COMPTIA A+ Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

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What type of connector does a Serial Port use?

USB Type-C

HDMI

Port with DB9 9-pin connector

A serial port typically uses a connector that is characterized by its DB9 9-pin configuration. The DB9 connector is a standard connector that was widely used for RS-232 serial communication, allowing for one-to-one connections for devices like modems, printers, and mouse devices. This type of connector is easily recognizable due to its distinctive D-shaped outline and the arrangement of the nine pins.

USB Type-C, HDMI, and Thunderbolt connectors serve different purposes and are designed for different types of data transmission. USB Type-C is a modern universal connector used for various devices, while HDMI is designed specifically for high-definition video and audio signals. Thunderbolt connectors enable high-speed data transfer and daisy-chaining of devices, which are not related to the functionality of a traditional serial port. Therefore, the DB9 connector specifically aligns with the historical and functional characteristics of a serial port.

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Thunderbolt

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