Basic CS-Networks [3i Infotech Placement]: Sample Questions 40 - 41 of 90

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Question 40

Networks
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Describe in Detail

Essay▾

What is redirector?

Explanation

Understanding of Redirectors
  • Redirector is software that intercepts file or print I/O requests translating them to network requests.
  • Comes under presentation layer- different presentation of same requests.
  • Allows to locate, open, read, write, and delete files and submit print jobs.
  • Sends requests for file operations from local client applications to a remote server where the requests are processed.
  • It is the software, which virtualizes the remote files and resources to be same as local files and resources allowing them to be used and manipulated in the same way- for example read and written.
  • Makes access to remote resources as transparent as possible for the local client application.
  • The redirector, in case of network problems with try the request several times finally returning an error to the client application.

Basic software components of a network redirector.

  • A kernel-mode file system device driver.
  • A user-mode dynamic link library

Question 41

Networks
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Describe in Detail

Essay▾

What are the possible ways of data exchange?

Explanation

Define Parts of Transmission Modes

Simplex:

  • Travels in only one direction.
  • Example- person talking into microphone and then hearing voice from the speaker.
  • Keyboard connected to CPU provides simplex communication- CPU never needs to send characters to the keyboard but the keyboard always send characters to the CPU.

Half-duplex:

  • Capable of sending signal in both directions- only one direction at a time.
  • Example- police car radio phones allowing one person to talk at a time but both sides can talk to one-another.

Full-duplex:

  • Data can be transmitted in both directions simultaneously.
  • A local area network has full-duplex transmission, one workstation can be sending data on the line while another workstation is receiving data.
  • Full-duplex transmission necessarily implies a bidirectional line.
  • Example- telephone IP service.
  • Also called bidirectional transmission.

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