Page 402 - Computer Science Class 11 With Functions
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2. Firewall: A firewall is a piece of hardware, software, or a combination of both that prevents unwanted access to a
network. It keeps track of incoming and outgoing network traffic and makes decisions about which traffic to allow
or deny in accordance with a set of security rules. Fig 15.8 depicts a wall between computer and the virus.
Fig 15.8: Firewall
3. Before using a site, check its security: Browse only those websites that use HTTPS (HyperText Transfer Protocol
Secure). Fig 15.9 shows the Google welcome page having https status signifying the secure communication between
the user’s browser and the web server. When you visit a website that employs HTTPS, the server utilises a certificate
to demonstrate the website’s legitimacy to browsers. A web browser may warn you if a website does not use HTTPS
certification.
Fig 15.9: Google welcome page with https status.
4. Use antivirus software: Today’s antivirus software provides protection against viruses, malware, and spyware. But
you must keep your antivirus software up to date to safeguard your computer against hazardous viruses and other
threats. Fig 15.10 shows the windows security essentials scanning the systems for viruses and threats.
Fig 15.10: Windows security essentials scanning the systems for viruses and threats.
400 Touchpad Computer Science-XI

