220-801 Question #859: Real Exam Question with Answer & Explanation

The correct answer is C: DB-9 connector. Serial I/O ports (COM ports) on PCs use a DB-9 (9-pin D-subminiature) connector, also called a DE-9. These ports transmit data one bit at a time sequentially. The DB-15 (B) is associated with VGA video ports and game/MIDI ports. RJ-11 (A) is a telephone jack, and RJ-45 (D) is an

Question

Which of the following is a characteristic of a serial I/O port?

Options

ARJ-11 connector
BDB-15 connector
CDB-9 connector
DRJ-45 connector

Explanation

Serial I/O ports (COM ports) on PCs use a DB-9 (9-pin D-subminiature) connector, also called a DE-9. These ports transmit data one bit at a time sequentially. The DB-15 (B) is associated with VGA video ports and game/MIDI ports. RJ-11 (A) is a telephone jack, and RJ-45 (D) is an Ethernet network connector - neither of these is a serial I/O port. Recognizing DB-9 as the serial port connector is a fundamental A+ hardware identification skill.

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