Overview MCQ

Test your knowledge with important Overview MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Overview MCQs at Bissoy

• Loopback address is given by:
  ক

  0.0.0.0

  খ

  127.x.x.x

  গ

  255.255.255.255

  ঘ

  None of the mentioned
• SSID stands for
  ক

  Secure Service Identifier

  খ

  Secure Set Independent Device

  গ

  Secure Set Identifier

  ঘ

  Service Set Independent Device
• An HTTP connection uses port __________ whereas HTTPS uses port __________ and invokes SSL.
  ক

  40; 80

  খ

  60; 620

  গ

  80; 443

  ঘ

  620; 80
• In the SSL record protocol operation pad_1 is :
  ক

  is the byte 0x36 repeated 40 times for MD5

  খ

  is the byte 0x5C repeated 40 times for MD5

  গ

  is the byte 0x5C repeated 48 times for SHA-1

  ঘ

  is the byte 0x36 repeated 48 times for MD5
• In the alert protocol the first byte takes the value 1 or 2 which corresponds to ________ and _________ respectively.
  ক

  Select, Alarm

  খ

  Alert, Alarm

  গ

  Warning, Alarm

  ঘ

  Warning, Fatal
• On which port will the server generally listen to for SMTP?
  ক

  port 35

  খ

  port 63

  গ

  port 25

  ঘ

  port 65
• Broadcast address is given by
  ক

  0.0.0.0

  খ

  127.x.x.x

  গ

  255.255.255.255

  ঘ

  None of the mentioned
• The secure authentication connection is referred to as
  ক

  chisel

  খ

  tunnel

  গ

  zeroing

  ঘ

  handshaking
• In which port forwarding technique does the client act on the server’s behalf?
  ক

  Remote Forwarding

  খ

  Local Forwarding

  গ

  Stable Forwarding

  ঘ

  None of the mentioned
• In the IEEE 802.11i PRF, a nonce is generated by the following expression: nonce = PRF (Random Number, “InitCounter”, MAC || Time, Len) What is the value of the ‘Len’ (desirable number of pseudorandom bits)?
  ক

  64

  খ

  128

  গ

  256

  ঘ

  512
• There are a number of possible EAP exchanges that can be used during authentication phase. Typically the message flow between the STA and AP employs the _________ protocol.
  ক

  RADUIS

  খ

  EAPOL

  গ

  TKIP

  ঘ

  KSN
• __________ services are implemented in every 802.11 station, including AP stations. _________ services are provided between BSSs.
  ক

  Station, Distribution

  খ

  Distribution, Station

  গ

  Extended, Basic

  ঘ

  Basic, Extended
• Nsub = n + log2(N/Nsub) is used to find the suffix length.
  ক

  True

  খ

  is used to find the suffix length. a) True [ False
• Reduce the following Big-O notation. O = . b) O. c) O. d) O.
  ক

  = ] O.

  খ

  ax7 + 3 x3 + sin(x)

  গ

  ax7 + 3 x3 + sin(x)

  ঘ

  ax7 + 3 x3 + sin(x)
• 12. For p = 11 and q = 17 and choose e=7. Apply RSA algorithm where Cipher message=11 and thus find the plain text.
  ক

  88

  খ

  122

  গ

  143

  ঘ

  111
• Using SDES, the Plaintext for the Ciphertext 00001111, given that the key is 1111111111 is,
  ক

  01100111

  খ

  00001010

  গ

  11111111

  ঘ

  01101101
• Using Differential Crypt-analysis, the minimum computations required to decipher the DES algorithm is-
  ক

  256

  খ

  243

  গ

  255

  ঘ

  247
• In the DES algorithm the Round Input is 32 bits, which is expanded to 48 bits via ______________
  ক

  Scaling of the existing bits

  খ

  Duplication of the existing bits

  গ

  Addition of zeros

  ঘ

  Addition of ones
• Which function can be used in AES multiplication –
  ক

  m(x)=x7+x4+x3

  খ

  m(x)=x8+x4+x3+x+1

  গ

  m(x)=x8+x3+x2+x+1

  ঘ

  m(x)=x8+x5+x3+x
• The inverse s-box permutation follows, b’i = b(i+2) XOR b(i+5) XOR b(i+7) XOR di Here di is –
  ক

  di is the ith bit of a byte ‘d’ whose hex value is 0x15

  খ

  di is the ith bit of a byte ‘d’ whose hex value is 0x05

  গ

  di is the ith bit of a byte ‘d’ whose hex value is 0x25

  ঘ

  di is the ith bit of a byte ‘d’ whose hex value is 0x51
• In AES, to make the s-box, we apply the transformation – b’i = bi XOR b(i+4) XOR b(i+5) XOR b(i+6) XOR b(i+7) XOR ci What is ci in this transformation?
  ক

  ci is the ith bit of byte c with value 0x63

  খ

  ci is the ith bit of byte c with value 0x25

  গ

  ci is the ith bit of byte c with value 0x8F

  ঘ

  ci is the ith bit of byte c with value 0x8A
• Division of (131B6C3) base 16 by (lA2F) base 16 yeilds
  ক

  1AD

  খ

  DAD

  গ

  BAD

  ঘ

  9AD
• The plain text for the cipher text RRLMWBKASPDH. Given the encryption key is –
  ক

  is – ] PAYMOREMONEY

  খ

  (17 17 5 | 21 18 21 | 2 2 19)

  গ

  (17 17 5 | 21 18 21 | 2 2 19)

  ঘ

  (17 17 5 | 21 18 21 | 2 2 19)
• On Encrypting “thepepsiisintherefrigerator” using Vignere Cipher System using the keyword “HUMOR” we get cipher text
  ক

  abqdnwewuwjphfvrrtrfznsdokvl

  খ

  abqdvmwuwjphfvvyyrfznydokvl

  গ

  tbqyrvmwuwjphfvvyyrfznydokvl

  ঘ

  baiuvmwuwjphfoeiyrfznydokvl
• Maurer’s Universal Statistical Test is
  ক

  a test to determine whether the number of runs of ones and zeros of various lengths is as expecte

  খ

  a test to detect if a sequence can be significantly compressed without loss of information

  গ

  a test to determine whether the number of ones and zeros in a sequence is approx the same as in a truely random o/p

  ঘ

  a test for the check of evenness in the 1s and 0s
• The GCD of x5+ x4+ x3– x2 – x + 1 and x3 + x2+ x + 1 over GF(3) is
  ক

  1

  খ

  x

  গ

  x + 1

  ঘ

  x2 + 1
• Multiply the polynomials P1 = (x5 + x2 + x) by P2 = (x7 + x4 + x3 + x2 + x) in GF(28) with irreducible polynomial (x8 + x4 + x3 + x + 1). The result is
  ক

  x4+ x3+ x+1

  খ

  x5+ x3+ x2+x+1

  গ

  x5+ x4+ x3+x+1

  ঘ

  x5+ x3+ x2+x
• The last two blocks of the XTS-AES mode are
  ক

  padded as 10*

  খ

  encrypted/ decrypted using ciphertext-stealing

  গ

  padded as 10*1

  ঘ

  padded and then swapped after encryption/ decryption
• The blowfish algorithm’s key expansion converts a key of at most 448 bits into several subkey arrays totaling ___ bytes.
  ক

  4096

  খ

  4608

  গ

  4168

  ঘ

  4864
• A total of seven messages are required in the Public-Key distribution scenario. However, the initial five messages need to be used only infrequently because both A and B can save the other’s public key for future – a technique known as ____________
  ক

  time stamping

  খ

  polling

  গ

  caching

  ঘ

  squeezing