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Sunday, May 25, 2014

Download Top 7 Free Antivirus 2014

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Here is a list of  a comparative grading of World's Most Popular Free Antivirus Solutions. This list of results was published by PCMAG, after a series of tests in PCMAG's Labs.

Here is a list of Top Most Popular and Competent Free Antivirus Software as shown and rated by Different Popular Online Software Collection Providers like, Softpedia, Snapfiles.com and Cnet.com along with PCMAG.

So, Download Your Selected Antivirus from the Following List of  Top 7 Free Antivirus software of 2014:

1. AVAST


World’s most-trusted antivirus

avast! now protects over 200 million PCs, Macs, and Androids globally – more than anyone else. Download avast! 2014 free today!

2. AVG


Get our essential award-winning

free protection now


AVG AntiVirus FREE 2014Free Download

3. AVIRA


 

Avira Free Antivirus
Effortless protection for virus-free devices

 Download Avira Antivirus Free 2014

4. BitDefender


 

Trust Bitdefender Security Technologies
500 million users already do

Download Bitdefender Antivirus Free Edition 2014

5. COMODO


 Free Firewall and Antivirus
Business Firewall & Antivirus
Endpoint Security Manager 3.0

Network protection that allows you to manage centrally and improve performance and profitability.

Download Comodo Free Antivirus Solutions

6. PANDA CLOUD ANTI VIRUS

 

Our antivirus products
take care of your computer.
We take care of you.
DOWNLOAD Panda CLOUD Antivirus 2014.

7.  Sophos


 

Virus Removal Tool

Our free Virus Removal Tool is a quick and easy way to find and get rid of any threats lurking on your computer. Our tool identifies and cleans up infections your antivirus might have missed.
  • Removes viruses, Conficker, rootkits and fake antivirus
  • Supports Windows XP SP2 and up
  • Works alongside your existing antivirus

Download Free Sophos Antivirus Tools

 

 

Download Top 7 Best Free Antivirus Software 2014

Vendor Detection Cleaning Protection False Positive Performance Overall Grading
AVAST 4 5 4 5 4 22
AVG 4 0 2 5 4 15
Avira 5 5 5 4 3 22
BitDefender 5 5 5 5 5 25
Comodo 1 0 5 2 2 10
Panda 3 5 4 2 3 17
Sophos 5 5 5 5 5 25
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Tuesday, May 13, 2014

Advantages Disadvantages of Fiber Optic Cables

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What is a Fiber Optic Cable?

A Fiber Optic cable comes with the technology that uses glass threads called fibers to transmit data as pulses of light. A fiber optic cable consists of a bundle of glass threads, each of which is capable of transmitting messages modulated onto light waves.
A Fiber Optic Cable transmits data as pulses of light through tiny tubes of glass. A Fiber Optic cable has a very narow strand of glass like human hair.

 What is Bandwidth of a Fiber Cable?

 Modern fiber cables can contain up to a thousand fibers in a single cable, with potential bandwidth in the terabytes per second. 


Advantages of fiber Optic Cables


  1. Fiber Optic cables are used to create very high speed networks.
  2. Fiber Optic cables come with a very high information carrying capacity.
  3. Electromagnetic waves cannot disturb the data passing through the Fiber Optic cables.
  4. Fiber Optic Cables provide a more reliable and secure data transmission.

Disadvantages of Fiber Optics


  1. Fiber Optic cables are very Expensive. Therefore Fiber Optic may be used only if we need a very high speed data transfer network in large organizations. Small organizations my not afford Fiber Optic networks.
  2. A Fiber Optic media is difficult to install.
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Monday, May 5, 2014

Uses of Communication Technologies

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Following are the main uses of Communication Technologies:

1. Video Conferencing


Video Conferenccing combines the computer communication capabilities with video technologies to conduct an online meeting between two or more distant participants. The participants of a Video Conferencing are normally at different geographical locations within a building like a university campus or within a city at different branch offices of an organizaion in a city.


If the communication technology is supported with high speed internet, the participants may in different cities or even in different countries of the world.

