Operating System Mcqs

Page No. 49

Which of the following are forms of malicious attack?


aTheft of information

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bModification of data

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cWiping of information

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dAll of the mentioned

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View Answer All of the mentioned

With regard to DOS attack what is not true from below options?


aWe can stop DOS attack completely

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bBy upgrading OS vulnerability we can stop DOS attack to some extent

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cDOS attack has to be stopped at network level

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dSuch attack can last for hours

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What is known as a DOS attack?


aIt is attacked to block traffic of network

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bIt is attacked to harm contents stored in HDD by worm spawn processes

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cIt is an attempt to make a machine or network resource unavailable

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dNone of the mentioned

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What are zombie systems?


aAre specific system which are designed to attack by manufacturer

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bThey are network of known hacking group

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cThese systems are previously compromised independent systems

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dNone of the mentioned

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Which is not a valid port scan type?


aACK scanning

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bWindow scanning

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cIGMP scan

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dFIN scanning

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View Answer IGMP scan

Which is not a port scan type?


aTCP scanning

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bSYN scanning

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cUDP scanning

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dSYSTEM Scanning

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View Answer SYSTEM Scanning

What is port scanning?


aIt is a software used to scan system for attack

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bIt is a software application designed to probe a server or host for open ports

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cIt is software used to scan system for introducing attacks by brute force

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dNone of the mentioned

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Who unleashed famous worm attack in 1988 which effected UNIX systems and caused losses in millions?


aRobert Morris

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bBob Milano

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cMark zuckerberg

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dBill Gates

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View Answer Robert Morris

What is known as masquerading?


aWhen one participant in communication pretends to be someone else

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bWhen attacker modifies data in communication

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cWhen attack is of fraudulent repeat of a valid data

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dWhen attack gains access to remote systems

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Which of the following is not a characteristic of a virus?


aVirus destroy and modify user data

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bVirus is a standalone program

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cVirus is a code embedded in a legitimate program

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dVirus cannot be detected

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