This set of Data communication and Networking Multiple Choice Questions and Answers (MCQs) focuses on “Data link Protocols – Synchronous protocols – Bit-Oriented Protocol MCQs”.
PRACTICE IT NOW TO SHARPEN YOUR CONCEPT AND KNOWLEDGE
1. Control information in a system using _______ protocol can be just one or a multiple number of bits
- an asynchronous
- a character-oriented
- a bit-oriented
- b and c
C. a bit-oriented
2. _______ is the basis for all bit-oriented protocols in use today
- SDLC
- HDLC
- PPP
- LAP
B. HDLC
3. AN HDLC _______ station sends commands.
- primary
- secondary
- combined
- a and c
D. a and c
4. AN HDLC _______ station sends responses
- primary
- secondary
- combined
- b and c
D. b and c
5. AN HDLC _______ station sends both commands and responses
- primary
- secondary
- combined
- none of the above
C. combined
6. In a _______ configuration, an HDLC primary station and several secondary stations are connected
- an unbalanced
- a symmetrical
- a balanced
- an asymmetrical
A. an unbalanced
7. In an HDLC _______ configuration, the connected stations each consist of two logical stations (primary and secondary)
- unbalanced
- symmetrical
- balanced
- asymmetrical
B. symmetrical
8. In an HDLC _______ configuration, both stations are of the combined type.
- unbalanced
- symmetrical
- balanced
- asymmetrical
C. balanced
9. In an HDLC _______ configuration, a physical station can send both commands and responses
- unbalanced
- symmetrical
- balanced
- b and c
C. balanced
10. In HDLC, the _______ describes which station has control of the link.
- station type
- configuration
- mode of communication
- any of the above
C. mode of communication
11. In the HDLC _______, the secondary device must have permission from the primary before it can transmit.
- NRM (normal response mode)
- ARM (asynchronous response mode)
- ABM (asynchronous balanced mode)
- any of the above
A. NRM (normal response mode)
12. There are _______ types of HDLC frames.
- 1
- 2
- 3
- 4
C. 3
13. An HDLC _______ is used to transport user data and control information.
- I-frame
- S-frame
- U-frame
- A-frame
A. I-frame
14. An HDLC _______ can transport system management information.
- I-frame
- S-frame
- U-frame
- A-frame
C. U-frame
15. The HDLC flag field is _______.
- 01000010
- 01010101
- 10000001
- 01111110
D. 01111110
16. HDLC inserts a redundant 0 bit after the _______ consecutive 1 bit in the message data.
- fifth
- sixth
- seventh
- eighth
A. fifth
17. If the HDLC flag field pattern is found in the message data field, it needs to be altered through _______
- bit stuffing
- byte stuffing
- bit synchronization
- byte synchronization
A. bit stuffing
18. If the HDLC receiver counts more than six but less than fifteen consecutive 1s, this signifies _______
- data
- a flag
- an abort
- an idle channel
C. an abort
19. If the HDLC receiver counts fifteen or more consecutive 1s, this signifies _______.
- data
- a flag
- an abort
- an idle channel
D. an idle channel
20. If the HDLC receiver counts exactly six consecutive 1s, this signifies _______
- data
- a flag
- an abort
- an idle channel
B. a flag
21. If the HDLC receiver counts exactly five consecutive 1s, this signifies _______
- data
- a flag
- an abort
- an idle channel
A. data
22. When primary station A sends an HDLC frame to secondary station B, the address field contains the _______
- physical address of station A
- physical address of station B
- logical address of station A
- logical address of station B
B. physical address of station B
23. When secondary station B sends an HDLC frame to primary station A, the address field contains the _______
- physical address of station A
- physical address of station B
- logical address of station A
- logical address of station B
B. physical address of station B
24. In a five-byte HDLC address field, _______ in a 0 bit and _______ in a 1 bit
- 2 bytes end; 3 bytes end
- 3 bytes end; 2 bytes end
- 4 bytes end; 1 byte ends
- 1 byte ends; 4 bytes end
C. 4 bytes end; 1 byte ends
25. If the least significant bit of a byte in an HDLC address field is 1, this means there are _______ more address bytes
- 0
- 1
- 2
- 3
A. 0
26. If the first two bits of an HDLC control field both 1s, this signifies _______.
- an I-frame
- an S-frame
- a U-frame
- an E-frame
C. a U-frame
27. All HDLC control fields contain _______.
- N(S) bits
- N(R) bits
- a P/F bit
- code bits
C. a P/F bit
28. The HDLC _______ indicate the number of the frame being sent.
- N(S) bits
- N(R) bits
- P/F bit
- code bits
A. N(S) bits
29. The HDLC _______ for acknowledgment.
- N(S) field is
- N(R) field is
- P/F bit is
- code bits are
B. N(R) field is
30. _______ contains both N(S) and N(R) bits
- An I-frame
- An S-frame
- A U-frame
- none of the above
A. An I-frame
31. _______ contains neither N(S) nor N(R) bits.
- An I-frame
- An S-frame
- A U-frame
- none of the above
C. A U-frame
32. _______ is sent when acknowledgment is needed but there is no user data to transmit
- An I-frame
- An S-frame
- A U-frame
- none of the above
B. An S-frame
33. The HDLC control field in _______ is increased to two bytes in the extended mode
- an I-frame
- an S-frame
- a U-frame
- a and b
D. a and b
34. The HDLC P/F bit means poll when the frame is sent by a _______ station to a _______ station.
- secondary; primary
- primary; secondary
- secondary; combined
- secondary; secondary
B. primary; secondary
35. The HDLC P/F bit means final when the frame is sent by a _______ station to a _______ station
- secondary; primary
- primary; secondary
- secondary; combined
- secondary; secondary
A. secondary; primary
36. An HDLC frame uses _______ for error detection.
- checksum
- VRC
- LRC
- CRC
D. CRC
37. In an HDLC S-frame the N(R) field can contain _______.
- the number of the next frame expected
- the number of a damaged frame
- the number of address bytes
- a and b
D. a and b
38. Negative acknowledgment requires an HDLC S-frame with the code field set to _______
- 01
- 10
- 11
- a or c
A. 01
39. Polling or selecting requires an HDLC S-frame with the code field set to _______
- 00
- 01
- 10
- a or c
D. a or c
40. The HDLC U-frame has a _______ bit code field
- 2
- 3
- 4
- 5
D. 5
41. The U in U-frame stands for _______.
- unsupervised
- unilateral
- unnumbered
- unicast
C. unnumbered
42. Mode setting is handled by the _______ -frame.
- I
- S
- U
- any of the above
C. U
43. Disconnection and initialization are handled by the _______ frame.
- I
- S
- U
- any of the above
C. U
44. A secondary station has three data frames to send in response to a poll. The P/F bit for the first frame is _______, for the second frame it's _______, and for the third (last) frame it's _______
- 1; 1; 1
- 0; 0; 0
- 1; 0; 0
- 0; 0; 1
D. 0; 0; 1
