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Finals in DigiComm

Total questions: 100

Worksheet time: 1hrs 7mins

Name
Class
Date
1.

Multiplexing is the process of

a)

several signal sources transmitting simultaneously to a receiver on a common frequency

b)

sending the same signal over multiple channels to multiple destination

c)

transmitting multiple signals over multiple channels

d)

sending multiple signals simultaneously over a single channel

2.

In FDM, multiple signals

a)

transmit at different times

b)

share a common bandwidth

c)

use multiple channels

d)

modulate one another

3.

Each signal in an FDM system

a)

modulates a subcarrier

b)

modulates the final carrier

c)

is mixed with all the others before modulation

d)

serves as a carrier

4.

Which of the following is not a typical FDM application

a)

telemetry

b)

stereo broadcasting

c)

telephone

d)

secure communications

5.

The circuit that performs demultiplexing in an FDM system is a(n)

a)

op amp

b)

bandpass filter

c)

discriminator

d)

subcarrier oscillator

6.

In TDM, multiple signals

a)

share a common bandwidth

b)

modulate subcarriers

c)

are sampled high speeds

d)

take turns transmitting

7.

In TDM, each signal may use the full bandwidth of the channel

a)

true

b)

false

c)

none of the choices

8.

Converting analog signals to digital is done by sampling and

a)

quantizing

b)

companding

c)

pre-emphasis

d)

mixing

9.

A quantizer is a(n)

a)

multiplexer

b)

demultiplexer

c)

A/D converter

d)

D/A converter

10.

Emphasizing low-level signals and compressing higher-level signals is called

a)

quantizing

b)

companding

c)

pre-emphasis

d)

sampling

11.
the frequency of the analog carrier signal  is varied proportional to the digital information signal.
a)
ASK
b)
PSK
c)
FSK
d)
MSK
12.
a)
ASK
b)
PSK
c)
FSK
d)
QAM
13.
a)
ASK
b)
PSK
c)
FSK
d)
QAM
14.
a)
ASK
b)
PSK
c)
FSK
d)
QAM
15.

What is not the advantages of digital communications?

a)

Ability to recover lost information through error correction

b)

Immunity to noise ( ability to function in the presence of noise)

c)

Added security with data encryption and decryption

d)

Ability to transmit signal below the noise level all the time

16.

What are the three different types of multiplexing?

a)

TDMA, FDMA, CDMA

b)

TDAM, FDMA, SDMA

c)

TDD, FDMA, CDMA

d)

FDD, TDD, TDMA

17.

What is the minimum sampling rate required in order to recovered the information signal?

a)

The sampling rate must be at least the same as the highest frequency of the intelligence signal.

b)

The sampling rate must be at least 2 times the highest frequency of the intelligence signal.

c)

The sampling rate must be at least 1.5 times the highest frequency of the intelligence signal.

d)

The sampling rate must be at least 3 times the highest frequency of the intelligence signal.

18.

is the transmittal of digital signals between two

or more points in a communications system

a)

Digital signal processing

b)

signal processing

c)

digital transmission

d)

digital processing

19.

The primary advantage of digital transmission over analog transmission is

a)

Better compatibility in multiplexing

b)

Noise Immunity

c)

regeneration

d)

Signal Processing

20.

Digital signals are also better suited than analog signals for processing and combining using a technique called

a)

Multiplexing

b)

Signal Processing

c)

regeneration

d)

digital transmission

21.

digital transmission systems are more resistant to analog systems to additive noise because they use signal ___________ rather than signal amplification.

a)

regeneration

b)

enhancing

c)

multiplexing

d)

cancelling

22.

•The analog signal is sampled and converted to a fixed length, serial binary number for transmission

a)

PCM

b)

PAM

c)

PWM

d)

PPM

23.

–The Nyquist sampling theorem establishes the minimum sampling rate (fs) that can be used for a given PCM system

a)

PCM

b)

Sampling Rate

c)

PAM

d)

alias

24.

is the process of converting an infinite number of possibilities to a finite number of conditions

a)

Quantization

b)

overload distortion

c)

quantum.

d)

resolution

25.

What is the size of MAC Address?

a)

16-bits

b)

32-bits

c)

48-bits

d)

64-bits

26.

This is what happens if two devices on the same Ethernet network determine the network is free, but attempt to transmit data at exactly the same time.

a)

overlap

b)

crossover

c)

collision

d)

None of the above

27.

This describes how the Ethernet protocol regulates communication among connection points.

a)

Carrier Sense Multiple Access/Collision Detect

b)

Discontinuous transmission

c)

Aggregator

d)

Wait and response

28.

In ________ each station sends a frame whenever it has a frame to send.

a)

pure ALOHA

b)

slotted ALOHA

c)

both (a) and (b)

d)

neither (a) nor (b)

29.

In pure ALOHA, the vulnerable time is ______ the frame transmission time.

a)

the same as

b)

two times

c)

three times

d)

none of the above

30.

In __________, each station is forced to send only at the beginning of the time slot.

a)

pure ALOHA

b)

slotted ALOHA

c)

both (a) and (b)

d)

neither (a) nor (b)

31.

