Question 1

Which of the following is an example of physical layer vulnerability?
A)mac address spoofing
B)physical theft of data
C)route spoofing
D)weak or non-existent authentication

Accepted Answer

Physical theft of data is a direct vulnerability of the physical layer, as it involves unauthorized physical access to hardware or data storage devices, compromising the security of data by physically removing or accessing the device.

Question 2

Which of the following is an example of data-link layer vulnerability?
A)mac address spoofing
B)physical theft of data
C)route spoofing
D)weak or non-existent authentication

Accepted Answer

MAC address spoofing is a vulnerability at the data-link layer (Layer 2) of the OSI model, where an attacker can masquerade as another device by changing their device's MAC address.

Question 3

Which of the following is an example of network layer vulnerability?
A)mac address spoofing
B)physical theft of data
C)route spoofing
D)weak or non-existent authentication

Accepted Answer

Route spoofing is a network layer vulnerability where an attacker manipulates the routing table by sending false updates, leading to traffic being redirected or intercepted. This directly affects the network layer's ability to accurately deliver packets to their intended destinations.

Question 4

Which of the following is an example of physical layer vulnerability?
A)mac address spoofing
B)route spoofing
C)weak or non-existent authentication
D)keystroke & other input logging

Accepted Answer

The answer of Which of the following is an example...

Question 5

Which of the following is an example of data-link layer vulnerability?
A)physical theft of data
B)vlan circumvention
C)route spoofing
D)weak or non-existent authentication

Accepted Answer

VLAN circumvention is an example of a data-link layer vulnerability because it exploits weaknesses in the VLAN configuration, which operates at the data-link layer (Layer 2) of the OSI model.

Question 6

Bits can be sent over guided and unguided media as analog signal by                        
A)digital modulation
B)amplitude modulation
C)frequency modulation
D)phase modulation

Accepted Answer

Digital modulation is the process of converting digital data into an analog signal for transmission over various media.

Question 7

The portion of physical layer that interfaces with the media access control sublayer is called                        
A)physical signalling sublayer
B)physical data sublayer
C)physical address sublayer
D)physical transport sublayer

Accepted Answer

The physical signalling sublayer is the part of the physical layer that interfaces with the media access control (MAC) sublayer, handling the specifics of signaling and data transmission over the physical medium.

Question 8

In the digital communication system, signals in different frequency bands are
A)orthogonal
B)non orthogonal
C)orthogonal & non orthogonal
D)none of the mentioned

Accepted Answer

In digital communication systems, signals in different frequency bands are typically orthogonal to avoid interference and allow for efficient multiplexing.

Question 9

Properties of impulse function are
A)symmetry
B)time scaling
C)shifting
D)all of the mentioned

Accepted Answer

The impulse function, also known as the delta function, possesses properties of symmetry, time scaling, and shifting, making all of the mentioned options correct.

Question 10

Properties of Fourier transform are
A)duality property
B)time shifting property
C)modulation property
D)all of the mentioned

Accepted Answer

The Fourier transform has several properties that make it a fundamental tool in signal processing and analysis, including duality, time shifting, and modulation properties, among others.

Question 11

A base-band signal can be up-converted using
A)sine wave
B)cosine wave
C)filtering
D)none of the mentioned

Accepted Answer

The answer of A base-band signal can be up-converted using
A)sine...

Question 12

A band-pass signal can be down-converted using
A)sine wave
B)cosine wave
C)time delayed wave
D)none of the mentioned

Accepted Answer

A band-pass signal can be down-converted using a cosine wave, as it effectively shifts the frequency of the signal to a lower frequency range, which is a common technique in signal processing.

Question 13

In down-conversion multiplication with cosine wave is followed by
A)low pass filter
B)high pass filter
C)bandpass filter
D)bandstop filter

Accepted Answer

In down-conversion, multiplication with a cosine wave shifts the spectrum of the signal, and a low pass filter is used to remove the higher frequency components, isolating the down-converted signal.

Question 14

Fourier transform of a signal gives the
A)frequency content
B)bandwidth
C)frequency content & bandwidth
D)none of the mentioned

Accepted Answer

The Fourier transform of a signal provides both the frequency content and the bandwidth of the signal, as it transforms the signal from the time domain to the frequency domain, showing how different frequency components are present in the signal.

Question 15

Random things in a communication system are
A)timing offset
B)device frequency
C)attenuation
D)all of the mentioned

Accepted Answer

All of the mentioned options, timing offset, device frequency, and attenuation, are considered random factors in a communication system because they can vary unpredictably due to various external and internal influences.

Question 16

Which can be used for periodic and non periodic?
A)fourier series
B)fourier transforms
C)fourier series & transforms
D)none of the mentioned

Accepted Answer

Fourier transforms can be used for both periodic and non-periodic signals, while Fourier series is specifically for periodic signals.

Question 17

A band-pass signal has a Fourier transform equal to
A)one
B)zero
C)infinity
D)cannot be determined

Accepted Answer

A band-pass signal has a Fourier transform that is zero outside its specified frequency band.

Question 18

A band-pass signal has
A)dc component
B)no dc component
C)no side lobes
D)cannot be determined

Accepted Answer

A band-pass signal is centered around a frequency other than DC (0 Hz), meaning it does not include a DC component.

Quiz 3: Physical and Network Layer Vulnerabilities and Communication System Concepts

Which of the following is an example of physical layer vulnerability?

Which of the following is an example of data-link layer vulnerability?

Which of the following is an example of network layer vulnerability?

Which of the following is an example of physical layer vulnerability?

Which of the following is an example of data-link layer vulnerability?

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

The portion of physical layer that interfaces with the media access control sublayer is called

In the digital communication system, signals in different frequency bands are

Properties of impulse function are

Properties of Fourier transform are

A base-band signal can be up-converted using

A band-pass signal can be down-converted using

In down-conversion multiplication with cosine wave is followed by

Fourier transform of a signal gives the

Random things in a communication system are

Which can be used for periodic and non periodic?

A band-pass signal has a Fourier transform equal to

A band-pass signal has