This set of Data communication and Networking Multiple Choice Questions and Answers (MCQs) focuses on “Data Link Layer – Data Link Control – Line Discipline”.
PRACTICE IT NOW TO SHARPEN YOUR CONCEPT AND KNOWLEDGE
1. _______ is a function of the data link layer.
- Line discipline
- Flow control
- Error control
- All of the above
D. All of the above
2. Line discipline is mainly a function of the _______ layer.
- physical
- data link
- network
- transport
B. data link
3. _______ determines which device can send
- Line discipline
- Flow control
- Error control
- All of the above
A. Line discipline
4. _______ determines when a device can send.
- Line discipline
- Flow control
- Error control
- All of the above
A. Line discipline
5. Which data link layer function answers the question: Who should send now?
- line discipline
- flow control
- error control
- session management
A. line discipline
6. ENQ/ACK is a _______ technique
- line discipline
- flow control
- error control
- session management
A. line discipline
7. Poll/select is a _______ technique.
- line discipline
- flow control
- error control
- session management
A. line discipline
8. _______ is a line discipline technique used when there is a dedicated link between the sender and the receiver
- ENQ/ACK
- Poll/select
- Stop-and-wait
- a or b
A. ENQ/ACK
9. Who initiates a session on an ENQ/ACK system?
- either station
- the primary
- the secondary
- none of the above
A. either station
10. A station on an ENQ/ACK system sends _______ frame to initiate transmission.
- an ENQ
- an ACK
- a NAK
- an EOT
A. an ENQ
11. A station on an ENQ/ACK system sends _______ frame to indicate that it is ready to receive
- an ENQ
- an ACK
- a NAK
- an EOT
B. an ACK
12. A station on an ENQ/ACK system sends _______ frame to indicate that it is not ready to receive.
- an ENQ
- an ACK
- a NAK
- an EOT
C. a NAK
13. Transmission of data from a primary to a secondary first requires the primary to _______ the secondary
- poll
- select
- inquire
- acknowledge
B. select
14. When a primary has data to send to a secondary, it sends a _______ frame to the secondary.
- poll
- select
- inquire
- acknowledge
B. select
15. When a primary wants to receive data from a secondary, it sends a _______ frame to the secondary
- poll
- select
- inquire
- acknowledge
A. poll
16. In a system using the poll/select line discipline, the address field contains the address of _______
- the recipient
- the sender
- the primary
- the secondary
D. the secondary
17. If a secondary is ready to receive data from a primary, it returns _______ frame in response to the select frame.
- a SEL
- an ACK
- a POLL
- a NAK
B. an ACK
18. If a secondary has data to send to a primary, it returns _______ frame in response to the poll frame
- a data
- a SEL
- an ACK
- an EOT
A. a data
19. If a secondary has no data to send, it returns _______ frame in response to a poll frame.
- a SEL
- an ACK
- a NAK
- an EOT
C. a NAK
