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?

To convert digital data to analog signals for transmission Signup and view all the answers

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

50 microns Signup and view all the answers

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

Transmits a single direct beam through the cable Signup and view all the answers

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

Infrared waves Signup and view all the answers

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

Microwaves Signup and view all the answers

Which of the following factors is used in media selection?

Error rates in the wireless media Signup and view all the answers

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

ASCII Signup and view all the answers

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

Serial transmission Signup and view all the answers

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

Unipolar signaling Signup and view all the answers

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

Manchester encoding Signup and view all the answers

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

Analog transmission Signup and view all the answers

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

Analog communications Signup and view all the answers

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

Frequency Signup and view all the answers

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

Allows higher maximum transmission rates 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?

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

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

Data flows in both directions at the same time Signup and view all the answers

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

Simplex Method Signup and view all the answers

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

Frequency division multiplexing (FDM) Signup and view all the answers

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

Vertically Signup and view all the answers

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

It makes use of the idle time slots Signup and view all the answers

What does Inverse Multiplexing (IMUX) do?

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

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

Dividing the circuit horizontally Signup and view all the answers

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

Multipoint Configuration Signup and view all the answers

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

Easier to detect and correct errors due to binary nature (1s and 0s) 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.