Virus | MCQs

Explanation

A Trap door (or backdoor) is a hidden entry point into a system that bypasses normal authentication, making it a serious security threat.

Unlike viruses or worms, it allows unauthorized access without detection, potentially exposing entire systems.

Explanation

Chrome is a web browser, not antivirus software.

Norton, McAfee, and Avast are all well-known antivirus programs used to detect and remove malware.

Explanation

Boot sector viruses often spread through .exe files, which are executable and can run malicious code when opened.

These files can infect the boot sector when the system starts, making them a common carrier for such viruses.

Explanation

If a computer virus corrupts the File Allocation Table (FAT) on a DOS system, the operating system will be unable to retrieve any data from the disk.

The FAT is a critical data structure that keeps track of the location of files on the disk, and if it becomes corrupted, the system will not be able to access the data.

Explanation

A firewall is a software or firmware that prevents unauthorized access to a network.

A firewall inspects incoming and outgoing traffic using a set of rules to identify and block threats.

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Explanation

Anti-virus software primarily serves to protect against malware and viruses

Its main functions include:

• Detecting and Removing Threats
• Real-Time Protection
• Preventing Future Infections:

Explanation

An antivirus is an: Application software

Antivirus is an example of: security

Explanation

• Viruses, Trojan horses, and worms are malicious software used to harm a computer system.
• A Trojan Horse is a program that allows the attacker to control the user's computer from a remote location.

Additional Information 

• The list below shows some of the activities that the attacker can perform using a Trojan horse:
  • ​Electronic money theft.
  • Modifying files on the user’s computer
  • Damage the user’s computer (crashing, blue screen of death, etc.)
  • Stealing sensitive data such as stored passwords, credit card information, etc.

• A worm is a malicious computer program that replicates itself usually over a computer network.
• A virus is a computer program that attaches itself to legitimate programs and files without the user's consent.
• A computer virus may be used to;
• Access private data such as user id and passwords.
• Display annoying messages to the user.
• Corrupt data on your computer.
• Log the user’s keystrokes.

Explanation

Trojans spreads through a computer network.

Boot Sector Virus spreads floppy disk.

AGM 08-2-2023

Explanation

A hacker is a person skilled in information technology who uses their technical knowledge to achieve a goal or overcome an obstacle, within a computerized system by non-standard means.