Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CSCI 3306 > Exam 1 > Flashcards

Exam 1 Flashcards

1
Q

The word ________ refers to information presented in whatever form is agreed upon by the parties creating and using it.

A

data

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

________ is the exchange of data between two devices via some form of transmission medium such as a wire cable.

A

Data communications

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The effectiveness of a data communications system depends on four fundamental characteristics. Which one of the following is not one of those four fundamental characteristics?

delivery

accuracy

timeliness

effectiveness

A

effectiveness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Packets which are small segments of a larger messages can arrive out of sequence and at different times. Which one of the following refers to this variation in the packet arrival time?

Jitter

Delay

Segmentation

None of the other choices is correct answer

A

Jitter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

A data communications system has five components. Which one of the following is not one of those five components?

Message

Sender

Receiver

Data

Protocol

A

Data

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

In data communications, text is represented as a _____________.

A

Bit patter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Which one of the following is not one of the transmission modes?

simplex

duplex

half-duplex

full-duplex

A

duplex

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Which of the following are the valid types of line configurations?

hybrid

point-to-point

multi-point

single point

A

all answers are correct

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Assume six devices are arranged in a mesh topology. How many cables are needed?

A

15

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Assume six devices are arranged in a mesh topology. How many ports are needed for each device?

A

5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The _________ address, also known as the link address, is the address of a node as defined by its LAN or WAN.

A

transport

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The unit of data at the network layer is known as __________.

A

datagram

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Four levels of addresses are used in an internet following the TCP/IP protocols. Which one of the following is not one of these addresses?

physical

logical

port

transport

A

transport

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

A local area network (LAN) is defined by _______________.

A

the geometric size of the network

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The length of address at the datalink layer is ________ bits.

A

48

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The _________ layer is responsible for delivering data units from one station to the next without errors.

A

data-link

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

The length of address at the transport layer is ________ bits.

A

16

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

The _______ uniquely defines a host on the Internet.

A

IP address

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

The _________ layer is responsible for the source-to-destination delivery of a packet across multiple network links.

A

network

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

when the communication is complex, we may need to divide the task between different layers, in which case we need a _________ at each layer.

A

protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

The length of address (IPv4) at the network layer is ________ bits.

A

32

22
Q

The _________ layer coordinates the functions required to transmit a bit stream over a physical medium.

A

physical

23
Q

In data communications and networking, a _________ defines the rules that both the sender and receiver and all intermediate devices need to follow to be able to communicate effectively.

A

protocol

24
Q

The unit of data at the transport layer is known as __________.

A

segment

25
Q

The __________ layer enables the users to access the network.

A

application

26
Q

The unit of data at the physical layer is known as __________.

A

bit

27
Q

True or False:

TCP/IP is a hierarchical protocol suite made up of seven layers: physical, data-link, network, transport, session, presentation, and application

A

False

28
Q

The ________ address identifies a process on a host.

A

port

29
Q

The _________ layer is responsible for the process-to-process delivery of the entire message.

A

transport

30
Q

The unit of data at the data-link layer is known as __________.

A

frame

31
Q

The ________ can be analog or digital.

A

signals

32
Q

An _________ signal takes many values; a digital signal takes a limited number of values.

A

analog

33
Q

A simple periodic analog signal is a _________ which cannot be decomposed into simpler signals

A

sine wave

34
Q

The ________ refers to the amount of time, in seconds, a signal needs to complete one cycle.

A

period

35
Q

The _________, measured in hertz (Hz), refers to the number of periods in 1 s.

A

frequency

36
Q

The ________ is the distance a simple signal can travel in one period.

A

wavelength

37
Q

The range of frequencies contained in a composite signal is its _______.

A

bandwidth

38
Q

The _______ is the number of bits sent in 1 s, expressed in bits per second (bps).

A

bit rate

39
Q

The term _____ describes the position of the waveform relative to time 0.

A

phase

40
Q

Assume we need to download text documents at the rate of 200 pages per minute. What is the required bit rate of the channel? A page is an average of 24 lines with 80 characters in each line. If we assume that one character requires 8 bits, the bit rate is

A

3.072

41
Q

The _________ is the distance 1 bit occupies on the transmission medium.

A

bit length

42
Q

There are three causes of signal impairment which are all of the following except

A

jitter

43
Q

__________ means a loss of energy.

A

attenuation

44
Q

__________ means that the signal changes its form or shape.

A

distortion

45
Q

To show that a signal has lost or gained strength, engineers use the unit of the _________ which measures the relative strengths of two signals or one signal at two different points.

A

decibel

46
Q
A
47
Q

True or False:

If a signal travels from point 1 to point 2, the attenuation is computed by the formula dB = 10 log10 (P2/P1), where P1 and P2 are the powers at point 1 and 2.

A

True

48
Q

Suppose a signal travels through a transmission medium and its power is reduced to one-half. The loss of the power is which one of the following?

A

-3

49
Q

For a noiseless channel, the _______ bit rate formula defines the theoretical maximum bit rate which is given by the formula: BitRate = 2 × B × log2 L, where B is the bandwidth and L is the number of signal levels used to represent data.

A

Nyquist

50
Q

_______ capacity determines the theoretical highest data rate for a noisy channel which is given by the formula: Capacity, C = B × log2 (1 + SNR), where B is the bandwidth and SNR is the signal to noise ratio.

A

Shannon

51
Q

Consider an extremely noisy channel in which the value of the signal-to-noise ratio is almost zero. In other words, the noise is so strong that the signal is faint. For this channel what would be the capacity C?

A

0

CSCI 3306 (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions