Cnt3004 Exam1

Front 1

A ________________ connection provides a dedicated link between two devices.

Back 1

point-to-point

Front 2

One of the primary disadvantages in a ___________________ topology is that one break in the cable media can stop all data transmissions on the network segment.

Back 2

Bus

Front 3

The ______________________ is the physical path over which a message travels.

Back 3

medium

Front 4

As the data packet moves from the upper to the lower layers, headers are _______.

Back 4

Added

Front 5

In the OSI model, as a data packet moves from the lower to the upper layers, headers are _______.

Back 5

removed

Front 6

In the OSI model, encryption and decryption are functions of the ________ layer.

Back 6

presentation

Front 7

In the OSI model, what is the main function of the transport layer?

Back 7

process-to-process message delivery

Front 8

In the OSI model, when data is transmitted from device A to device B, the header from A's layer 5 is read by B's _______ layer.

Back 8

session

Front 9

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

Back 9

physical

Front 10

The _______ layer changes bits into electromagnetic signals.

Back 10

Physical

Front 11

The _______ layer lies between the network layer and the application layer.

Back 11

Transport

Front 12

The ______ layer adds a header to the packet coming from the upper layer that includes the logical addresses of the sender and receiver.

Back 12

network

Front 13

The ______ layer is responsible for moving frames from one hop (node) to the next.

Back 13

data link

Front 14

The Internet model consists of _______ layers.

Back 14

Five

Front 15

The Internetworking Protocol (IP) is a ________ protocol.

a - reliable
b - connection-oriented
c - both a and b
d - none of the above

Back 15

none of the above

Front 16

The OSI model consists of _______ layers.

Back 16

seven

Front 17

The physical layer is concerned with the movement of _______ over the physical medium.

Back 17

bits

Front 18

The process-to-process delivery of the entire message is the responsibility of the _______ layer.

Back 18

Transport

Front 19

To deliver a message to the correct application program running on a host, the _______ address must be consulted.

Back 19

port

Front 20

When a host on network A sends a message to a host on network B, which address does the router look at?

Back 20

logical

Front 21

When data are transmitted from device A to device B, the header from A's layer 4 is read by B's _______ layer.

Back 21

Transport

Front 22

Which of the following is an application layer service?

Back 22

All the above

Front 23

Why was the OSI model developed?

Back 23

Standards were needed to allow any two systems to communicate

Front 24

A port address in TCP/IP is ______ bits long.

Back 24

16

Front 25

Ethernet uses a ______ physical address that is imprinted on the network interface card (NIC).

Back 25

6-byte

Front 26

Data can be ________.

1. analog
2. digital
3. (a) or (b)
4. none of the above

Back 26

(a) or (b)

Front 27

_______ data are continuous and take continuous values.

Back 27

analog

Front 28

_______ data have discrete states and take discrete values.

Back 28

Digital

Front 29

A periodic signal completes one cycle in 0.01 s. What is the frequency?

Back 29

100 Hz

Front 30

As frequency increases, the period ________.

Back 30

decreases

Front 31

A signal is measured at two different points. The power is P1 at the first point and P2 at the second point. The dB is 0. This means ________.

Back 31

P2 equals P1

Front 32

A sine wave in the ______ domain can be represented by one single spike in the _____ domain.

Back 32

time; frequency

Front 33

A sine wave is ________.

Back 33

periodic and continuous

Front 34

Before data can be transmitted, they must be transformed to ________.

Back 34

electromagnetic signals

Front 35

For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate.

Back 35

noiseless

Front 36

For a ______ channel, we need to use the Shannon capacity to find the maximum bit rate.

Back 36

noisy

Front 37

Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is ________ that of A.

Back 37

twice

Front 38

If the bandwidth of a signal is 15 KHz and the lowest frequency is 52 KHz, what is the highest frequency?

Back 38

67 KHz

Front 39

If the maximum amplitude of a sine wave is 2 V, the minimum amplitude is ________ V.

Back 39

-2

Front 40

In a frequency-domain plot, the horizontal axis measures the ________.

Back 40

frequency

Front 41

What is the bandwidth of a signal that ranges from 10 MHz to 45 MHz?

Back 41

35 MHz

Front 42

In a time-domain plot, the horizontal axis is a measure of ________.

Back 42

time

Front 43

The _________ product defines the number of bits that can fill the link.

Back 43

bandwidth-delay

Front 44

________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.

Back 44

Noise

Front 45

________ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium.

Back 45

Attenuation

Front 46

________ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal.

Back 46

Distortion

Front 47

The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal.

Back 47

bandwidth

Front 48

_______ describes the position of the waveform relative to time 0.

Back 48

Phase

Front 49

Baseband transmission of a digital signal is possible only if we have a ____ channel.

Back 49

low-pass

Front 50

When propagation speed is multiplied by propagation time, we get the ________.

Back 50

distance a signal or bit has traveled