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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