Basic CS-Networks [TCS Placement]: Sample Questions 91 - 93 of 133

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Question 91

Networks
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Write in Short

Short Answer▾

How can you turn-on and turn-off CAS?

Explanation

  • Code Access Security Tool (Caspol. exe) can be used to turn security on and off.
  • caspol -security off turns off security
  • caspol -security on turns on security
  • In the . NET Framework 4.0, for using Caspol. exe < LegacyCasPolicy > element must be set to true.

Question 92

Networks
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Write in Short

Short Answer▾

What is fixed size framing?

Explanation

  • Frames are used as they increase reliability- a message packed in one frame would require retransmission of the whole message even on a single-bit error.
  • Frames can be of fixed or variable size. In fixed-size framing, there is no need for delimiter at boundaries.
  • Ex: ATM wide-area network uses frames of fixed size called cells.

Question 93

Networks
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Describe in Detail

Essay▾

What are the functions of the Physical layer?

Explanation

Coordinates the transmission of bit stream over a physical medium.

  • Interface

    Defines the transmission interface between devices and transmission medium.

  • Representation of bits
    • Data consists of stream of bits which are encoded into signals for transmission.
    • Defines type encoding i.e.. . how 0՚s and 1՚s are changed to signal.
  • Data rate

    Defines the rate of transmission- the number of bits per second.

  • Synchronization of bits

    Deals with synchronization of the transmitter and receiver. Sender and receiver are synchronized at bit level.

  • Link configuration

    Connects devices with the medium through point-to-point or multipoint configuration.

  • Topology

    Devices can be connected using following topologies: mesh, star, ring, or bus.

  • Transmission mode

    Defines the direction of transmission between two devices: simplex, half-duplex, or dull duplex.

  • Deals with baseband and broadband transmission.

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