Data Link Layer - MCQs with Answer

Data Link Layer - MCQs with Answer

1. Which among the following represents the objectives/requirements of Data Link Layer?

a. Frame Synchronization
b. Error & Flow Control
c. Both a & b
d. None of the above

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2. When does the station B send a positive acknowledgement (ACK) to station A in Stop and Wait protocol?

a. only when no error occurs at the transmission level
b. when retransmission of old packet in a novel frame is necessary
c. only when station B receives frame with errors
d. all of the above

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3. Which provision can resolve / overcome the shortcomings associated with duplication or failure condition of Stop and Wait Automatic Repeat Request protocol especially due to loss of data frames or non-reception of acknowledgement?

a. Provision of sequence number in the header of message
b. Provision of checksum computation
c. Both a & b
d. None of the above

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4. Which consequences are more likely to occur during the frame transmission in Stop-and-Wait ARQ mechanism?

a. Loss of frame or an acknowledgement
b. Delay in an acknowledgement
c. Normal operation
d. All of the above

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5. Which feature of Go-Back-N ARQ mechanism possesses an ability to assign the sliding window in the forward diretion?

a. Control Variables
b. Sender Sliding Window
c. Receiver Sliding Window
d. Resending of frames

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6. Which ARQ mechanism deals with the transmission of only damaged or lost frames despite the other multiple frames by increasing the efficiency & its utility in noisy channels?

a. Go-Back-N ARQ
b. Selective Repeat ARQ
c. Stop-and-Wait ARQ
d. All of the above

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7. What are the frames issued by the secondary station of HDLC ,known as?

a. Link
b. Command
c. Response
d. None of the above

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8. Which operational mode/s of HDLC support/s the balanced configuration by governing point-to-point link connectivity in addition to the primary as well as secondary functions performed by the station?

a. NRM
b. ABM
c. Both a & b
d. None of the above

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9. Which category of HDLC frames undergoes error and flow control mechanisms by comprising send and receive sequence numbers?

a. U-frames
b. I-frames
c. S-frames
d. All of the above

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10. Which type of S-frame in HDLC exhibit the correspondence of last three bits [N(R)] by defining the negative acknowledgement (NAK) number with the code value of '01'?

a. Receive ready
b. Receive not ready
c. Reject
d. Selective Reject

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