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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Why would a hacker use a proxy server?
Answer: D
Correct answer: To hide malicious activity on the network.
Traffic sent through a proxy appears to come from the proxy, so the attacker's own address does not appear in the target's logs. Chaining several proxies makes tracing back harder still.
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…………………….. is a form of virus explicitly designed to hide itself from detection by antivirus software.
Answer: C
Correct answer: Stealth virus
A stealth virus is built to conceal itself - intercepting the calls antivirus software makes so that infected files appear unchanged in size and content. Polymorphism also frustrates detection, but by changing the virus's own appearance rather than by hiding the evidence of infection.
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All of the following are examples of real security and privacy threats except:
Answer: C
Correct answer: Spam
Hackers, viruses and worms each threaten security directly. Spam is unsolicited advertising - a nuisance, and often the vehicle for the others, but not in itself a security threat.
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A …………………….. creates copies during replication that are functionally equivalent but have distinctly different bit patterns.
Answer: A
Correct answer: Polymorphic Virus
A polymorphic virus encrypts itself with a different key each time it copies itself, so every copy does the same thing while having a different bit pattern. That is what defeats signature-based scanning, which looks for a fixed sequence of bytes.
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VIRUS stands for
Answer: B
Correct answer: Vital Information Resource Under Siege
The usual expansion is Vital Information Resource Under Siege. It is a backronym invented after the fact - the word came from biology - but it is the one these questions expect.
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What is short for malicious software (is software designed to disrupt computer operation, gather sensitive information, or gain unauthorized access to computer systems)?
Answer: D
Correct answer: Malware
Malware is short for malicious software. The other three are invented words.
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