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Lecture in Introduction to Data Communications and Networking

(Last Updated On: December 8, 2017)
Introduction to Datacommunication and Networking

Lesson Objectives – the students should be able to:

  • Define Data Communications
  • Enumerates and understand the functions of each components of Data Communications
  • Understand Data Representations and Data Flow
  • Define Networks
  • Understand Distributed Processing, Network Criteria, Physical Structures, Network Models
  • Enumerates the Categories of Network
  • Learn Interconnection of Network: Internetwork
  • Define the Internet
  • Know the brief history of Internet
  • Define Protocols and Standard

Lecture on Introduction to Datacommunication and Networking PPT

List of Data Communications Course Outline and Lectures

Definition of Terms

  • Data communication is the transfer of data from one device to another via some form of transmission medium.
  • A data communications system must transmit data to the correct destination in an accurate and timely manner.
  • A network is a set of communication devices connected by media links.
  • Topology refers to the physical or logical arrangement of a network. Devices may be arranged in a mesh, star, bus, or ring topology.
  • An internet is a network of networks.
  • The Internet is a collection of many separate networks.
  • TCP/IP is the protocol suite for the Internet.
  • A protocol is a set of rules that governs data communication; the key elements of a protocol are syntax, semantics, and timing.
  • Standards are necessary to ensure that products from different manufacturers can work together as expected.
  • Forums are special-interest groups that quickly evaluate and standardize new technologies.
  • A Request for Comment (RFC) is an idea or concept that is a precursor to an Internet standard.

Five Components of Data Communications

  • message
  • sender
  • receiver
  • medium
  • protocol

Different forms of information

  • Text
  • numbers
  • images
  • audio
  • video

Data flow between two devices

  • Simplex – Only one of the two devices on a link can transmit; the other can only receive.
  • Half-duplex – Each station can both transmit and receive, but not at the same time.
  • Full-duplex – Both stations can transmit and receive simultaneously.

Three criteria for an effective and efficient network

  • Performance – Measured in many ways, including transit time and response time. It is evaluated by two networking metrics: throughput and delay.
  • Reliability – Measured by the frequency of failure, the time it takes a link to recover from a failure, and the network’s robustness in a catastrophe.
  • Security – Include protecting data from unauthorized access, protecting data from damage and development, and implementing policies and procedures for recovery from breaches and data losses.

Types of Connection (Line configurations)

  • Point-to-point connection – two and only two devices are connected by a dedicated link.
  • Multipoint connection – three or more devices share a link.

Four Basic Topologies

  • Mesh – Every device has a dedicated point-to-point link to every other device.
  • Star – Each device has a dedicated point-to-point link only to a central controller, usually called a hub.
  • Ring – Each device has a dedicated point-to-point connection with only the two devices on either side of it.
  • Bus – One long cable acts as a backbone to link all the devices in a network.

Network Categories

  • Local area network (LAN) – data communication system within a building, plant, or campus, or between nearby buildings.
  • Metropolitan-area network (MAN) – data communication system covering an area the size of a town or city.
  • Wide area network (WAN) – data communication system spanning states, countries, or the whole world.

Internet service providers (ISPs)

  • Local
  • Regional
  • National
  • International

Key Elements of a Protocol

  • Syntax – structure or format of the data, meaning the order in which they are presented.
  • Semantics – the meaning of each section of bits.
  • Timing – refers to two characteristics: when data should be sent and how fast they can be sent.

Some of the organizations involved in standards creation

  • ISO
  • ITU-T
  • ANSI
  • IEEE
  • EIA
Note: Lets see how well you the understand the first chapter and try answering the Multiple Choice Questions here.

List of Data Communications Lectures

credit: Behrouz A. Forouzan©2013 www.PinoyBIX.org

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