Which command is used to checking whether two switches are connected are not?

To check whether two switches are connected, you can use the ping command from the command line interface (CLI) of a device connected to one of the switches. By pinging the IP address of the other switch, you can determine if there is connectivity between them. If the ping is successful, the switches are connected; if it fails, there may be a connectivity issue. Additionally, using commands like show cdp neighbors (for Cisco devices) can provide information about directly connected devices.