MIS 140 - Ch 4, 3, and 6 EXAM 2 MIDTERM

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

True

The physical and data link layers of wired Ethernet have been refined over the years as a collection of standards under the IEEE 802.3 workgroup. - True - False

True

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

True

WDM is a version of FDM used in fiber-optic cables. True False

True

In the __________ step of the building-block process to network design, the network designer considers the relative cost of the technologies. -technology design -needs analysis -narrow and deep analysis -cost assessment -distribution layering

cost assessment

ARQ means that: - a receiver that detects an error in a message simply asks the sender to retransmit the message until it is received without error - the common carrier Automatically Returns Queries to the subscriber upon receipt of such queries - a sender is using a data link protocol called Asynchronous Repeating reQuest - a fiber optic cable meets the American Registered Quality, a certification standard for use in high-quality data communication transmission lines - a sender is using a parity scheme called Array Resource Quality

a receiver that detects an error in a message simply asks the sender to retransmit the message until it is received without error

____________ refers to the transmission characteristics of the circuit. -handshaking -virtual circuit -bonding -logical circuit -physical circuit

logical circuit

The loss of power a signal suffers as it travels from the transmitting computer to a receiving computer is: - white noise - spiking - attenuation - intermodulation noise - echo

attenuation

The _____________ of a circuit determines a circuit's capacity. frequency -bandwidth -phase -amplitude -loudness

bandwidth

Gaining an understanding of the current application system and messages provides a _________ against which future design requirements can be gauged. -backplane -baseline -turnpike document -wish list -RFP

baseline

Errors on a network can occur: - only on dial-up type of circuits - because of noise on the line - only on poorly maintained networks - only due to Gaussian noise - only due to lightning strikes

because of the noise on the line

Which type of digital signaling would experience fewer errors because it has more distinct signals? -unipolar -serial -bipolar -attenuation -Huffman encoding signal

bipolar

A circuit that is filled almost to its capacity and thus is the critical point that determines whether users get good or bad response times is referred to as a(n) -bottleneck -building backbone -breakneck -congested network -e-commerce edge

bottleneck

The network architecture component that is sometimes referred to as the distribution layer is the -LAN -building backbone -campus backbone -enterprise edge

building backbone

__________ is a line-of-sight type of wireless media. -coaxial cable -microwave -radio -twisted pair -fiber optic

microwave

The acronym, Modem, stands for _________________. -multiplexing/demultiplexing -more/demote -Mode-M technique -modulator/demodulator -Mod emulation technique

modular/demodulator

____________ refers to changing the shape of the sound wave in different ways to represent a 1 or a 0. -digitizing. -sampling -modulation -demodulation -shaping

modulation

Estimating the cost of a network is ______ complex than estimating the cost of one new piece of data processing hardware. -much more -much less -about the same -exactly the same -a little more

much more

Frequency division multiplexing: -operates by statistically time slicing the signal -operates by dividing the signal into different frequencies -uses a codec that divides signals into different channels -operates by time slicing the signal -operates by light dividing the signal

operates by dividing the signal into different frequencies

Which of the following is a characteristic of sound waves that can be modulated to convert digital data into analog signals? -phase -attenuation -bipolar -bandwidth -codec

phase

Estimating the size and type of the "standard" and "advanced" network circuits is called _________. -needs categorization -turnpike design -cost assessment -capacity planning

capacity planning

With contention: - computers wait until the circuit is free before they send data - the server or front end processor works consecutively through a list of clients to determine who should have access to the media - the front end processor must wait for a response from the polled client or terminal - one computer starts the poll and passes it to the next computer on the multipoint circuit - there is never a chance for "collision," or two computers trying to send data at the same time

computers wait until the circuit is free before they send data

With __________ ARQ, the sender immediately sends the next message or packet of data. - continuous - immediate - open window - stop-and-wait - halt and be recognized (HBR)

continuous

In which type of modulation is a 1 distinguished from a 0 by shifting the direction in which the wave begins? -bandwidth modulation -amplitude modulation -frequency modulation -phase modulation

phase modulation

Another term for impulse noise is: - Gaussian noise - spikes - attenuation - cross-talk - intermodulation noise

spikes

When sending four bits at a time using frequency modulation, the number of different frequency levels that would be needed would be _______. -24 -16 -8 -4

16

The probability of detecting an error, given that one has occurred, using parity checking is about: - 100% - 0% - 50% - 75% - 98%

50%

How many bits are required to sample an incoming signal 4000 times per second using 64 different amplitude levels? -32 -16 -8 -6

