TCS Papers: Sample Questions 220 - 221 of 502

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Question number: 220

» Basic CS » Networks

Essay Question▾

Describe in Detail

What is point- to-point protocol?


  • Point-to-point communications protocol connects computers to remote networking services including Internet service providers- most common type of WAN connection.

  • PPP connections connect LANs to service provider WANs, and connect LAN segments within an organization network.

  • A LAN-to-WAN point-to-point connection is also referred to as a serial connection or leased-line connection because the lines are leased from a carrier (usually a telephone company) and are dedicated for use by the company leasing the lines.

  • PPP can be used over twisted pair, fiber-optic lines, or satellite transmission.

  • PPP provides transport over ATM, Frame Relay, ISDN, and optical links.

 Point-to-point protocol

Point-to-Point Protocol

Given the image is define the point-to-point protocol

Question number: 221

» Basic CS » Networks

Essay Question▾

Describe in Detail

What are the responsibilities of Presentation Layer?


The Presentation layer is concerned with the syntax and semantics of the information exchanged between two systems.

  • Translation

    • Before being transmitted, information in the form of characters and numbers should be changed to bit streams.

    • Presentation layer provides interoperability between encoding methods as different computers use different encoding methods.

    • Translates data between formats of network and the format understood by the computer.

  • Encryption

    Carries out encryption at the transmitter and decryption at the receiver.

  • Compression

    • Does data compression to reduce the bandwidth.

    • Important in transmitting multimedia such as audio, video, text etc.