Comptia A+ 220-602 IT Technician

Operating Systems

Which of the following can connect up to 127 peripheral devices while still
maintaining a high data transfer rate?

A. Parallel Port.
B. Serial Port.
C. FireWire
D. USB.

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Answer: D

Explanation:
Universal Serial Bus (USB) ports are used for connecting multiple peripherals (up to
127) to one computer via a single port and the use of multi-port peripheral "hubs". USB
supports data transfer rates as high as 1.5MBps.
Incorrect answers:
A: A parallel port cannot support 127 peripheral devices while maintaining a high
transfer rate.
B: A serial port cannot support 127 peripheral devices while maintaining a high transfer
rate.
C: FireWire is not designed to support 127 peripheral devices while maintaining a high
transfer rate.
Reference:
David Groth and Dan Newland, A+ Complete Study Guide (2nd Edition), Sybex,
Alameda, CA, 2001, p. 96.