3i Infotech Papers: Sample Questions 720 - 721 of 1245

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Question number: 720

» Basic CS » Operating System

Short Answer Question▾

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What is meant by arm-stickiness?

Explanation

  • Arm stickiness is a phenomenon in I/O scheduling where the scheduling algorithm continues to service disk requests at or near the current sector preventing any seeking.

  • This is done out of order, to satisfy the nearby requests first.

  • However, this may cause arm-stickiness- the name derives from the arm controlling the seek head of the disk being struck to a particular part.

    • Processes having high access rate to one track of disk monopolize the device by continues access to the track.

    • Happens with most common device scheduling algorithm.

  • High-density multisurface disks are affected more.

Question number: 721

» Basic CS » Networks

Short Answer Question▾

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What is mesh network?

Explanation

  • Connects network nodes, computer and other devices directly with each another.

  • In true mesh topology, every node is connected to every other node.

  • Commonly used in wireless networks.

  • Flooding or routing technique is used in mesh topology.

    Advantages:

  • Data can be transmitted from different devices simultaneously.

  • Even if one of the components fails there is an alternative route to get to other computers

  • Expansion and modification in topology can be done without disrupting other nodes.

    Disadvantages:

  • Expensive to provide so much redundancy in network connections.