Question 1 (1 point) d A link layer address is sometimes called a 1) link addres

Question

Question 1 (1 point) d A link layer address is sometimes called a 1) link address 2) physical address 3) MAC address 4) All of the above Save Question 2 (1 point) E A packet at the data link layer is called a 1) frame 2) packet 3) cell 4) payload Save Question 3 (1 point) techniques are used to correct data or reproduce the packet immediately acket. of waiting for a retransmission of a p 1) FEC 2) Checksum 3) CRC 4) Cluster coding instead Save Question 4 (1 point) contain the dataword plus r redundant bits. 1) datawords 2) codewords 3) messagewords 4) words

Explanation / Answer

Answer 1.

4) All of the above.

In data link layer frames are being generated. In this layer we give physical addresses. These physical addresses are called physical address, MAC address and sometimes link addresses also.

Answer 2.

1.) Frame

A packet at the data link layer is called the frame.

Answer 3.

1) FEC

Forward Error Correction technique is used for correcting errors in data transmission. In this technique we introduce redundant bits to messages called error correcting codes. This techinique corrects errors without needing of any retransmission of the packets.

All other techinques given CRC, checksum are used in error detection.

Answer 4.

2. Codewords

In block coding the messages are being divided into blocks of say k bits which are called datawords. In these datawords we add r redundant bits. Then these total n=k+r bits are called codewords.

Thus in other words these codewords contain dataword plus r redundant bits.

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