The data transmission of the PCI bus is being discussed. Technician A says the Header detects if the message has been corrupted or if there are any other errors. Technician B says the cyclic redundancy check (CRC) is one to three bytes of information concerning the type, length, priority, target module, and sending module. Who is correct?
A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question

Quizplus · Accepted Answer

Technician A is incorrect because the Header does not detect errors; it typically contains information about the type of packet, its length, and other control information. Error detection, such as identifying corrupted messages, is usually performed by mechanisms like a Cyclic Redundancy Check (CRC) but not by the header itself. Technician B is incorrect because the CRC is not used to convey information about the type, length, priority, target module, and sending module. Instead, CRC is a form of checksum used solely for error-checking purposes to detect accidental changes to raw data. Information about the packet, such as type, length, priority, etc., is contained in the header or other specific fields of the data packet, not in the CRC.

The Data Transmission of the PCI Bus Is Being Discussed