Which among the following is a malicious software?
- A.Hacking
- B.Password Cracking
- C.Trojan Horse
- D.Firewall
Correct answer
Explanation
The correct answer is C, Trojan Horse. A Trojan is a program that looks useful or harmless but secretly carries harmful code, so it is a piece of malicious software, or malware.
The name comes from the wooden horse of Greek legend that hid soldiers inside to enter the city of Troy. In the same way, a Trojan arrives disguised as a game, a free tool or an email attachment, and once the user runs it, it can steal passwords, open a backdoor for an attacker or install other malware. Unlike a virus or a worm, a Trojan does not copy itself; it depends on the user being tricked into installing it. Other kinds of malware include viruses, worms, spyware, adware and ransomware.
Option A is wrong, because hacking is an activity, gaining unauthorised access to a system, not a software program. Option B is wrong, because password cracking is also a technique of guessing or recovering passwords. Option D is wrong, because a firewall is a security tool that filters network traffic to keep attacks out.
Exam tip: virus needs a host file, worm spreads by itself, Trojan relies on disguise.
Practice Questions
View allWhich language uses the symbolic representation of machine codes needed to program a particular processor or processor family?
- A.Machine Language
- B.Assembly Language
- C.High-Level Language
- D.All of the above
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Assembly language replaces the binary machine codes of a processor with short symbols called mnemonics, such as MOV, ADD and JMP.
Read the full explanation →Which one of the following is the characteristic of Artificial Intelligence ?
- A.Replicates human decision making
- B.Stores relevant information
- C.Stores similar kind of data for a specific purpose
- D.Allows user to interact with media
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Artificial Intelligence is the ability of a machine to perform tasks that normally need human intelligence, such as reasoning, learning and taking decisions.
Read the full explanation →What is an interactive combination of text, graphics, video, audio and images termed as ?
- A.JPEG
- B.Multimedia
- C.AVA
- D.PNG
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Multimedia means using several forms of media, such as text, graphics, audio, video, images and animation, together, often in a way the user can interact with.
Read the full explanation →Which one of the following is not an application software?
- A.Spreadsheet
- B.AutoCAD
- C.MS PowerPoint
- D.Linker
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A linker is system software, a programming tool that joins compiled pieces of code into one program that can run; it does not do a task for the end user.
Read the full explanation →Which one among the following is the purpose of firewall?
- A.Preventing unauthorised access to computer via the internet
- B.Installation of software that can harm the computer
- C.Recording everything that is done on computer
- D.Running checks to prevent virus attacks
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A firewall stands between a computer or private network and the outside world and blocks traffic that is not allowed.
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