To gain console access to a Cisco switch, two types of ports on a laptop can be used: DB-9 and USB. The DB-9 port is a traditional serial port that is often used with a DB-9 to RJ-45 console cable to connect to the switch's console port1. However, as modern laptops may not have a DB-9 port, a USB to Serial adapter can be used instead, which creates a virtual COM port that can be used to connect to the switch1. The USB port can also be used directly if the switch has a USB console port, which is common on newer Cisco devices. These ports allow for direct physical connection to the switch for configuration and management purposes. Reference := Access the CLI via PuTTY using a Console Connection on 300 and 500 Series Managed Switches - Cisco, How to connect Switch with console port - Cisco Learning Network