2 Suppose we are using CRC. the packet has d bits, and the generator has r bits. a. How big is the entire packet? b. How many bits will the CRC have? c. Which errors can be detected by the CRC? d. What is the checking procedure at the receiver?

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D+r

r+1=G

detect accidental changes to raw data (out of order etc)

The sending system calculates the check or verification code and appends it to the outgoing message. On the receiving end, the data is put through the same process. If the CRC produced at the receiving end does not match the sent CRC, then the data is possibly corrupt. The receiver can request that the data be retransmitted or simply ignore the data. When the CRC matches the received version, the user can be fairly confident that the transmission is not corrupted.