Uses of Video Conferencing


  1. Online Meetings
  2. Online Job Interviews
  3. Technical Support
  4. Distance Learning
Requirements for Video Conferencing

It requires:
  1. A P-IV computer
  2. Microphone
  3. Speakers
  4. Video Cameras
  5. Communication Devices
  6. Communication Software
  7. High Speed Broad Band Internet 

2.   Voice Mail


Voice Mail works as an answering machine.

 The caller may leave a voice message. The computer records the voice message and stores it in a Voice Mail Box in its storage.

3.   E-Mail


E-Mail stands for Electronic Mail. E-Mail is used to transfer text messages optionally along with files or documents. Every user has a unique E-Mail Address.

Normally E-Mail Technology uses Local Area Networks or Internet as commuincation channels to transmit messages.

4.   Instant Messaging


Instant Messaging or IM uses some communication software and User IDs to allow users to communicate and exchange their messages while they are online at the same time and using the same communication software at the same time.


Popular communication software include MSN Messenger, Yahoo Messenger, AOL Messenger etc.

5.  FAX


FAX Machine is used to send and recieve important copies of written text or images on paper. A FAX Modm can also be used to send and recieve Fax through Internet. A FAX may be a hand written text or a printed paper.

The Fax sent by Computer FAX Modem and Internet is economical than sending FAX through FAX Machine.

6.  Internet Telephony


Internet Telephony is a facility to talk with people at distant locations with the help of internet and Communication Devices and Software. Internet Telephony is more economical and chepaer way to talk to your friends and relative residing in other countries.

 You must have a good computer with microphone, speakers, communication devices and internet. In fact, Internet Telephony uses a communication Technology called Voice Over Internet Protocol or Voice over IP or VoIP.

7. Chat Rooms


Chat Rooms are used to chat with known or anonymous people in real time while they are online. A Chat Server and chat software is used to provide the facility of text chat, voice chat or even video chat to people.

8. Global Positioning System ( GPS )


GPS or Global Positioning System consists of 24 setellites and one or more earth based recievers that receive and analyse signals sent by setellites to find the exact location of the reciever. A GPS reciever may be a hand held device. A GPS receiver device may be mounted on a car, airoplane, boat, mobile phone or such objects.

Uses of GPS

  1. A Global Positioning System  is used to locate a person or object.
  2. A GPS system is used to find the shortest and best path between two points ( even on a map )
  3. A GPS system may also be used for Intelligence purpose by agencies to monitor the movement of an object or a person.
  4. A GPS system is also being used to find out the location of stolen objects like vehicles, computers, and mobile phones etc.

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Friday, May 2, 2014

Memory and Virtual Memory Management

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What is Memory Management?

One of the main functions of Operating systems is Memory Management. Memory Management may be defined as the process of managing the optimal use of main memory that is RAM (Random Access Memory). RAM is much faster than hard disk. So RAM is used to store data and instructions temporarily while they are being executed by CPU ( Central Processing Unit or PROCESSOR ). CPU can get data and instructions from RAM much faster that from hard disk. As we know CPU is a very very fast device. It may execute billions of instructions per second. CPU will have to wait for data and instruction from hard disk because getting data from hard disk is very slow. That is why RAM is used. So data and instructions needed for execution are brought into main memory that is RAM first. Now RAM provides data and instructions to CPU rapidly.

Operating System allocates the required memory are in main memory to programs that are a candidate for execution. The allocated memory area will be de-allocated when the program will finish execution.



What is Virtual Memory?

Some times, main memory that is RAM is not enough to run larger programs. In this case, some operating systems apply the technique of VIRTUAL MEMORY to overcome the problem of small RAM.  The operating system uses a particular area of hard disk as additional RAM (virtually). The most wanted part of the program in execution may be kept in RAM while the remaining part of that program may on the particular part of the hard disk. This is called Virtual Memory. The area of hard disk used for virtual memory is called a SWAP file. The Swap file is used to exchange data and instructions of a running program between RAM and Hard disk.





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