3i Infotech Placement: Sample Questions 1146 - 1147 of 1245

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Question 1146

Describe in Detail Essay▾

What is thrashing?

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Explanation

Graph this Indicate Thrashing
  • Thrashing is little progress in a computer system because memory or other resources are either exhausted or limited to perform needed operations.
  • Caused in virtual memory schemes when the processor spends most of its time swapping pages- due to page faults.
  • It is caused when pages in memory refer other pages.
  • The large “working set” of active processes cannot be all accommodated in the real memory.
  • Virtual memory systems allows placing some pages on virtual memory- only bringing required page on demand into the RAM.
  • A thrashing system is either a very slow system might come to a halt.
  • Generally occurs when enough frames are not allocated to a process than are needed.

Two Ways to Prevent Thrashing

  • Instruct mid-term scheduler to swap out some of the process to recover from thrashing
  • Instructing the dispatcher not to load more processes after a threshold

Question 1147

Describe in Detail Essay▾

What is NETBIOS and NET BEUI?

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Explanation

  • NETBIOS:
    • Programming interface allowing I/O requests to be sent to and received from a remote computer.
    • Hides the networking hardware from applications.
    • Supports small to medium networks providing transport and network layer support.
    • Fast and small and works well for the DOS operating system.
  • System wide methods of resolving NETBIOS names to IP address are:
    • b-node - Broadcast node
    • p-node - Point-to-point node queries an NBNS name server to resolve addresses.
    • m-node - First uses broadcasts, then falls back to querying an NBNS name server.
    • h-node - The system first attempts to query an NBNS name server, then falls back to broadcasts if the name server fails.
  • NETBEUI:
    • NETBEUI is NETBIOS extended user interface.
    • A transport protocol designed by Microsoft and IBM for small subnets responsible for data transport.
    • Handles all the frame formatting not handled by NETBIOS.