Basic CS-Networks [3i Infotech Placement]: Sample Questions 68 - 69 of 90

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Question 68

Networks
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Write in Short

Short Answer▾

Describe at a high level how two devices communicate over network.

Explanation

  • Data communications is transmission of digital data between two computers.
  • Computer or data network is telecommunications network allowing computers to exchange data.
  • Physical connection between networked computing devices established through cable or wireless media.
  • The best example of a computer network is the Internet.
  • Communication hardware is capable of transmitting an analogue or digital signal- for example, computer modem, network interface card (NIC) , Wi-Fi devices, and access points.

Question 69

Networks
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Describe in Detail

Essay▾

Can you name a couple of Layer 2 (Data link) protocols?

Explanation

Ethernet:

  • Provides services corresponding to Layer 1 and Layer 2 of the OSI reference model.
  • Different standards used in Ethernet define the different layer-1 and layer-2 protocols.
  • Data link layer provides mechanisms for converting packets to frames while the physical layer converts frames to bits transmitted over the physical media.

FDDI:

  • Fibre Distributed Data Interface.
  • Set of ANSI and OSI standards for data transmission on fibre optic lines in local area network extending up to 200km.
  • Use token ring protocol.
  • High-speed backbone technology supporting greater distances than copper.

ATM:

  • Asynchronous Transfer Mode.
  • High-speed networking standard supporting voice, video, and data communications.
  • Utilized by internet service providers on their private long-distance network.
  • Easily implemented by hardware providing faster processing and switch speeds.
  • Provides data-link-layer services running on the OSI՚s Layer 1 physical links.
  • Virtual circuit or connection is established before the two end-points can actually exchange data.

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