 will refuse to allow you to create a file with these   “reserved device file names “ . The following names are reserved         CON , PRN , AUX , NUL , COM1 , COM2 , COM3 , COM 4 , COM 5, COM6 , COM7 , COM8 , COM9 ,LPT1 ,...

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HOW COMPUTER VIRUS SPREAD

A Computer Virus is a computer program that can replicate itself and spread from one computer to another . In this Section we can find out how the computer viruses spread , the most common ways of  computer virus spreading are ·        Through Email Attachments , it’s the most common way of virus spreading ·        Through Computer Networks , such as peer to peer network , local area network , wan , wireless network  etc ·        Through...

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WHAT IS A COMPUTER VIRUS

A Computer Virus is a computer program that can replicate itself and spread from one computer to another . Otherwise we can say computer viruses are small software programs that are designed to spread from one computer to another and to interfere with computer operation. Depends on the nature of a computer virus it may cause damage to your computer system. In most cases if a file that contain virus  is executed or copied onto another computer ,then that computer will also be infected by the same virus. A virus program contains instructions...

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HOW TO INCRESE YOUR INTERNET SPEED

Dear friends today we are going to learn how to increase the speed of our internet connection . Microsoft reserves 20% of our available bandwidth for their own purposes like windows update . we can get it back Start à Run àgpedit.msc à Local Computer Policy à Computer configurationàAdministrative Templates à Network à Qos packet Scheduler à Limit Reservable Bandwidth , Double click on Limit Reversable bandwidth and select Enabled Option and set Bandwidth limit as 0 , Then Apply à Ok After...

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HOW TO ENABLE OR DISABLE SWITCH USER MODE IN WINDOWS XP AND 7

IN WINDOWS XP To Enable Start à Controll Panel à User Accounts à Change the way users logon or log off àTick use fast user switching à Apply option To disable Start à Controll Panel à User Accounts à Change the way users logon or log off àUntick use fast user switching à Apply option IN WINDOWS 7 To Enable Start à Run à gpedit.msc à Local Computer Policy à Computer Configuration àAdministrative Templates à System...

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WHAT IS A COMPUTER SYSTEM

Computer is a data processing machine which can store , process and retrieve data when ever desired . OR simply we can say ...... C : commonly  O: operating  M: machine    P: particularly    U: used for    T: technical   E: education and   R: researchfather of computer : CHARLES BABBAGE   Charles Babbage , a British mathematics professor is regarded as the father of computer. Charles babbage invented a counting machine called the  difference engine. in those days it took...

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