Question 1

Which are orthonormal signal representation?
A)sine and cosine at same frequency
B)wavelets
C)complex sinusoids at a different frequency
D)all of the mentioned

Accepted Answer

Orthonormal signal representations mean that the signals are both orthogonal (their inner product is zero) and normalized (their magnitude is one). Sine and cosine at the same frequency, wavelets, and complex sinusoids at different frequencies all satisfy these conditions, making them orthonormal representations.

Question 2

Constellation diagram is plotted in
A)constellation space
B)signal space
C)orthogonal space
D)boundary space

Accepted Answer

A constellation diagram is plotted in signal space, which represents the modulation symbols in a two-dimensional plane, with each axis typically representing a component of the modulation (e.g., in-phase and quadrature components in QAM).

Question 3

Cumulative distributive function is
A)non negative
B)non decreasing
C)non negative & decreasing
D)none of the mentioned

Accepted Answer

C

Question 4

Which are non negative functions?
A)pdf
B)pmf
C)pdf & pmf
D)none of the mentioned

Accepted Answer

Both probability density functions (pdf) and probability mass functions (pmf) are non-negative. This is because they represent probabilities, which cannot be negative.

Question 5

Automatic repeat request error management mechanism is provided by
A)logical link control sublayer
B)media access control sublayer
C)network interface control sublayer
D)application access control sublayer

Accepted Answer

The Logical Link Control (LLC) sublayer, part of the data link layer in the OSI model, provides error management mechanisms such as Automatic Repeat Request (ARQ) to ensure data is reliably transmitted over the physical medium.

Question 6

What is start frame delimeter (SFD) in ethernet frame?
A)10101010
B)10101011
C)00000000
D)11111111

Accepted Answer

The Start Frame Delimiter (SFD) in an Ethernet frame is a sequence of bits that signals the beginning of the frame data. The SFD follows the preamble, which is a sequence of alternating 1s and 0s used for synchronization. The SFD is specifically 10101011, which helps the receiving system recognize the start of the actual Ethernet frame following the preamble.

Quiz 4: Networking and Data Link Layer

Which are orthonormal signal representation?

Constellation diagram is plotted in

Cumulative distributive function is

Which are non negative functions?

Automatic repeat request error management mechanism is provided by

What is start frame delimeter (SFD) in ethernet frame?