A. Serial interface.
Connecting via a serial interface allows technicians to access the console port of networking devices such as switches, routers, and firewalls. This connection enables them to configure and manage the device's settings directly through the console interface.
Therefore, the correct answer is:
A. Serial interface.
A serial interface is a common way to connect to the console port of a switch using a rollover cable and a terminal emulator program. This allows the network technician to configure and troubleshoot the switch. Bluetooth, near-field communication, and port replicator are not used for console connections.
Reference: CompTIA A+ Core 1 (220-1101) Certification Study Guide, page 31
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