Which of the following BEST describes the difference between Wide SCSI and Fast SCSI?
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A.
Wide SCSI can transfer data at up to 10 MBps while Fast SCSI can transfer data at up to 20 MBps.
B.
Wide SCSI has a bus width of 16 bits while Fast SCSI has a bus width of 8 bits.
C.
Wide SCSI has a maximum cable length of 10 feet (3 meters) while Fast SCSI has a maximum cable length of 20 feet (6 meters).
D.
Wide SCSI has a bus speed of 20 MHz while Fast SCSI has a bus speed of 40 MHz.
Explanation:
Wide SCSI, which is also referred to as SCSI-2, has a data bus width of 16 bits (2 byte), has a maximum cable length of 20 feet (6 meters), supports up to sixteen devices, has a bus speed of 5 MHz, and a maximum transmission speed of 10 MBps (2 bytes 5 MHz = 10 MBps). Fast SCSI has a data bus width of 8 bits (1 byte), has a maximum cable length of 10 feet (3 meters), supports up to eight devices, has a bus speed of 10 MHz, and a maximum transmission speed of 10 MBps (1 byte 10 MHz = 10 MBps).
Incorrect
Answers:
A: Both Wide SCSI and Fast SCSI have a maximum transmission speed of 10 MBps.
C: Wide SCSI has a maximum cable length of 20 feet (6 meters) while Fast SCSI has a maximum cable length of 10 feet (3 meters).
D: Wide SCSI has a bus speed of 5 MHz, not 20 MHz, while Fast SCSI has a bus speed of 10 MHz, not 40 MHz.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 143-147.