Question 1

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)Header
B)Trailer
C)Flag
D)None of the above

Accepted Answer

Bit stuffing is used to avoid confusion between the actual data and control information, such as the flag sequence that marks the beginning or end of a frame. By inserting an extra 0 in sequences of data that resemble the flag pattern, it ensures that the flag sequence remains unique and recognizable.

Question 2

_______ 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 above

Accepted Answer

Flow control is a set of procedures used to restrict the amount of data that the sender can send before waiting for acknowledgment, ensuring that the sender does not overwhelm the receiver with too much data at once.

Question 3

______ control refers to methods of error detection and correction.
A)Flow
B)Error
C)Transmission
D)None of the above

Accepted Answer

Error control specifically refers to the techniques used for detecting and correcting errors that occur in the transmission of data over a communication channel.

Question 4

In a linear block code, the _______ of any two valid codewords creates another valid codeword
A)XORing
B)ORing
C)ANDing
D)none of the above

Accepted Answer

Linear block codes have the property that the XOR (exclusive OR) of any two valid codewords results in another valid codeword. This property is fundamental to their linear structure.

Question 5

A simple parity-check code can detect __________ errors.
A)an even-number of
B)two
C)no errors
D)an odd-number of

Accepted Answer

A simple parity-check code is designed to detect an odd number of errors. It cannot reliably detect an even number of errors because such errors can cancel each other out, making the data appear as if it were correct.

Quiz 3: Data Link Layer and Error Control Protocols

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 ________.

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

______ control refers to methods of error detection and correction.

In a linear block code, the _______ of any two valid codewords creates another valid codeword

A simple parity-check code can detect __________ errors.