Operating System Mcqs

Page No. 49

Which of the following are forms of malicious attack?


aTheft of information


bModification of data


cWiping of information


dAll of the mentioned


View Answer All of the mentioned

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


aWe can stop DOS attack completely


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


cDOS attack has to be stopped at network level


dSuch attack can last for hours



What is known as a DOS attack?


aIt is attacked to block traffic of network


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


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


dNone of the mentioned



What are zombie systems?


aAre specific system which are designed to attack by manufacturer


bThey are network of known hacking group


cThese systems are previously compromised independent systems


dNone of the mentioned



Which is not a valid port scan type?


aACK scanning


bWindow scanning


cIGMP scan


dFIN scanning


View Answer IGMP scan

Which is not a port scan type?


aTCP scanning


bSYN scanning


cUDP scanning


dSYSTEM Scanning


View Answer SYSTEM Scanning

What is port scanning?


aIt is a software used to scan system for attack


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


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


dNone of the mentioned



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


aRobert Morris


bBob Milano


cMark zuckerberg


dBill Gates


View Answer Robert Morris

What is known as masquerading?


aWhen one participant in communication pretends to be someone else


bWhen attacker modifies data in communication


cWhen attack is of fraudulent repeat of a valid data


dWhen attack gains access to remote systems



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


aVirus destroy and modify user data


bVirus is a standalone program


cVirus is a code embedded in a legitimate program


dVirus cannot be detected



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