Chapter Three Sample Questions

The physical layer is a layer where two communicating nodes are directly connected.

Answer... Hide Answer: True Difficulty: Easy

Reference: The Three Faces of Networking

A physical circuit refers to the transmission characteristics of the connection.

Answer... Hide Answer: False Difficulty: Easy

Reference: Introduction

Computers produce digital data whose values are binary: 0 or 1.

Answer... Hide Answer: True Difficulty: Easy

Reference: Introduction

With modem communications, the receiving modem converts the incoming digital signal from the telephone line into an analog signal that can be understood by the computer.

Answer... Hide Answer: False Difficulty: Moderate

Reference: Introduction

Digital transmission produces more errors than analog transmission.

Answer... Hide Answer: False Difficulty: Easy

Reference: Introduction

Newer telephone circuits, built during the last decade, offer higher quality because they were built using analog transmission.

Answer... Hide Answer: False Difficulty: Easy

Reference: Introduction

In a multipoint circuit configuration, each computer has a dedicated circuit between itself and each of the other computers in the network

Answer... Hide Answer: False Difficulty: Easy

Reference: Circuit Configuration

In a multipoint circuit configuration, each computer can use the circuit at the same time.

Answer... Hide Answer: False Difficulty: Easy

Reference: Circuit Configuration

In simplex transmission, the data flows in both directions at the same time

Answer... Hide Answer: False Difficulty: Easy

Reference: Data Flow

A walkie-talkie is an example of half-duplex transmission.

Answer... Hide Answer: True Difficulty: Moderate

Reference: Data Flow

The amount of time it takes to switch between sending and receiving in half-duplex transmission is called the propagation delay.

Answer... Hide Answer: False Difficulty: Easy

Reference: Data Flow

In full-duplex transmission, two stations can send and receive simultaneously.

Answer... Hide Answer: True Difficulty: Easy

Reference: Data Flow

The medium is the physical matter or substance that carries the voice or data transmission.

Answer... Hide Answer: True Difficulty: Easy

Reference: Communication Media

Guided media refers to the type of media in which the message is broadcast through the air.

Answer... Hide Answer: False Difficulty: Easy

Reference: Communication Media

Coaxial cable costs less and offers less shielding to electrical interference than twisted pair cable.

Answer... Hide Answer: False Difficulty: Moderate

Reference: Coaxial Cable

Fiber optic cable carries signals in traditional electrical form

Answer... Hide Answer: False Difficulty: Easy

Reference: Fiber-Optic Cable

Multimode fiber is capable of longer transmission distances than single mode fiber.

Answer... Hide Answer: False Difficulty: Easy

Reference: Fiber-Optic Cable

Radio data transmission requires that each device has a radio receiver/transmitter and uses a specific frequency.

Answer... Hide Answer: True Difficulty: Moderate

Reference: Radio

Frequency division multiplexing is used on twisted-pair cabling.

Answer... Hide Answer: False Difficulty: Moderate

Reference: Wavelength division multiplexing

Microwave transmissions require a line of sight between any two points.

Answer... Hide Answer: True Difficulty: Easy

Reference: Microwave

Propagation delay is negligible with satellite transmission.

Answer... Hide Answer: False Difficulty: Moderate

Reference: Satellite

One form of interference with satellite transmission is called raindrop attenuation in which the transmissions are absorbed by heavy rain.

Answer... Hide Answer: True Difficulty: Moderate

Reference: Satellite

Fiber optic cable can only be used on LANs.

Answer... Hide Answer: False Difficulty: Easy

Reference: Media Selection

Radio, microwave and satellite are all examples of guided media.

Answer... Hide Answer: False Difficulty: Moderate

Reference: Wireless Media

Of all the media available, fiber optic provides the highest transmission speeds.

Answer... Hide Answer: True Difficulty: Moderate

Reference: Media Selection

Coding schemes are groups of bits that translate into the “alphabet” of any given system.

Answer... Hide Answer: True Difficulty: Easy

Reference: Coding

ASCII is the least popular code for data communications.

