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Networking Chapter 3 Quiz
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Networking Chapter 3 Quiz

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Questions and Answers

What is the main function of the physical layer in a network?

  • Establishing logical circuits for data transmission
  • Transmitting voice data using PAM modulation
  • Selecting communication media for data transmission
  • Connecting network hardware and circuits (correct)
  • What does FDM stand for in the context of circuits?

  • Forward Data Multiplexing
  • Frequency Division Multiplexing (correct)
  • Frequency Division Modem
  • Frame Distribution Mode
  • In the context of network circuits, what does a T-1 connection refer to?

  • A type of wireless communication media
  • A logical circuit with high speed data flow
  • A physical circuit with a transmission rate of 1.544 Mbps (correct)
  • A connection for transmitting voice data
  • What is the purpose of modems in analog transmission of digital data?

    <p>To convert digital data to analog signals for transmission</p> Signup and view all the answers

    What is the approximate size of a multimode optical fiber core?

    <p>50 microns</p> Signup and view all the answers

    What type of transmission does a single mode optical fiber use?

    <p>Transmits a single direct beam through the cable</p> Signup and view all the answers

    What type of wireless transmission is subject to interference from heavy rain, smog, and fog?

    <p>Infrared waves</p> Signup and view all the answers

    What type of radio communication requires line-of-sight and is often used for long distance, terrestrial transmissions?

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

    Which of the following factors is used in media selection?

    <p>Error rates in the wireless media</p> Signup and view all the answers

    Which code is used to represent letters, numbers, and symbols in a message on PC computers?

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

    Which transmission mode sends bit by bit over a single wire?

    <p>Serial transmission</p> Signup and view all the answers

    What type of signaling defines how the voltage levels correspond to the bit values of 0 or 1?

    <p>Unipolar signaling</p> Signup and view all the answers

    Which digital transmission type defines a bit value by a mid-bit transition?

    <p>Manchester encoding</p> Signup and view all the answers

    What type of transmission is used in local loop phone lines to connect PCs to the Internet?

    <p>Analog transmission</p> Signup and view all the answers

    What technology is used to enable voice communications between two telephones over POTS?

    <p>Analog communications</p> Signup and view all the answers

    Which characteristic of sound waves refers to the number of waves that pass in a second?

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

    What is the main advantage of digital transmission over analog transmission?

    <p>Allows higher maximum transmission rates</p> Signup and view all the answers

    In a point-to-point configuration, why does each computer have its own circuit to reach the other computer in the network?

    <p>Because each computer generates enough data to fill the capacity of the circuit</p> Signup and view all the answers

    Which type of data flow moves in both directions at the same time?

    <p>Data flows in both directions at the same time</p> Signup and view all the answers

    In which data flow method does data flow in one direction only?

    <p>Simplex Method</p> Signup and view all the answers

    Which type of multiplexing requires guardbands to prevent interference between channels?

    <p>Frequency division multiplexing (FDM)</p> Signup and view all the answers

    How does time division multiplexing (TDM) divide up the circuit?

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

    What is the main advantage of statistical time division multiplexing (STDM) over traditional TDM?

    <p>It makes use of the idle time slots</p> Signup and view all the answers

    What does Inverse Multiplexing (IMUX) do?

    <p>Shares the load by sending data over two or more lines</p> Signup and view all the answers

    How does Frequency Division Multiplexing (FDM) create smaller channels from a larger frequency band?

    <p>Dividing the circuit horizontally</p> Signup and view all the answers

    Which type of configuration is used when many computers are connected on the same circuit?

    <p>Multipoint Configuration</p> Signup and view all the answers

    What is a key advantage of digital transmission in terms of error detection and correction?

    <p>Easier to detect and correct errors due to binary nature (1s and 0s)</p> Signup and view all the answers

    Study Notes

    Physical Layer Functions

    • Facilitates the transmission and reception of raw bitstreams over a physical medium.
    • Responsible for signaling, data rate, and physical network topology.

    FDM

    • Stands for Frequency Division Multiplexing.
    • Technique used in circuits to divide multiple signals across a frequency band.

    T-1 Connection

    • Refers to a dedicated digital transmission line that carries data at a rate of 1.544 Mbps.

    Modems

    • Convert digital data into analog signals for transmission over phone lines.
    • Enable communication by modulating and demodulating data.

    Multimode Optical Fiber Core Size

    • Typically has a core diameter of around 50 to 62.5 micrometers.

    Single Mode Optical Fiber

    • Uses a single light mode for transmission, allowing for longer distance communication and higher bandwidth.

    Wireless Transmission Interference

    • Transmission subject to interference from heavy rain, smog, and fog typically involves microwave signals.

    Radio Communication

    • Requires line-of-sight and is often utilized for long-distance terrestrial transmissions, such as microwave communication.

    Media Selection Factors

    • Considerations include cost, bandwidth, distance, and environment.

    PC Code Representation

    • ASCII (American Standard Code for Information Interchange) is used to represent letters, numbers, and symbols.

    Transmission Mode

    • Serial transmission sends data bit by bit over a single wire.

    Signaling Method

    • Defines how voltage levels correspond to binary values (0 or 1) through signaling techniques.

    Digital Transmission Type

    • Defines bit value using mid-bit transitions, often utilized in differential signaling.

    Local Loop Phone Lines

    • Used for digital subscriber line (DSL) connections to connect PCs to the Internet.

    Voice Communication Technology

    • POTS (Plain Old Telephone Service) enables voice communications between telephones.

    Sound Waves Characteristic

    • Frequency refers to the number of waves that pass in a second, measured in Hertz (Hz).

    Digital vs Analog Transmission

    • Main advantage of digital transmission includes better noise resistance and improved error correction capabilities.

    Point-to-Point Configuration

    • Each computer has its own circuit to ensure dedicated communication without interference.

    Data Flow Types

    • Full-duplex data flow allows simultaneous two-way communication.
    • Simplex data flow permits communication in one direction only.

    Multiplexing Types

    • Frequency Division Multiplexing requires guardbands to prevent channel interference.

    Time Division Multiplexing (TDM)

    • Divides a circuit into time slots allocated to multiple signals for sequential transmission.

    Statistical Time Division Multiplexing (STDM)

    • Advantageous as it adapts to varying data rates, more efficiently using bandwidth compared to traditional TDM.

    Inverse Multiplexing (IMUX)

    • Distributes data over multiple channels to increase bandwidth for transmission.

    Frequency Division Multiplexing (FDM) Process

    • Divides a larger frequency band into smaller channels, allowing simultaneous transmission of different signals.

    Configuration for Multiple Computers

    • Bus or a star configuration is often used when many computers connect on the same circuit.

    Digital Transmission Error Handling

    • Key advantage includes robust error detection and correction mechanisms, enhancing data integrity during transmission.

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    Description

    Test your knowledge on circuits configuration, data flow, multiplexing, communication media, and digital transmission as outlined in Chapter 3 of the 9th Edition of 'Business Data Communications and Networking' by Jerry Fitzgerald and Alan Dennis.

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