WorksheetsKK-Quick-2-2
Total questions: 15
Worksheet time: 8mins
What does the Cyclic Redundancy Check (CRC) detect?
(i) Single-bit errors
(ii) Burst errors
(iii) Syntax errors
(iv) Acknowledgment errors
(i) only
(i), and (ii)
(i), (ii) and (iii)
All the above
Which error detection method uses polynomial division?
Parity bit
Hamming code
CRC
Checksum
In a two-dimensional parity check, what kind of error can be detected?
Single-bit errors
Double-bit errors
Some burst errors
All of the above
Which of the following is not true about CRC?
It is less accurate than parity
It uses modulo-2 division
It can detect burst errors
It uses a generator polynomial
In Forward Error Correction, __________ is a technique used to spread bits from a data block across multiple transmitted chunks to protect against burst errors.
Bit stuffing
Chunk interleaving
Packet switching
Checksum computation
What is the main advantage of Go-Back-N over Stop-and-Wait?
More accurate error detection
Simpler protocol
Increased bandwidth efficiency
No need for acknowledgments
In Go-Back-N ARQ, when a frame is lost or corrupted...
(i) Only the lost frame is resent.
(ii) Sender retransmits the first lost frame and all after it.
(iii) Receiver buffers the next frames.
(iv)Receiver discards the first lost frame and following frames.
(i) and (iv)
(ii) and (iv)
(i) and (iii)
All the above
Which HDLC frame type is used for data transmission?
Information (I-frame)
Supervisory (S-frame)
Unnumbered (U-frame)
Acknowledgment (A-frame)
What is the flag field used in HDLC?
To indicate error in frames
To mark the beginning and end of a frame
To specify source and destination addresses
To set window size
What is the bit pattern of an HDLC flag?
11111111
10101010
10000001
01111110
The main difference between slotted ALOHA and pure ALOHA is:
Use of time slots in slotted ALOHA
Higher collision probability in slotted ALOHA
Lower throughput in slotted ALOHA
No difference
In CSMA/CD, what happens after a collision is detected?
The station stops and waits for an acknowledgment
The station retries immediately
Nothing happens
The station sends a jamming signal and reschedules transmission
Which of the following is NOT a controlled access method?
Reservation
Aloha
Polling
Token passing
Which of the following statements is TRUE about multiple access techniques?
FDMA assigns different users unique time slots within the same frequency.
TDMA allows multiple users to transmit simultaneously using different codes.
ALOHA avoids collisions by sensing the channel before transmitting.
CDMA enables multiple users to transmit simultaneously using unique codes.
Which of the following statements is INCORRECT?
In reservation, time slots are reserved in advance before data transmission.
In token passing, collisions are common because stations compete for the token.
In polling, a central controller invites each station to transmit.
CDMA allows multiple users to transmit simultaneously using unique codes.
