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Computer Network Detailed Easy Explanation
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  • Course
  • Computer Networks
  • Institution
  • Harvard University, Cambridge University

This PDF offers a comprehensive yet straightforward guide to key topics in computer networking. It breaks down complex networking concepts into easy-to-understand explanations, making it an ideal resource for students, beginners, or professionals looking to refresh their knowledge. The document...

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Document information

  • October 20, 2024
  • 64
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

Subjects

  • computer networks
  • sdlc
  • data link layer
  • slip
  • ftp protocols
  • udp protocols
  • http
  • dns
  • tcpip model

Written for

  • Harvard University, Cambridge University
  • Computer Networks
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,Datalink layer protocols
INTRODUCTION:
➢Data link layer is second layer of OSI layered model. this layer is one
the most complicated layers and has complex functionalities
liabilities. data link layer hides the details of underlying hardware
represents itself to upper layer as the medium to communicate.
➢ Data link layer is responsible for converting data stream to signals bit
bit and to send that over the underlying hardware. At the receiving e
Data link layer picks up data from hardware which are in the form
electrical signals, assembles them in a recognizable frame format,
hands over to upper layer.

,Protocols in datalink layer

, SDLC [synchronous data link control work]

➢In SDLC, data is sent as a synchronous bit stream. this stream is divided int
frames. each frame contains addressing and control information, as well as
data payload.
➢In the primary station/secondary station model of communication, one stati
is designated as primary, while the remaining stations are secondary.
➢Establish control and tear down SDLC connections;
➢Manage connections
➢Poll secondary stations in a specific order to determine whether they want t
transmit data.

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