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CS601 - Data Communication - Lecture Handout 45

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Related Content: CS601 - VU Lectures, Handouts, PPT Slides, Assignments, Quizzes, Papers & Books of Data Communication

Internet

  • An internet is a generic term used to mean an interconnection of individual networks
  • To create an internet, we need networking devices called routers and gateways
  • An internet is different from the Internet
  • Internet is the name of a specific worldwide network

Connecting devices (Figure-1)

Connecting devices (Figure-1)

Repeaters

Repeaters (Figure-1)

Repeaters (Figure-1)

  • A repeater allows us to extend only the physical length of a network
  • Repeater is a regenerator, not an amplifier

Repeaters (Figure-2)

Repeaters (Figure-2)

Repeaters (Figure-3)

Repeaters (Figure-3)

Bridges

Bridges

  • Bridges can divide a large network into smaller segments

Bridges 1

When a frame enters a bridge, the bridge:

  • not only regenerates the signal
  • but check the address of the destination and forwards the new copy only to the segment to which the address belongs

frame enters a bridge

Routers

Routers

Routers relay packets among multiple interconnection networks

multiple interconnection networks

TCP/IP

  • Transmission Control Protocol/ Internet Protocol
  • 1969
  • ARPA(Advanced Research Project Agency) net

TCP-IP

TCP/IP and OSI

TCP-IP and OSI

TCP/IP Protocols

  • Network Layer
    • IP (Internetworking Protocol )
    • ARP(Address Resolution Protocol)
    • RARP(Reverse Address Resolution Protocol)
    • ICMP(Internet Control Message Protocol)
    • IGMP(Internet Group Message Protocol)
  • Transport Layer
    • TCP (Transmission Control Protocol)
    • UDP (User Datagram Protocol)

Summary

  • Internet work
  • Connecting Devices
    • Repeaters
    • Bridges
    • Routers
  • TCP/IP Protocol Suite

Reading Sections

Section 21.1, 21.2, 21.3, 24.1, 24.2,
“Data Communications and Networking” 4th Edition by Behrouz A. Forouzan