Which of the following BEST describes the difference between Wide SCSI and Fast SCSI?
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.