6

If the highest frequency of a circuit is 10KHZ and the lowest frequency is 900 Hz, the bandwidth available for this circuit is : -890 Hz -8900 HZ -9100 Hz -9Khz -890 KHz

9100 Hz

___________ refers to the amount of data transmitted on a circuit. -Circuit loading -Leading edge deployment -Capacity planning -Calculating message volumes -Requirements documentation

Circuit loading

Another term for stop-and-wait ARQ is sliding window. - True - False

False

Digital transmission produces more errors than analog transmission. True False

False

Fiber optic cable carries signals in traditional electrical form. True False

False

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

False

Impulse noise is caused by the thermal agitation of electrons. - True - False

False

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

False

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

False

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

False

Multiplexing increases the cost of provisioning network circuits. True False

False

Needs analysis is the final step in the building block approach to network design. True False

False

Parity checking can only detect an error when an even number of bits are switched. - True - False

False

Serial mode transmission is much faster than parallel mode transmission. True False

False

The turnpike effect results when a network is used at a much lower rate than was anticipated when it was designed. True False

False

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. True False

False

A traditional network design approach follows a structured systems analysis and design process similar to that used in building applications. True False

True

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

True

Attenuation refers to the loss of signal strength. - True - False

True

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

True

Cyclical redundancy check is one of the most popular polynomial error-checking schemes True False

True

Data compression can increase the throughput of a communication link. True False

True

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

True

Forward error correction is commonly used in satellite transmission. True False

True

HDLC is very similar to the SDLC synchronous data link protocol. - True - False

True

If a computer transmits a message containing "ABC" and the destination computer receives "abc" as the message, the message is corrupted. - True - False

True

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

True

The "local loop" refers to the wires that run from the customer premises to the telephone switch of the telephone company. True False

True

The campus backbone is usually faster than the backbones used inside buildings. True False

True

-------CH 3--------

--------CH 3----------

------CH 6---------

-------CH 6--------

------CH 4------

-----CH 4------

-----PRACTICE TEST 2------ (avoiding repeats)

-----PRACTICE TEST 2------ (avoiding repeats)

A coding scheme that uses 10 bits to represent each character is capable of representing _________ different characters. -256 -20 -200 -512 -1024

1024

The typical range of human hearing is: 0 to 4,000 Hz 0 to 1,200 Hz 20 to 14,000 Hz 0 to 300 Hz 0 to 56,000 Hz

20 to 14,000 Hz

Which of the following would not be a type of circuit that needs to be considered when planning for technology design capacity? -1000 Mbps -Ethernet -10 Mbps -100 Mbps -1 Gbps

Ethernet

____________ refers to bits that have been changed, in error, from 1 to 0, or vice versa, in a data transmission. - Contracted bits - Polled bits - Inverse multiplexed bits - Flipped bits - Bit delineation

Flipped bits

_____________ can be thought of as dividing the circuit horizontally. -Statistical frequency division multiplexing -Wavelength division multiplexing -Time division multiplexing -Frequency division multiplexing

Frequency division multiplexing

__________ controls errors by detecting and correction them at the receiving end without retransmission of the original message - Hamming code - Huffman encoding - Front end processing - Wave division multiplexing - Hub polling

Hamming code

__________can obliterate a group of bits, causing a burst error. - Cross-talk - Attenuation - Impulse noise - Intermodulation noise - White noise

Impulse noise

Which of the following is true with respect to the data link layer? -It accepts streams of bits from the application layer. -It is responsible for encoding the bit-stream as a series of electronic voltages -It performs error detection. -It performs routing functions.

It performs error detection.

______________ refers to the time it takes for a signal to travel from sender to recipient (highly exaggerated with satellite transmission). -Line-of-sight effect -Multimode index -Saturation effect -Raindrop attenuation -Propagation delay

Propagation delay

RFP stands for: -Request for Proposal -Ring Fault Path -Routing File Protocol -Record Facsimile Program -Redundant File Protocol

Request for Proposal

________ is used to model the behavior of the planned communication network once the proposed network map is complete. -Implementation -Post-implementation review -Documentation -Simulation -Training users

Simulation

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

True

Overhead bits are used for error checking and marking the start and end of characters and packets. - True - False

True

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

True

Which of the following is not a type of synchronous protocol? - SDLC - VT100 - HDLC - Ethernet - PPP

