CN-Unit II -Quiz

The data link layer takes the packets from _________ and encapsulates them into frames for transmission.

• network layer

• physical layer

• transport layer

• application layer

Which of the following tasks is not done by data link layer?

• framing

• error control

• flow control

• channel coding

Which sublayer of the data link layer performs data link functions that depend upon the type of medium?

• logical link control sublayer

• media access control sublayer

• network interface control sublayer

• error control sublayer

Header of a frame generally contains ______________

• synchronization bytes

• addresses

• frame identifier

• all of the mentioned

Which of the following is the multiple access protocol for channel access control?

• CSMA/CD

• CSMA/CA

• Both CSMA/CD & CSMA/CA

• HDLC

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

• Link

• Command

• Response

• None of the above

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

• only when no error occurs at the transmission level

• when retransmission of old packet in a novel frame is necessary

• only when station B receives frame with errors

• all of the above

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

• U-frames

• I-frames

• S-frames

• All of the above

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'?

• Receive ready

• Receive not ready

• Reject

• Selective Reject

Which scheme/ strategy is suitable to establish the communication between the access point (AP) and the infrastructure of LANs?

• Wired

• Wireless

• Both a & b

• Cannot Predict