Firewall is a type of ____________.
Answer: D
Correct answer: None of the above
A firewall is a protective measure, not a threat: it filters connections to and from a machine. It is neither a virus, nor a worm, nor a security threat of any kind, so none of the three categories fits.
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A virus that migrates freely within a large population of unauthorized email user is called a -------
Answer: A
Correct answer: macro
A macro virus lives in the macro language of a document rather than in an executable, so it travels wherever documents travel - which in practice means email, freely and among very large numbers of users. It is also platform independent for the same reason, since it needs only the application, not the operating system.
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Which of the following is not an antivirus software?
Answer: D
Correct answer: Code Red
Code Red was a worm that spread through Microsoft IIS web servers in 2001. AVG, Avast and McAfee are all antivirus products, which makes Code Red the odd one out.
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Message must be encrypted at sender site and decrypted at the
Answer: C
Correct answer: Receiver site
Encryption happens where the message originates and decryption where it is read, so the message is in ciphertext for the whole of its journey. That is what protects it in transit.
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Delayed payload of some viruses is also called as
Answer: A
Correct answer: Bomb
A payload that waits for a condition before acting is called a bomb - a time bomb when the trigger is a date, a logic bomb when it is some other event. The delay is what the name refers to.
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Message confidentiality is using
Answer: D
Correct answer: Asymmetric-Key
In an asymmetric system the sender encrypts with the receiver's public key, so only the holder of the matching private key can read the message. That gives confidentiality without the two parties ever having shared a secret in advance.
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To protect a computer from virus, you should install -------- in your computer.
Answer: A
Correct answer: antivirus
Antivirus software scans files and memory for known malicious code and blocks or removes it. Disk defragmenter, disk cleanup and the backup wizard are maintenance tools and offer no protection against infection.
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What is anti-virus?
Answer: A
Correct answer: It is a program code
Antivirus is software - a program that scans files and memory against a database of known threats. The names of the products are company names, but the thing itself is code.
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A digital signature needs a
Answer: C
Correct answer: Public-key system
A digital signature must be creatable by one party alone and verifiable by everyone, which only asymmetric cryptography allows: the sender signs with a private key and anyone can check the signature with the matching public key. A shared key would let either party forge the other's signature.
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How does a Le-Hard virus come into existence?
Answer: C
Correct answer: Command.Com
The Le-Hard virus attaches itself to COMMAND.COM, the DOS command interpreter, which is loaded every time the machine starts and so gives the virus a reliable point of execution.
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