Basic CS-Networks [TCS Placement]: Sample Questions 81 - 82 of 133

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Question 81

Networks
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Describe in Detail

Essay▾

What is attenuation?

Explanation

  • The degeneration of a signal with distance on a network cable is called attenuation.
  • As signal travels it losses strength called attenuation. Since received signal strength must be enough to be detected and sufficiently higher than noise to be received without error, communication network must include amplifiers or repeaters at specific intervals to boost the signal strength.
  • The distance a signal can travel before is needs amplification depends on the medium.
  • Attenuation increases as a function of frequency, Equalizers equalize attenuation across a band of frequency.
  • Attenuation occurs with both digital and analog signals.
  • Extent of attenuation is expressed in decibels (dBs) .
  • For guided media, attenuation is generally logarithmic.
  • For unguided media, attenuation is more complex.
Given the Image is Define the Attenuation

Question 82

Networks
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Describe in Detail

Essay▾

What is wide-mouth frog?

Explanation

  • The Wide Mouth Frog protocol is an authentication protocol designed for insecure networks (the Internet for example) .
  • Allows communicators to prove their identity to each other while preventing eavesdropping or replay attacks
  • Provides detection of modification and the prevention of unauthorized reading.
  • It is the simplest known key distribution center (KDC) authentication protocol.
The Wide-Mouth-Frog Protocol (WMF)

Developed by: