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Which of the following protocols was MOST likely used o…

An administrator notices an unused cable behind a cabinet that is terminated with a DB-9 connector. Which of the following protocols was MOST likely used on this
cable?

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A.
RS-232

B.
802.3

C.
ATM

D.
Token ring

Explanation:
A DB-9 connector is used on serial cables. Serial cables use the RS-232 protocol which defines the functions of the 9 pins in a DB-9 connector. The RS-232
standard was around long before computers. It’s rare to see a new computer nowadays with a serial port but they were commonly used for connecting external
analog modems, keyboards and mice to computers.

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