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
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.