your home by purchasing a hardware firewall with NAT capabilities. Many routers
sold for home use are also configured as firewalls, and many feature NAT.
7.11 Explain how to protect your computer from virus infection.
• Antivirus software
• Detects viruses and protects your computer
• Popular programs:
Symantec, Kaspersky, AVG, McAfee
Antivirus software is specifically designed to detect viruses and protect your
computer and files from harm. Symantec, Kaspersky, Trend Micro, and McAfee are
among the companies that offer highly rated antivirus software packages. Antivirus
protection is also included in comprehensive Internet security packages such as
Norton Security, Trend Micro Internet Security, and McAfee Total Protection. These
software packages also help protect you from threats other than computer viruses.
For example, Windows 10 includes Windows Defender, which defends against
malware as well as viruses. Although antivirus software is designed to detect
suspicious activity on your computer at all times, you should run an active virus scan
on your entire system at least once a week. By doing so, all files on your computer
will be checked for undetected viruses. Current antivirus programs run scans in the
background when your CPU is not being heavily utilized. But you can also configure
the software to run scans at times when you aren’t using your system—for example,
when you’re asleep. Alternatively, if you suspect a problem, you can launch a scan
and have it run immediately.
The main functions of antivirus software are as follows:
• Detection: Antivirus software looks for virus signatures in files. A virus signature
is a portion of the virus code that’s unique to a particular computer virus. Antivirus
software scans files for these signatures when they’re opened or executed and
identifies infected files and the type of virus infecting them.
• Stopping virus execution: If the antivirus software detects a virus signature or
suspicious activity, such as the launch of an unknown macro, it stops the execution
of the file and virus and notifies you that it has detected a virus. It also places the
virus in a secure area on your hard drive so that it won’t spread to other files; this
procedure is known as quarantining. Usually, the antivirus software then gives you
the choice of deleting or repairing the infected file. Unfortunately, antivirus
programs can’t always fix infected files to make them usable again. You should keep
backup copies of critical files so that you can restore them in case a virus damages