Collision can still occur if propagation delay shows two nodes not hear each other's transmission

a)

True

b)

False

32.

FDM consists of

a)

upstream frequency channels

b)

downstream frequency channels

c)

all of above

33.

________________ error detection method uses one\'s complement arithmetic.

a)

Simple parity check

b)

Two-dimensional parity check

c)

CRC

d)

Checksum

34.

Which error detection method consists of just one redundant bit per data unit?

a)

Simple parity check

b)

Two-dimensional parity check

c)

CRC

d)

Checksum

35.

In cyclic redundancy checking, what is the CRC?

a)

Divisor

b)

Quotient

c)

Dividend

d)

Remainder

36.

A ____________________ error means that two or more bits in the data unit have change.

a)

bit

b)

double bit

c)

burst

d)

none of the above

37.

In ________ error correction, the receiver asks the sender to send the data again.

a)

forward

b)

backward

c)

retransmission

d)

redirection

38.

The checksum of 1111 and 1111 is _________.

a)

0000

b)

0001

c)

0011

d)

1111

39.

The _____of errors is relatively more difficult than the error ______.

a)

correction; detection

b)

detection; correction

c)

creation; correction

d)

creation; detection

40.

A simple parity-check code can detect __________ errors.

a)

single bit

b)

burst

c)

an even-number of

d)

an odd-number of

41.

In PPP, the ________ is responsible for establishing, maintaining, configuring, and terminating links.

a)

PAP

b)

CHAP

c)

LCP

d)

NCP

42.

HDLC is an acronym for _______.

a)

Half-duplex digital link combination

b)

Host double-level circuit

c)

High-duplex line communication

d)

High-level data link control

43.

_______ control refers to a set of procedures used to restrict the amount of data that the sender can send before waiting for acknowledgment.

a)

Flow

b)

Error

c)

Transmission

d)

None of the choices

44.

______ control refers to methods of error detection and correction.

a)

Flow

b)

Error

c)

Transmission

d)

None of the choices

45.

Byte stuffing means adding a special byte to the data section of the frame when there is a character with the same pattern as the ______.

a)

trailer

b)

flag

c)

header

d)

none of the choices

46.

The most common protocol for point-to-point access is the Point-to-Point Protocol (PPP), which is a _________protocol.

a)

byte-oriented

b)

bit-oriented

c)

character-oriented

d)

none of the choices

47.

_________framing uses two categories of protocols: character-oriented and bit-oriented.

a)

Standard

b)

Fixed-size

c)

Variable-size

d)

none of the choices

48.

In a ________ protocol, the data section of a frame is a sequence of characters.

a)

bit-oriented

b)

character-oriented

49.

In _______ framing, there is no need for defining the boundaries of frames.

a)

standard

b)

fixed-size

c)

variable-size

d)

none of the choices

50.

In a _________ protocol, the data section of a frame is a sequence of bits.

a)

bit-oriented

b)

byte-oriented

51.

In ________ framing, we need a delimiter (flag) to define the boundary of two frames.

a)

standard

b)

fixed-size

c)

variable-size

d)

none of the choices

52.

Bit stuffing means adding an extra 0 to the data section of the frame when there is a sequence of bits with the same pattern as the ________.

a)

trailer

b)

flag

c)

header

d)

none of the choices

53.

In PPP, ________ is a simple authentication procedure with a two-step process:

a)

CHAP

b)

PAP

c)

LCP

d)

NCP

54.

Data link control deals with the design and procedures for ______ communication.

a)

node-to-node

b)

process-to-process

c)

host-to-host

d)

none of the above

55.

What is layer 7 of the OSI model?

a)

Application

b)

Presentation

c)

Session

d)

Transport

56.

What is layer 6 of the OSI model?

a)

Spooky

b)

Presentation

c)

Session

d)

Transport

57.

What is layer 5 of the OSI model?

a)

Presentation

b)

Session

c)

Transport

d)

Network

58.

What is layer 4 of the OSI model?

a)

Session

b)

Transport

c)

Network

d)

Data Link

59.

What is layer 3 of the OSI model?

a)

Transport

b)

Network

c)

Data Link

d)

Physical

60.

What is layer 2 of the OSI model?

a)

Transport

b)

Network

c)

Data Link

d)

Physical

61.

What is layer 1 of the OSI model?

a)

Application

b)

Presentation

c)

Data Link

d)

Physical

62.

What are sets of clearly defined rules, regulations, standards, and procedures that enable hardware and software developers to make devices and applications that function properly at a particular layer?

a)

Protocol

b)

TCP/IP

c)

Networks

d)

Interconnection

63.

What does NIC stand for?

a)

Network Interface Card

b)

Network Interconnect Card

c)

Network Interchange Card

d)

Network Integrated Card

64.

