To check integrity of a message, or document, receiver creates the
Answer: B
Correct answer: Finger Print
The receiver computes the hash of the document it has received - its fingerprint - and compares it with the fingerprint sent with the document. If the two agree, nothing has been altered.
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One way to preserve integrity of a document is through use of a
Answer: B
Correct answer: Finger Print
A hash of the document, called its fingerprint, is short, fixed in length, and changes completely if a single bit of the document changes - which is what makes it a check on integrity.
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In …………….., the virus places an identical copy of itself into other programs or into certain system areas on the disk.
Answer: C
Correct answer: Propagation phase
Propagation is the phase in which the virus writes copies of itself into other programs or into system areas of the disk. The dormant phase is idleness, the triggering phase is the event that wakes it, and the execution phase is the payload.
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Message digest needs to be
Answer: C
Correct answer: kept secret
If the digest travelled openly alongside the message, an attacker could alter the message and recompute the digest to match. The digest must therefore be protected - kept secret, encrypted, or bound to a key - or the whole check is worthless.
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To protect yourself from computer hacker, you should turn on a
Answer: A
Correct answer: Firewall
A firewall inspects traffic entering and leaving the machine and blocks connections that are not permitted, which is what keeps an intruder from reaching the computer at all. Antivirus software deals with malicious code already present rather than with the connection.
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Which of the following describes programs that can run independently travel from system to system and disrupt computer communication?
Answer: B
Correct answer: Worm
A worm is distinguished from a virus precisely by independence: it needs no host program and no user action, but propagates itself across a network, and the traffic it generates is what disrupts communication. Trojans do not self-propagate, and a dropper merely installs other malware.
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In Message Integrity, message digest needs to be kept
Answer: A
Correct answer: Secret
The same reason: a digest an attacker can replace gives no protection, since the altered message would carry a correctly computed digest. Keeping it secret, or computing it with a secret key, is what makes the check meaningful.
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What is a firewall?
Answer: C
Correct answer: A filter for an internet connection that monitors outgoing and incoming activity
A firewall works on connections, allowing or blocking traffic in both directions according to its rules. It is not concerned with the content of files, which is what antivirus software examines, and the name is a metaphor rather than a description.
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A ------- is a computer program that can invade computer and perform a variety of functions ranging from annoying(e.g. popping up messages as a joke) to dangerous (e.g. deleting files)
Answer: A
Correct answer: Computer Virus
A virus is code that attaches itself to a host program, spreads when that program runs, and carries a payload that may be trivial or destructive. Antivirus software is what opposes it, and Word and Access are ordinary applications.
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McAfee is an example of
Answer: C
Correct answer: Antivirus
McAfee is one of the long-established antivirus products, alongside Norton, Avast and AVG. Quick Heal is another antivirus rather than a category, which is why it cannot be the answer to a question about what kind of thing McAfee is.
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