Answer... Hide Answer: False Difficulty: Easy

Reference: Coding

The predominant method of transferring information internally in a computer is via parallel mode.

Answer... Hide Answer: True Difficulty: Easy

Reference: Parallel Mode

Serial mode transmission is much faster than parallel mode transmission.

Answer... Hide Answer: False Difficulty: Easy

Reference: Serial Mode

Nonreturn to zero is a type of unipolar signaling

Answer... Hide Answer: False Difficulty: Moderate

Reference: Digital Transmission

With nonreturn to zero signaling, the voltage alternates between zero and a positive or negative voltage.

Answer... Hide Answer: False Difficulty: Easy

Reference: Digital Transmission

Ethernet, a common LAN technology, uses Manchester encoding.

Answer... Hide Answer: True Difficulty: Easy

Reference: How Ethernet Transmits Data

Manchester encoding is a special type of bipolar signaling in which the signal is changed from high to low or from low to high in the middle of the signal.

Answer... Hide Answer: True Difficulty: Moderate

Reference: How Ethernet Transmits Data

Digital transmission occurs when the signal sent over the transmission media constantly varies among an infinite number of states.

Answer... Hide Answer: False Difficulty: Easy

Reference: Analog Transmission of Digital Data

Frequency is the number of cycles per second and is expressed in Hertz.

Answer... Hide Answer: True Difficulty: Easy

Reference: Analog Transmission of Digital Data

Amplitude, frequency and phase are all characteristics of a sound wave.

Answer... Hide Answer: True Difficulty: Easy

Reference: Basic Modulation

Frequency modulation refers to the changing of the height of the sound wave.

Answer... Hide Answer: False Difficulty: Moderate

Reference: Basic Modulation

Baud rate is the number of bits transmitted per second.

Answer... Hide Answer: False Difficulty: Easy

Reference: Bit Rate versus Baud Rate versus Symbol Rate

Bandwidth is the difference between the highest and lowest frequencies in a band.

Answer... Hide Answer: True Difficulty: Easy

Reference: Capacity of a Circuit

Data compression can increase the throughput of a communication link.

Answer... Hide Answer: True Difficulty: Easy

Reference: How Modems Transmit Data

A codec converts an incoming digital signal to an analog signal for transmission over an analog network.

Answer... Hide Answer: False Difficulty: Moderate

Reference: Digital Transmission of Analog Data

One way to reduce quantizing errors is to increase the sampling rate of the analog signal.

Answer... Hide Answer: True Difficulty: Moderate

Reference: Translating from Analog to Digital

The “local loop” refers to the wires that run from the customer premises to the telephone switch of the telephone company.

Answer... Hide Answer: True Difficulty: Moderate

Reference: How Telephones Transmit Voice Data

Multiplexing increases the cost of provisioning network circuits.

Answer... Hide Answer: False Difficulty: Moderate

Reference: Multiplexing

Frequency division multiplexing divides the circuit into a set of different time slots.

Answer... Hide Answer: False Difficulty: Moderate

Reference: Frequency Division Multiplexing

Time division multiplexing is more efficient that frequency division multiplexing because the guardbands used in the frequency division multiplexing or not needed.

Answer... Hide Answer: True Difficulty: Moderate

Reference: Time Division Multiplexing

Statistical time division multiplexing does not require the capacity of the circuit to be equal to the sum of the combined circuits.

Answer... Hide Answer: True Difficulty: Moderate

Reference: Time Division Multiplexing

Wavelength division multiplexing can only used with copper cables.

Answer... Hide Answer: False Difficulty: Easy

Reference: Wavelength Division Multiplexing

Digital transmission permits higher maximum transmission rates when compared to analog.

Answer... Hide Answer: True Difficulty: Easy

Reference: Introduction

  1. Multitasking means to break one high-speed physical communication circuit into several lower-speed logical circuits so that different devices can simultaneously use it.

Answer... Hide Answer: False Difficulty: Easy

Reference: Data Flow

Topic revision: r1 - 2012-12-06 - JimSkon
 
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