Basic CS-Networks [TCS Placement]: Sample Questions 116 - 117 of 133

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Question 116

Networks
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Describe in Detail

Essay▾

What is CRC?

Explanation

  • The cyclic redundancy check (CRC) detects errors in digital data using hash function.
  • Used in digital networks and storage devices such as hard disk drives.
  • Invented by W. Wesley Peterson in 1961 and further developed by the CCITT (Comite Consultatif International Telegraphique et Telephonique) .
  • Quite simple to implement in hardware and can be easily analyzed mathematically.
  • Based on binary division
  • Also called polynomial code checksum.
  • Given a k-bit frame or message, the transmitter generates an n-bit sequence, known as a frame check sequence (FCS) , so that the resulting frame, consisting of (k + n) bits, is exactly divisible by some predetermined number.
  • The receiver then divides the incoming frame by the same number and, if there is no remainder, assumes that there was no error.
Given the Image is Define the Cycle Redundancy Check
Given the Image is Define the CRC Example

Question 117

Networks
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Describe in Detail

Essay▾

Difference between bit rate and baud rate

Explanation

Difference between Bit Rate and Baud Rate
Bit rateBaud rate
Number of bits transmitted during one secondNumber of signal units per second that are required to represent the bit send in one second.
Determines the number of bits traveled per second.Determines how many times the state of a signal is changing.
Emphasis is on computer efficiency.Data transmission over the channel is primary concerned.
Cannot determine the bandwidth.Can determine how much bandwidth is required to send the signal.
Baud rate =

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