TCS Placement: Sample Questions 289 - 290 of 502

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Question 289

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Describe in Detail

Essay▾

What are the types of errors?

Explanation

There are two types of error

Single-Bit error

  • Only one bit of given data unit (such as a byte, character, or data unit) is changed from 1 to 0 or from 0 to 1.
  • Least likely type of errors in serial data transmission but can happen in parallel data transmission- for example, if 16 wires are used to send all 16 bits of a word at the same time and one of the wires is noisy, one bit is corrupted in each word.
Given the Image is Define the Single-Bit Error

Burst Error

  • Two or more bits in the data unit have changed from 0 to 1 or vice-versa.
  • doesn՚t necessary occur in consecutive bits.
  • The length of the burst error is measured from the first corrupted bit to the last corrupted bit. Some bits in between may not be corrupted.
  • Burst errors are mostly likely to happen in serial transmission where duration of the noise is normally longer than the duration of a single bit, which means that the noise affects many bits of data.
Given the Image is Defining the Burst Error

Question 290

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Describe in Detail

Essay▾

What are the responsibilities of Application Layer?

Explanation

  • Application Layer enables access to the network.
  • It provides user interfaces and support for services such as e-mail, shared database management and other types of distributed information services, like:
    • Network virtual terminal

      Allows user to log on to a remote host.

    • File Transfer, Access and Management (FTAM)

      Standard mechanism to access and manage files via remote computer.

    • Mail services

      Provides e-mail forwarding and storage.

    • Directory Services

      Provides access for global information about various services.

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