Computer Science Lesson Notes JSS3 Third Term
Scheme of work
Week 1
Topic: Computer Virus
Week 2
Topic: Sources of Computer Viruses
Week 3
Topic: Virus Warning Signs
Week 4
Topic: Virus Detection
Computer science lesson note for jss3
Below are the 2022 complete computer science lesson notes for jss 3 third term
Week 1
Topic: Computer Virus
What is a Computer Virus?
Computer viruses are small software programs that are designed to spread from one computer to another and to interfere with computer operation. A virus might corrupt or delete data on your computer, use your e-mail program to spread itself to other computers, or even erase everything on your hard disk.
Computer viruses are often spread by attachments in e-mail messages or instant messaging messages. That is why it is essential that you never open e-mail attachments unless you know who it’s from and you are expecting it.
A computer virus is a malware program that, when executed, replicates by inserting copies of itself (possibly modified) into other computer programs, data files, or the boot sector of the hard drive; when this replication succeeds, the affected areas are then said to be “infected”.
A computer virus is a program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes. Viruses can also replicate themselves. All computer viruses are man-made. A simple virus that can make a copy of itself over and over again is relatively easy to produce. Even such a simple virus is dangerous because it will quickly use all available memory and bring the system to a halt. An even more dangerous type of virus is one capable of transmitting itself across networks and bypassing security systems.
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Week 2
Topic: Sources of Computer Viruses
The most potent and vulnerable threat of computer users is virus attacks. Virus attacks hampers important work involved with data and documents. It is imperative for every computer user to be aware about the software and programs that can help to protect the personal computers from attacks. One must take every possible measure in order to keep the computer systems free from virus attacks.
The top sources of virus attacks are highlighted below:
- Pirated or Cracked Software – Are you aware of software cracking? Well, every time you open a cracked software, your antivirus software might flag it as a malware as the cracks consist of malicious scripts. Always say “No” to cracks as they can inject malicious script into your PC.
- Downloadable Programs – One of the possible sources of virus attacks is downloadable programs from the web. Unreliable sources and internet newsgroups are one of the main sources of computer virus attacks. Downloadable files are one of the best possible sources of virus. Any type of executable program including games, freeware, screen savers as well as executable files are one of the major sources of computer virus attacks. Executable files having an extension of “.com”, “.exe” and “coolgame.exe” contain virus sources too. If in the case you want to download programs from the internet then it is necessary to scan every program before downloading them.
- Internet – One of the easiest ways to get a virus on your device is through the Internet. Make sure to check URL before accessing any website. For a secured URL always look for ‘https’ in it.
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Week 3
Topic: Virus Warning Signs
Viruses are malicious software – known as malware – that can destroy files, steal personal information and damage your computer.
Here are the top ten signs your PC has a virus.
- Slow start up and slow performance – If your PC is taking longer than normal to start or programs are taking ages to open, then your PC may have a virus. If your computer’s performance is sluggish, check first that it isn’t due to a lack of RAM memory or hard disk space. If not, the culprit may be a virus.
- Applications won’t start – How many times have you tried to run an application from the start menu or desktop and nothing happens? Sometimes another program might even run. This could be another type of problem, but at the very least it’s a symptom that tells you that something is wrong.
- Programs opening and closing automatically – Malware can also be present when your programs are opening and closing automatically. However, do check if some programs are meant to behave this way or if they are simply incompatible to run with your hardware first before coming to the conclusion that your computer has a virus.
- Pop-ups, websites, toolbars and other unwanted programs – These are irritating signs that your computer has a virus. Pop-ups come from clicking on suspicious pages, answering survey questions to access a website’s service or installing free applications. Don’t click on ads where Jane says she earned $8000 a month staying at home. When you get pop-ups appearing out of the blue, refrain from clicking anywhere on the pop-up page and just close out of the window and use your anti-malware tool immediately.
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Week 4
Topic: Virus Detection
An antivirus tool is an essential component of most anti-malware suites. It must identify known and previously unseen malicious files with the goal of blocking them before they can cause damage. Though tools differ in the implementation of malware-detection mechanisms, they tend to incorporate the same virus detection techniques. Familiarity with these techniques can help you understand how antivirus software works.
Antivirus software is a type of utility used for scanning and removing viruses from your computer. While many types of antivirus (or “anti-virus“) programs exist, their primary purpose is to protect computers from viruses and remove any viruses that are found.
Most antivirus programs include both automatic and manual scanning capabilities. The automatic scan may check files that aredownloaded from the Internet, discs that are inserted into the computer, and files that are created by software installers. The automatic scan may also scan the entire hard drive on a regular basis. The manual scan option allows you to scan individual files or your entire system whenever you feel it is necessary.
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