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
Correct answer
Explanation
The correct answer is A, Preventing unauthorised access to computer via the internet. A firewall stands between a computer or private network and the outside world and blocks traffic that is not allowed.
A firewall works like a security guard at a gate. It inspects every packet of data coming in or going out and compares it with a set of rules: which addresses, ports and programs may connect. Traffic that breaks the rules is dropped. Firewalls can be software, such as the one built into Windows, or hardware devices placed at the edge of an office network. Packet-filtering, stateful-inspection and proxy firewalls are the common types. A firewall controls access; it does not clean files that are already infected.
Option B is wrong because installing harmful software is what malware does, the very thing a firewall tries to stop. Option C is wrong because recording every action is the job of a keylogger or activity log. Option D is wrong because scanning for viruses is the job of antivirus software.
Exam tip: firewall = controls network access; antivirus = detects and removes malware.
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 among the following is a malicious software?
- A.Hacking
- B.Password Cracking
- C.Trojan Horse
- D.Firewall
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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.
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.
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