a. Why is checksum an important entity in transmission of Ethernet frames? Briefly state the term Cyclic Redundancy Checksum (CRC) and its uses. [3 Marks] b. Calculate the CRC for the X binary data shown in Figure 2, when the divisor is 10001. (Y)2 = (200 + X)10 X = Last two digits of your MIT ID (i.e. if your ID is MIT123456, then X=56) [8 Marks] c. Compile a frame that would be sent after appending the checksum to the original data, furthermore, how would you prove that the frame received is error free?