Operating System Mcqs

Page No. 53

Which two of the following are authentication algorithms?


aMAC


bAES


cDAS


dDigital-signature


View Answer MAC

SHA-1 produces __________ bit of hash.


a128


b160


c150


d112


View Answer 160

MD5 produces __________ bits hash data.


a128


b150


c160


d112


View Answer 128

Which of the following is not a stream cipher?


aTwo fish


bRC5


cRC4


dTBONE


View Answer TBONE

What is not an encryption standard?


aAES


bTES


cTriple DES


dDES


View Answer TES

What is cipher-block chaining?


aData is logically ‘ANDed’ with previous block


bData is logically ‘ORed’ with previous block


cData is logically ‘XORed’ with previous block


dNone of the mentioned



What is not a role of encryption?


aIt is used to protect data from unauthorized access during transmission


bIt is used to ensure user authentication


cIt is used to ensure data integrity


dIt is used to ensure data corruption doesn’t happens



What is the preferred way of encryption?


apre shared secret key


busing key distribution center (KDC)


cpublic key-encryption


dsymmetric key


View Answer public key-encryption

The replacement of a bad block generally is not totally automatic because ___________


adata in bad block can not be replaced


bdata in bad block is usually lost


cbad block does not contain any data


dnone of the mentioned



What will happen during the recovery from a failure?


aeach pair of physical block is examined


bspecified pair of physical block is examined


cfirst pair of physical block is examined


dnone of the mentioned



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