Data Communications and the World Wide Web
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Data Communications and the World Wide Web

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Questions and Answers

What is the primary purpose of a data communications network?

  • To enhance computer processing speed
  • To store data on local servers
  • To transmit and/or receive information between locations (correct)
  • To connect devices through physical cables

    • The term 'data' refers to any information stored in digital form.

    True

    What is the role of a firewall in a data communications network?

    To convert the Intranet address to the Public Internet address.

    A ___ network consists of interconnected devices sharing a single communication medium.

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

    Match the following terms to their definitions:

    <p>Data = Information stored in digital form Network = Set of devices interconnected by media links Intranet = Private data communications network within a company Protocol = Sets of rules for data communication</p> Signup and view all the answers

    Which of the following classifications is considered 'current' in network technology?

    <p>The most modern networks and protocol</p> Signup and view all the answers

    Legacy networks are preferred by most companies today.

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

    What is meant by 'information' in the context of data communications?

    <p>Knowledge or intelligence.</p> Signup and view all the answers

    What year was the telephone invented by Alexander Graham Bell?

    <p>1875</p> Signup and view all the answers

    The World Wide Web (WWW) is primarily a point-to-point communication channel.

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

    What does OSI stand for?

    <p>Open Systems Interconnection</p> Signup and view all the answers

    The development of ENIAC occurred in ______.

    <p>1946</p> Signup and view all the answers

    Which of the following describes multicasting?

    <p>Messages are for a specific group of subscribers.</p> Signup and view all the answers

    Match the following terms with their descriptions:

    <p>Connection Oriented Protocol = Established between endpoints prior to data transmission Batch Processing = Technique used by early computers to process one job at a time Data Communications Protocols = Sets of rules governing the orderly exchange of data Layered Network Architecture = Consists of two or more independent levels with specific responsibilities</p> Signup and view all the answers

    The UNIVAC was the first mass-produced electronic computer.

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

    In a ______ communication channel, messages are intended for all subscribers on the network.

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

    Which of the following is NOT a popular Network Operating System (NOS)?

    <p>Windows 10</p> Signup and view all the answers

    File mapping schemes are only implemented for Windows-based systems.

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

    What is the primary function of a Network Interface Card (NIC)?

    <p>To prepare, send, receive, and control data flow between the computer and the network.</p> Signup and view all the answers

    Shared printers and peripherals are hardware resources provided by _____ to the users of the network.

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

    Match the following file mapping schemes with their examples:

    <p>MS-DOS = Example of a file mapping scheme Unix = Example of a file mapping scheme Windows 95 = Example of a file mapping scheme PC-DOS = Example of a file mapping scheme</p> Signup and view all the answers

    Which transmission medium is commonly used to interconnect computers in a network?

    <p>Optical fiber cable</p> Signup and view all the answers

    Security systems in a network are designed to protect files and resources.

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

    What does the term 'shared data' refer to in a network environment?

    <p>Data files, printer access programs, and e-mail provided by file servers to clients.</p> Signup and view all the answers

    What is the primary reason for interconnecting computers in a Local Area Network (LAN)?

    <p>Resource sharing</p> Signup and view all the answers

    In a point-to-point topology, the network contains more than two hosts.

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

    What is a network server primarily used for?

    <p>Storage and backup</p> Signup and view all the answers

    A ____ topology connects all devices to a central hub.

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

    Match the following network topologies with their descriptions:

    <p>Point to Point = Contains exactly two hosts Bus Topology = Single communication line shared by all hosts Ring Topology = Each device is connected to two other devices forming a circle Mesh Topology = Hosts are interconnected with multiple paths</p> Signup and view all the answers

    Which of the following is NOT a type of LAN technology?

    <p>Web Ethernet</p> Signup and view all the answers

    In a full mesh network, all hosts have a point-to-point connection to every other host.

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

    List one advantage of using a hybrid topology.

    <p>Flexibility in design</p> Signup and view all the answers

    What is the function of a Network Interface Card (NIC)?

    <p>To construct, transmit, receive, and process data to and from a PC and the network</p> Signup and view all the answers

    A computer network is the same everywhere, just like snowflakes.

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

    What must be installed in a computer for it to communicate over a network?

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

    A file server allows clients to access and manipulate _____ resources stored on other computers.

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

    How many bits can be transmitted at a time in a serial by bit transmission line?

    <p>1 bit</p> Signup and view all the answers

    Each Network Interface Card (NIC) has a unique six-byte media access control (MAC) address.

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

    A NIC must be compatible with the network, such as _____ or token ring.

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

    Match the term with its definition:

    <p>NIC = Constructs, transmits, and receives data File Server = Holds shared files and programs MAC address = Unique six-byte address for network devices Local Operating System = Allows access to files on a personal computer</p> Signup and view all the answers

    Study Notes

    Data Communications

    • The transmission, reception, and processing of digital information
    • Data refers to information stored in a digital form
    • Information encompasses knowledge or intelligence
    • A network is a set of devices, called nodes or stations, interconnected by media links.
    • Data communications networks are systems of interrelated computers and equipment.
    • Intranets are private networks.
    • Firewalls convert intranet addresses to public internet addresses.

    World Wide Web (WWW)

    • A server-based application allowing subscribers to access its services.

    History

    • 1844: First telegram transmission between Baltimore and Washington D.C.
    • 1874: Baudot invented a telegraph multiplexer.
    • 1875: Alexander Graham Bell invented the telephone.
    • February 14, 1946: Eckert and Mauchley developed ENIAC, an early computing device.
    • 1950: The first computers could only perform one task using batch processing.
    • 1951: The UNIVAC was the first mass-produced electronic computer.
    • 1980: The development of personal computers.

    Network Architecture

    • Outlines the products and services necessary for the operation of all components in a data communications network.

    Network and Network Protocols

    • Outline the current, legacy, and legendary network protocols.
    • Modern networks are sophisticated.
    • Legacy networks are not actively used.
    • Legendary networks are antiquated protocols that have been replaced.

    Computer Network Classification

    • Networks are categorized based on their communication channel setup and message delivery methods.

    Broadcast Network

    • All devices on the network share a single channel.
    • Messages are intended for all subscribers.
    • Data is transmitted in short segments called frames, blocks, or packets.

    Point-to-Point

    • Only two devices are connected, without the need for addresses.

    Data Communication Protocols

    • A set of rules that governs the orderly exchange of data.

    Network Architecture

    • A set of layers and protocols that defines the operation of a network.

    Protocol Stack

    • Lists the protocols used by a system.

    Layered Network Architecture

    • Consists of multiple independent levels, each with specific responsibilities and functions.

    Connection-Oriented Protocol

    • Requires establishing a connection between endpoints before data transmission can begin.

    OSI Layer

    • The Open Systems Interconnection model defines a layered network architecture.

    Local Area Network (LAN)

    • A network spanning a single building, typically under a single administrative system.

    Network LAN Technologies

    • Ethernet (IEEE 802.3): High-speed network technology that uses carrier sense multiple access / collision detection (CSMA/CD) technology for collision detection.
    • Fast-Ethernet (IEEE 803.2): A faster version of Ethernet.
    • Serial-by-Bit: Transmits data one bit at a time, used for long-distance communications.

    Communication Infrastructure

    • The facilities used to connect computers within a network, like twisted-pair wire, coaxial cable, or optical fiber cable.

    Types of Computer Networks

    • The scale of the Network determines the network type.
    • Personal Area Network (PAN): Connectivity limited to a small area, often used for devices like smartphones and computers.
    • Local Area Network (LAN) - Network spanning a single building under a single administrative system.

    Computer Network Topologies

    • Topologies describe the physical arrangement of devices in a network.

    Point-to-Point

    • Network containing exactly two hosts.

    Bus Topology

    • All stations and devices on the network share a single communication channel.

    Star Topology

    • All devices connect to a central device (like a hub) via point-to-point connections.

    Ring Topology

    • Devices on the network are connected in a circular formation.

    Mesh Topology

    • Each host connects to one or multiple other hosts.
    • Full Mesh: All hosts have a point-to-point connection to all other hosts in the network.
    • Partially Mesh: Not all hosts are directly connected to every other host.

    Tree Topology

    • A hierarchical network structure with a root node at the top, branching out to other devices.

    Daisy Chain Topology

    • Devices are linearly connected in a chain.

    Hybrid Topology

    • A combination of multiple different network topologies in a single network.

    Network Components, Functions, and Features

    • Server: Computers that share files, programs, and the network operating system.
    • Clients: Devices that access and use shared network resources.
    • Shared Data: Data provided by servers to clients such as files, printer programs, and email.
    • Shared Printers and Peripherals: Hardware resources provided by servers to clients.
    • Network Interface Card (NIC): A special expansion card responsible for preparing data and controlling data flow between the computer and the network.
    • Local Operating System: Operating system that allows PCs to access shared files.
    • Network Operating System (NOS): Program that enables computers to communicate over a network.

    Network Interface Card Characteristics

    • The NIC prepares, transmits, receives, and processes data between the PC and the network.
    • Each computer requires a NIC.
    • The NIC is installed as a daughterboard within the computer.
    • Each card has a unique MAC address (also known as the physical, hardware, node, Ethernet, or LAN address).
    • The MAC address is necessary for the NIC to function properly and be compatible with the network.
    • Unix
    • Novell Net Ware
    • AppleShare
    • Macintosh System 7
    • IBM LAN Server
    • Compaq OpenVMS

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    Explore the fundamentals of data communications including the evolution of networks and the significance of the World Wide Web. This quiz covers key historical milestones and technologies that have shaped digital communication. Test your knowledge of intranets, firewalls, and crucial inventions in the field.

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