Data Communications Overview
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Data Communications Overview

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Questions and Answers

What device is typically used to interconnect Local Area Networks (LANs)?

  • Modem
  • Bridge
  • Router
  • Switch (correct)
  • Which generation of cellular networks is currently available in the market?

  • Second generation
  • Third generation
  • Fifth generation (correct)
  • Fourth generation
  • In what settings are sensor networks primarily found?

  • Public wireless hotspots
  • Home networks
  • Industrial and real-world settings (correct)
  • Educational institutions
  • What do mainframe computers typically support in a business environment?

    <p>Business day-to-day operations</p> Signup and view all the answers

    Which type of network connects resources that reside ‘in the cloud’?

    <p>Cloud Networks</p> Signup and view all the answers

    What is data communications primarily concerned with?

    <p>Digital and analog data transfer</p> Signup and view all the answers

    Which of the following is NOT a type of network topology?

    <p>Blend Topology</p> Signup and view all the answers

    What component is essential for a computer to connect to a network?

    <p>Network Interface Card (NIC)</p> Signup and view all the answers

    What type of network typically spans a city-sized area?

    <p>Metropolitan Area Network (MAN)</p> Signup and view all the answers

    Which data code allows for a large number of languages and character sets?

    <p>Unicode</p> Signup and view all the answers

    Which device acts as a bridge between a LAN and the Internet?

    <p>Router</p> Signup and view all the answers

    Which of the following best describes a Personal Area Network?

    <p>Connects devices within a few centimeters to several meters</p> Signup and view all the answers

    Which is NOT a component of a data communication system?

    <p>Firewall</p> Signup and view all the answers

    Which of the following network types is designed for a relatively small geographic area?

    <p>Local Area Network (LAN)</p> Signup and view all the answers

    What is cloud computing primarily used for?

    <p>Remote servers managing and processing data</p> Signup and view all the answers

    Study Notes

    Data Communications

    • Data communications involve the transfer of digital or analog data using digital or analog signals
    • Components of a data communication system include data representation, direction of data flow, and the physical medium

    Five Components of Data Communication System

    • These components are:
      • Sender: The device sending the data.
      • Receiver: The device receiving the data.
      • Transmission Medium: The physical channel (e.g., cable, wireless) through which data travels between sender and receiver.
      • Protocol: A set of rules that govern the communication process (how data is formatted, transmitted, and received).
      • Data: The information being transmitted.

    Types of Information

    • Data can be categorized into:
      • Audio
      • Textual
      • Image
      • Video

    Data Codes

    • Each textual character or symbol is represented by a corresponding binary pattern, forming a data code (character set).
    • ASCII and Unicode are two common data codes.

    ASCII

    • ASCII (American Standard Code for Information Interchange) has a limited number of characters and is used for English and some Western European languages.

    Unicode

    • Unicode uses 8/16 bits per character, supporting a broader range of languages and character sets, including those with complex scripts.
    • Example character representations in Unicode:
      • "T": 0000 0000 0101 0100
      • "r": 0000 0000 0111 0010
      • "a": 0000 0000 0110 0001

    Network Topology

    • Network topology refers to the physical layout of a network. Topologies include:
      • Bus Topology: Devices connect to a shared central cable.
      • Ring Topology: Devices are connected in a closed loop.
      • Star Topology: Devices connect to a central hub or switch.
      • Mesh Topology: All devices connect directly to each other.
      • Tree Topology: A hierarchical structure with a root node connecting to branches.
      • Hybrid Topology: A combination of two or more topologies.

    Network Language

    • Personal Area Network (PAN): A network connecting devices within a few centimeters to several meters (e.g., smartphones, laptops).
    • Local Area Network (LAN): A network spanning a room, floor, or building.
    • Campus Area Network (CAN): A network encompassing a university or business campus, connecting multiple LANs.
    • Metropolitan Area Network (MAN): A network serving an area of 1 to 50km, often covering a city.
    • Wide Area Network (WAN): A large network encompassing multiple states, countries, or even the globe.

    Cloud Computing

    • Cloud computing utilizes a network of remote servers on the internet to store, manage, and process data.
    • Networks connect resources residing "in the cloud".

    The Big Picture of Networks

    • Networks consist of various devices, including:
      • Workstations (computers, tablets, smartphones, etc.)
      • Servers
      • Switches
      • Routers
      • Modems

    The Desktop Computer and the Internet

    • Desktop computers use a network interface card (NIC) to connect to a LAN via a switch and router.
    • This allows them to access the Internet.

    Local Area Network-to-Local Area Network

    • Interconnection between two or more LANs is achieved using a bridge-like device (e.g., a switch).

    Cellular Network

    • Cellular networks are constantly evolving with higher speeds due to new generations like 5G.

    Sensor Network

    • Sensor networks are utilized in industrial and real-world settings, connecting sensors that gather data and control devices.

    Industrial Sensor-based Systems

    • These systems are commonly used for assembly lines, robotic control, and other industrial applications.

    Mainframe Systems

    • Mainframe computers handle large-scale business operations, with user interaction through computer terminals.

    Satellite Networks

    • Satellite networks provide wireless long-distance connections used in applications like digital satellite TV, meteorology, navigation, and maritime communication.

    Cloud Networks

    • Cloud networks connect to virtualized resources in the cloud, using hypervisors to create virtual machines.
    • Different types of cloud networks exist:
      • Public Cloud: Shared resources available to the public.
      • Private Cloud: Resources dedicated solely to a specific organization.
      • Hybrid Cloud: A combination of public and private cloud resources.

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    Related Documents

    CSIT127_L01 - Introduction.pdf

    Description

    Explore the fundamental concepts of data communications, including the five essential components of a communication system. Learn how data is represented, the flow of information, and the different types of data involved. This quiz will help reinforce your understanding of protocols and data encoding.

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