McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Master of Computer Applications (MCA) .
Chapters
| 1. |
In sliding window, if the window size is 63, what is the range of sequence numbers? |
| A. | 0 to 63 |
| B. | 0 to 64 |
| C. | 1 to 63 |
| D. | 1 to 64 |
| Answer» A. 0 to 63 | |
| 2. |
Regulation of the rate of transmission of data frames is known as |
| A. | Line discipline |
| B. | Data rate control |
| C. | Flow control |
| D. | Switch control |
| Answer» B. Data rate control | |
| 3. |
When a primary device wants to send data to a secondary device, it needs to first send _______ frame. |
| A. | ACK |
| B. | Poll |
| C. | SEL |
| D. | ENQ |
| Answer» D. ENQ | |
| 4. |
Flow control is needed to prevent |
| A. | Bit errors |
| B. | Overflow of sender buffer |
| C. | Overflow of receiver buffer |
| D. | Collision |
| Answer» C. Overflow of receiver buffer | |
| 5. |
A timer is set when _____________is sent. |
| A. | Packet |
| B. | ACK |
| C. | NAK |
| D. | All |
| Answer» A. Packet | |
| 6. |
In a Go-Back-N ARQ, if the window size is 63, what is the range of sequence numbers? |
| A. | 0 to 63 |
| B. | 0 to 64 |
| C. | 1 to 63 |
| D. | 1 to 64 |
| Answer» A. 0 to 63 | |
| 7. |
In Go-Back-N ARQ, if frames 4, 5, and 6 are received successfully, the receiver may send an ACK _______ to the sender. |
| A. | 5 |
| B. | 6 |
| C. | 7 |
| D. | any of the above |
| Answer» C. 7 | |
| 8. |
ARQ stands for _______. |
| A. | Automatic repeat quantization |
| B. | Automatic repeat request |
| C. | Automatic retransmission request |
| D. | Acknowledge repeat request |
| Answer» B. Automatic repeat request | |
| 9. |
For Stop-and-Wait ARQ, for 10 data packets sent, _______ acknowledgments are needed. |
| A. | exactly 10 |
| B. | less than 10 |
| C. | more than 10 |
| D. | none of the above |
| Answer» A. exactly 10 | |
| 10. |
HDLC is an acronym for _______. |
| A. | High-duplex line communication |
| B. | High-level data link control |
| C. | Half-duplex digital link combination |
| D. | Host double-level circuit |
| Answer» B. High-level data link control | |
| 11. |
Data link control deals with the design and procedures for ______ communication. |
| A. | node-to-node |
| B. | host-to-host |
| C. | process-to-process |
| D. | none of the above |
| Answer» A. node-to-node | |
| 12. |
_______ in the data link layer separates a message from one source to a destination, or from other messages going from other sources to other destinations. |
| A. | Digitizing |
| B. | Controlling |
| C. | Framing |
| D. | none of the above |
| Answer» C. Framing | |
| 13. |
In _______ framing, there is no need for defining the boundaries of frames. |
| A. | fixed-size |
| B. | variable-size |
| C. | standard |
| D. | none of the above |
| Answer» A. fixed-size | |
| 14. |
In ________ framing, we need a delimiter (flag) to define the boundary of two frames. |
| A. | fixed-size |
| B. | variable-size |
| C. | standard |
| D. | none of the above |
| Answer» B. variable-size | |
| 15. |
_________framing uses two categories of protocols: character-oriented and bit-oriented. |
| A. | Fixed-size |
| B. | Variable-size |
| C. | Standard |
| D. | None of the above |
| Answer» B. Variable-size | |
| 16. |
In a ________ protocol, the data section of a frame is a sequence of characters. |
| A. | bit-oriented |
| B. | character-oriented |
| C. | either (a) or (b) |
| D. | none of the above |
| Answer» B. character-oriented | |
| 17. |
In a _________ protocol, the data section of a frame is a sequence of bits. |
| A. | byte-oriented |
| B. | bit-oriented |
| C. | either (a) or (b) |
| D. | none of the above |
| Answer» B. bit-oriented | |
| 18. |
In _________ protocols, we use ________. |
| A. | character-oriented; byte stuffing |
| B. | character-oriented; bit stuffing |
| C. | bit-oriented; character stuffing |
| D. | none of the above |
| Answer» A. character-oriented; byte stuffing | |
| 19. |
Byte stuffing means adding a special byte to the data section of the frame when there is a character with the same pattern as the ______. |
| A. | header |
| B. | trailer |
| C. | flag |
| D. | none of the above |
| Answer» C. flag | |
| 20. |
In ________ protocols, we use ________. |
| A. | byte-oriented; bit stuffing |
| B. | character-oriented; bit stuffing |
| C. | bit-oriented; bit stuffing |
| D. | none of the above |
| Answer» C. bit-oriented; bit stuffing | |
| 21. |
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 |
| Answer» C. Flag | |
| 22. |
_______ 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 |
| Answer» A. Flow | |
| 23. |
______ control refers to methods of error detection and correction. |
| A. | Flow |
| B. | Error |
| C. | Transmission |
| D. | None of the above |
| Answer» B. Error | |
| 24. |
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 |
| Answer» A. XORing | |
| 25. |
A simple parity-check code can detect __________ errors. |
| A. | an even-number of |
| B. | two |
| C. | no errors |
| D. | an odd-number of |
| Answer» D. an odd-number of | |
| 26. |
_______codes are special linear block codes with one extra property. If a codeword is rotated, the result is another codeword. |
| A. | Non-linear |
