This set of Data communication and Networking Multiple Choice Questions and Answers (MCQs) focuses on “Data Link Layer – Data Link Control – Line Discipline”.
1. _______ is a function of the data link layer.
- Line discipline
- Flow control
- Error control
- All of the above
2. Line discipline is mainly a function of the _______ layer.
- physical
- data link
- network
- transport
3. _______ determines which device can send
- Line discipline
- Flow control
- Error control
- All of the above
4. _______ determines when a device can send.
- Line discipline
- Flow control
- Error control
- All of the above
5. Which data link layer function answers the question: Who should send now?
- line discipline
- flow control
- error control
- session management
6. ENQ/ACK is a _______ technique
- line discipline
- flow control
- error control
- session management
7. Poll/select is a _______ technique.
- line discipline
- flow control
- error control
- session management
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
9. Who initiates a session on an ENQ/ACK system?
- either station
- the primary
- the secondary
- none of the above
10. A station on an ENQ/ACK system sends _______ frame to initiate transmission.
- an ENQ
- an ACK
- a NAK
- an EOT
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
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
13. Transmission of data from a primary to a secondary first requires the primary to _______ the secondary
- poll
- select
- inquire
- acknowledge
14. When a primary has data to send to a secondary, it sends a _______ frame to the secondary.
- poll
- select
- inquire
- acknowledge
15. When a primary wants to receive data from a secondary, it sends a _______ frame to the secondary
- poll
- select
- inquire
- acknowledge
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
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
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
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