What does LLC stand for?

a)

Limited liability company

b)

Logical link control

c)

LL Cool J

d)

Lightly linked cord

e)

Life line cable

65.
What does "MAC" stand for in "MAC Address"?
a)
Media Access Control
b)
Mandatory Access Control
c)
Micro Access Control
d)
Media Access Certificate
66.
Which of these is usually encoded in a MAC address?
a)
Manufacturer's identification number
b)
X.509 SSL certificate
c)
Checksum of packet data
d)
IEEE 802 network segment index
67.
At which layer of the OSI model are MAC Addresses usually used?
a)
Data Link Layer
b)
Transport Layer
c)
Physical Layer
d)
Application Layer
68.
What does "NIC" stand for?
a)
Network Interface Controller
b)
National Internal Communication
c)
Network Interface Communication
d)
Native Interface Communication
69.
Where is a MAC address most likely to be stored?
a)
ROM
b)
RAM
c)
SDRAM
d)
CD-ROM
70.
What are MAC addresses used to identify?
a)
Hardware
b)
Networking software
c)
DSI-Ware
d)
Firmware
71.

™The application layer of TCP/IP protocol suite comprised of how many layers equivalent to OSI model?

a)

seven

b)

four

c)

five

d)

three

72.

™It is the TCP/IP layer responsible for moving frames from one hop to the next.

a)

Internet

b)

Data-link

c)

Host-to-Network

d)

Network

73.

Data-link and physical layers in OSI are represented in the TCP/IP as the ______

a)

Application

b)

Transport

c)

Internet

d)

Host-to-network

74.

The network layer in OSI is represented in TCP/IP as ______.

a)

Host-to-Network

b)

Internet

c)

Transport

d)

Application

75.

™It is used to enable us to divide a complex task into several smaller and simple tasks

a)

Protocol layering

b)

Interface

c)

Peer-to-peer

d)

modules

76.

™It is the TCP/IP layer responsible for translation, compression, and encryption.

a)

Session

b)

Transport

c)

Application

d)

ost-to-network

77.

The passing of the data and network information down and back up through the layers of the receiving device is made possible by an _______ .

a)

Protocol suite

b)

service

c)

interface

d)

modularity

78.

The number of layers the original TCP/IP protocol suite .

a)

four

b)

five

c)

six

d)

seven

79.

Name the addressing used in host-to-network in TCP/IP model.

a)

port

b)

physical

c)

logical

d)

specific

80.

PDU for Application layer in TCP/IP

a)

segment

b)

frame

c)

data

d)

packet

81.

The TCP/IP PDU sed in host-to-network layer

a)

segment

b)

packet

c)

frame

d)

datagram

82.

Addressing used in transport layer of TCP/IP.

a)

specific

b)

port

c)

logical

d)

physical

83.

Address used in Application layer of TCP/IP?

a)

specific

b)

port

c)

logical

d)

physical

84.

Address used in the Internet layer of TCP/IP

a)

specific

b)

port

c)

logical

d)

physical

85.

PDU used in the Internet layer of TCP/IP

a)

segment

b)

packet

c)

datagram

d)

frames

86.

_____ is the protocol used by the transport layer for connectionless

a)

IP

b)

UDP

c)

TCP

d)

NTP

87.

______is protocol used by the Transport layer for connection -oriented

a)

IP

b)

UDP

c)

TCP

d)

NCP

88.

________layer links the two subgroups in TCP/IP and ensures that what the lower layers have transmitted is in a form that the upper layers can use

a)

Application

b)

Transport

c)

physical, data-link and network

d)

session

89.

________deal with the physical aspects of moving data from one device to another

a)

User Support Layer

b)

Link Layer

c)

Transport Layer

d)

Network Support Layers

90.

How many bus lines are used in serial transmission?

a)

1

b)

2

c)

3

d)

4

91.

How does an ARQ check work?

a)

The sender resends the data if it does not receive confirmation after a certain amount of time

b)

The sender compares the sent data to the original and sees if an error occurred

c)

The receiver checks with the sender to find out whether the data was sent correctly

d)

The sender checks whether the receiver has received the data by performing a calculation on a check digit

92.

Which transmission media has the highest transmission speed in a network?

a)

coaxial cable

b)

twisted pair cable

c)

optical fiber

d)

electrical cable

93.

Bits can be send over guided and unguided media as analog signal by

a)

digital modulation

b)

amplitude modulation

c)

frequency modulation

d)

phase modulation

94.

Which of the following performs modulation and demodulation?

a)

fiber optics

b)

switch

c)

modulator

d)

modem

95.

In fiber optics, the signal is _______ waves.

a)

light

b)

radio

c)

infrared

d)

very low frequency

96.

Transmission media lie below the _______ layer.

a)

physical

b)

network

c)

transport

d)

application

97.

Twisting in a twisted-pair help reduce the __________.

a)

length

b)

cost

c)

noise

d)

None of the choices are correct

98.

In electromagnetic spectrum for wireless communication, reserved range for Radio waves and microwaves is known as

a)

ground propagation

b)

sky propagation

c)

line-of-sight propagation

d)

None

99.
Which is NOT an advantage of broadband over dial up?
a)
Can use the itnernet the same time as the land line phone
b)
No need to connect to the interent before using
c)
It is faster
d)
Can use anywhere around the house
100.
'Enables connection to the internet wirelessly (provided there's a network!)'
a)
Dial up
b)
Broadband
c)
WiFi
d)
Fibre optic

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