| B. | Convolution |
| C. | Cyclic |
| D. | none of the above |
| Answer» C. Cyclic | |
| 27. |
The _____of errors is more difficult than the ______. |
| A. | correction; detection |
| B. | detection; correction |
| C. | creation; correction |
| D. | creation; detection |
| Answer» A. correction; detection | |
| 28. |
In modulo-11 arithmetic, we use only the integers in the range ______, inclusive. |
| A. | 1 to 10 |
| B. | 1 to 11 |
| C. | 0 to 10 |
| D. | none of the above |
| Answer» C. 0 to 10 | |
| 29. |
In modulo-2 arithmetic, we use only ______. |
| A. | 1 and 2 |
| B. | 0 and 2 |
| C. | 0 and 1 |
| D. | none of the above |
| Answer» C. 0 and 1 | |
| 30. |
Adding 1 and 1 in modulo-2 arithmetic results in _________. |
| A. | 1 |
| B. | 2 |
| C. | 0 |
| D. | none of the above |
| Answer» C. 0 | |
| 31. |
Which one of the following task is not done by data link layer? |
| A. | framing |
| B. | error control |
| C. | flow control |
| D. | channel coding |
| Answer» D. channel coding | |
| 32. |
Which sublayer of the data link layer performs data link functions that depend upon the type of medium? |
| A. | logical link control sublayer |
| B. | media access control sublayer |
| C. | network interface control sublayer |
| D. | none of the above |
| Answer» B. media access control sublayer | |
| 33. |
Header of a frame generally contains |
| A. | synchronization bytes |
| B. | addresses |
| C. | frame identifier |
| D. | all of the above |
| Answer» D. all of the above | |
| 34. |
When 2 or more bits in a data unit has been changed during the transmission, the error is called |
| A. | random error |
| B. | burst error |
| C. | inverted error |
| D. | none |
| Answer» B. burst error | |
| 35. |
CRC stands for |
| A. | cyclic redundancy check |
| B. | code repeat check |
| C. | code redundancy check |
| D. | cyclic repeat check |
| Answer» A. cyclic redundancy check | |
| 36. |
Which one of the following is a data link protocol? |
| A. | Ethernet |
| B. | point to point protocol |
| C. | HDLC |
| D. | all of the above |
| Answer» D. all of the above | |
| 37. |
The technique of temporarily delaying outgoing acknowledgements so that they can be hooked onto the next outgoing data frame is called |
| A. | piggybacking |
| B. | cyclic redundancy check |
| C. | fletcher’s checksum |
| D. | none of the mentioned |
| Answer» A. piggybacking | |
| 38. |
The data link layer takes the packets from _____ and encapsulates them into frames for transmission. |
| A. | network layer |
| B. | physical layer |
| C. | transport layer |
| D. | application layer |
| Answer» A. network layer | |
| 39. |
The maximum size of payload field in Ethernet frame is |
| A. | 1000 bytes |
| B. | 1200 bytes |
| C. | 1300 bytes |
| D. | 1500 bytes |
| Answer» D. 1500 bytes | |
| 40. |
What is inter-frame gap? |
| A. | idle time between frames |
| B. | idle time between frame bits |
| C. | idle time between packets |
| D. | none of the above |
| Answer» A. idle time between frames | |
| 41. |
Error detection at the data link level is achieved by |
| A. | Bit Stuffing |
| B. | Cyclic Redundancy Code |
| C. | Hamming Code |
| D. | Equalization |
| Answer» B. Cyclic Redundancy Code | |
| 42. |
"BAUD" rate means |
| A. | The number of bits transmitted per unit time. |
| B. | The number of bytes transmitted per unit time. |
| C. | The rate at which the signal changes. |
| D. | None of the above |
| Answer» C. The rate at which the signal changes. | |
| 43. |
Start and stop bits are used in serial communication for |
| A. | Error detection |
| B. | Error correction |
| C. | Synchronization |
| D. | Slowing down the communication |
| Answer» C. Synchronization | |
| 44. |
Unmodulated signal coming from a transmitter is know as |
| A. | Carrier signal |
| B. | Baseband signal |
| C. | Primary signal |
| D. | None of these |
| Answer» B. Baseband signal | |
| 45. |
Maximum data rate of a channel for a noiseless 3-kHz binary channel is |
| A. | 3000bps |
| B. | 6000 bps |
| C. | 1500 bps |
| D. | None of these |
| Answer» B. 6000 bps | |
| 46. |
The ________ measures the number of lost or garbled messages as a fraction of the total sent in the sampling period. |
| A. | Residual Error Rate. |
| B. | Transfer Failure Probability. |
| C. | Connection release failure probability. |
| D. | Connection establish. |
| Answer» A. Residual Error Rate. | |
| 47. |
In session layer, during data transfer, the data stream responsible for the "control" purpose (i.e control of the session layer itself) is |
| A. | Regular Data |
| B. | Typed data |
| C. | Capability Data |
| D. | Expedited Data |
| Answer» C. Capability Data | |
| 48. |
Which of the following is not a field in the Ethernet Message packet? |
| A. | Type |
| B. | Data |
| C. | Pin-code |
| D. | Address |
| Answer» C. Pin-code | |
| 49. |
The Network topology that supports bi-directional links between each possible node is |
| A. | Ring |
| B. | Star |
| C. | Tree |
| D. | Mesh |
| Answer» D. Mesh | |
| 50. |
Which network has connectivity range up to 10 meters? |
| A. | LAN |
| B. | PAN |
| C. | MAN |
| D. | WAN |
| Answer» B. PAN | |
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