Common symptoms of a virus attack.

Q6. What are the common symptoms of a virus attack?

Ans. The following are the common symptoms of a virus attack:

  1. The computer begins to run slowly.
  2. Unusual messages and graphics appear on the screen for inexplicable reasons.
  3. Music not associated with any of the open programs begins to play.
  4. Some program or data files on the computer either become corrupt or are difficult to locate. Read More …

Information security.

Q7. Write a note on information security.

Ans. Information security plays an important role in the growth of e-commerce. It can be defined as a set of rules and regulations that users follow online to ensure that the information they provide is not misused in any way. In other words, information security implies protection of information from illegal access or modification.

What do you understand by SSL?

Q5. What do you understand by SSL?

Ans. The Secure Socket Layer (SSL) is a protocol which ensures that sensitive information can be transmitted safely online. It establishes an encrypted link between a Web server and a browser to ensure the security of the information that is exchanged between the two. Today, millions of websites use SSL to provide protection to their users.

Quarantining a virus.

 Q3.  What do you understand by quarantining a virus?

Ans. Quarantine means keeping the virus in some isolated place on your computer under strict vigilance so that it cannot do further harm to your computer. If you think the program may be a virus, you can send the quarantined virus to the antivirus vendor, where researchers examine it, determine its signature, name and catalog it and release its antidote. Read More …

How does antivirus software work?

Q2. How does antivirus software work?

Ans.  Antivirus software installed in your computer works by finding out whether the virus that has attacked your computer is already known or unknown. If it is a known virus (one that has already been detected and has an antidote written for it), the software looks for the virus’s signature, a unique string of bytes similar to a fingerprint that identifies the virus, and removes it from your computer. Most scanning software is able to detect not only an initial virus but also several of its variants because the signature code usually remains intact.

In the case of new viruses for which no solution has been created, the virus scanning software employs heuristics that look for unusual virus-like activity on your computer. If the program finds any suspected activity, it quarantines the questionable program and broadcasts a warning to you about what the program may be trying to do (such as modifying your Windows Registry).

Precautions to prevent a virus attack on your computer.

Q5. What precautions can you take to prevent a virus attack on your computer?

Ans. You can take these precautions to prevent a virus attack on your computer:

  • Avoiding the temptation to open e-mail attachments and downloads from unreliable sources. Resist the urge to double click everything in your mailbox. If you get an unexpected file attachment, send an enquiry e-mail to its sender. Ask him about the nature and function of the file attachment.
  • Installing a reliable anti-virus scanning software and downloading its updates regularly. Major anti-virus software vendors, including Symantec, Network Associates, Computer Associates, and Trend Micro, provide regular updates. Some vendors also offer a service that automatically retrieves updates on your computer from the company’s website.
  • Installing only licensed software.
  • Scanning files downloaded from the Internet or other external sources.
  • Keeping regular backups of your data.

Name some ways in which viruses can enter your computer.

Q1. Name some ways in which viruses can enter your computer.

Ans. Some of the ways in which viruses can enter your computer are as follows:

  • Opening documents with infected e-mail attachments.
  • Downloading infected wallpapers and software from the Internet.
  • Installing infected software.
  • Attaching infected external devices, such as CD or Universal Serial Bus (USB) drive.
  • Visiting dubious websites.

Characteristics of a computer virus.

Q2. List the some common characteristics of a computer virus.
Ans.
Common characteristics of a computer virus are as follows:

  1. Ability to attach itself to another program or file.
  2. Require an external action to activate itself. 
  3. Can replicate itself.