VT100

Using parity, the probability for detecting an error, given that one has occurred, is: - about 50% for either even or odd parity - about 70% for even parity and 30% for odd parity - about 30% for even parity and 70% for odd parity - about 0% for either even or odd parity - about 100% for either even or odd parity

about 50% for either even or odd parity

Which of the following are not costs that are generally considered during the cost assessment stage of the building-block network design process? -cost of advertising brochures for new products to be offered by an organization -internetworking devices cost -network management costs -circuit costs -software costs for network operating system

cost of advertising brochures for new products to be offered by an organization

With the two-tier client-server architecture, the server is responsible for the ________ logic. -application -presentation -data access -session

data access

Transmission speeds: -are the same among all media -are not a factor in selecting a media because all media have more than enough speed to serve current communication demands -are a constant, 56Kbps, for all media types -differ widely among media -always have a direct correlation with security

differ widely among media

The network architecture component that is a special LAN with a group of servers that enables electronic data exchange of between the organization and the external entities it does business with is called the -LAN -building backbone -data center -enterprise edge -e-commerce edge

e-commerce edge

Asynchronous transmission: - is used to transmit each character simultaneously with all other characters - has a pre-determined, fixed time between sending characters - is typically used on multipoint half duplex circuits - uses a continuous series of start bits as an idle signal - each character is transmitted independently of all other characters

each character is transmitted independently of all other characters

When a signal is reflected back to the transmitting equipment, it is called a(n) _________. - white noise - echo - crosstalk - attenuation - impulse noise

echo

Which of the following media has the lowest error rates and the highest transmission speeds? -Coaxial cable -unshielded twisted pair -shielded twisted pair -fiber optic cable -infrared

fiber optic cable

Which of the following is a way to sell the network proposal to management? -talk about upgrades from 10Mbps to 100Mbps -give many details about using routers vs. gateways for a particular connection -concentrate on a discussion about token ring vs. Ethernet protocol -focus on the growth in network use -discuss SNA architecture

focus on the growth in network use

Having a conversation with someone using a cellular phone is an example of _________ transmission. -simplex -full-duplex -half-duplex -digital

full-duplex

To get more "bandwidth" in a digital transmission, you must: -increase the range of frequencies available for a transmission -increase the loudness per transmission -decrease the bits per second transmission speed -increase the phase shifts per transmission -decrease the baud rate per transmission

increase the range of frequencies available for a transmission

In communication protocols, _________ are used to convey the user's meaning - information bits -overhead bits -stop bits -start bits -flag bits

information bits

Media access control: - is not very important in point-to-point with full duplex configuration - is not very important in local area networks - is not very important in a point-to-point with a half duplex configuration - is not very important in a multipoint configuration - does not control when computers transmit

is not a very important in point-to-point with full duplex configuration

Synchronous transmission: - cannot be used on multipoint circuits - is used to send one character at a time - uses start bits before each character to be sent - uses stop bits after each character to be sent - is used to transmit a "frame" or "packet" of data at a time

is used to transmit a "frame" or "packet" of data at a time

Which of the following is not a key deliverable for the cost assessment step of the building-block network design process? -RFP -list of wish list requirements -revised physical network diagram -business case, defined in business objectives and business language, that supports the network design -none of the above is an appropriate choice

list of wish list requirements

Time (non-statistical) division multiplexing differs from frequency division multiplexing because it: -does not share a communication circuit -splits the communication circuit vertically (with time slots) instead of horizontally -increases the wavelength and phase angles of the baseband frequency used for transmission -moves the baseband of a circuit by shifting it to a higher frequency -reduces baseband signal velocity more than frequency division multiplexing

splits the communication circuit vertically (with time slots) instead of horizontally

In the technology design stage of network design, -the fundamental technology/protocols to be chosen have no relationship with the circuit capacity -the decision for fundamental technology/protocols can be made without considering circuit capacity -the decision for circuit capacity can be made without considering fundamental technology/protocols -the decisions for fundamental technology/protocols and circuit capacity are interrelated

the decisions for fundamental technology/protocols and circuit capacity are interrelated

In needs analysis: -the costs of different physical network design alternatives are assessed -the goal is to understand what users and applications the network will support -the geographic scope is not an important consideration -a baseline of current operations is not important -the rate of growth of network traffic is not an issue

the goal is to understand what users and applications the network will support

The type of media usually installed on homes and businesses by the telephone company is called ____________. -fiber optic cable -coaxial cable -twisted pair -phone cable -phone wire

twisted pair

In general, controlled approaches: - work better than contention approaches for small networks that have low usage - work better than contention approaches for large networks that have high usage - work better than contention approaches for all sizes of networks - do not require a host, server, or active monitor to assign media access control - have many collisions

work better than contention approaches for large networks that have high usage