All SONiC devices support both the serial console-based login and the SSH based login by default. 

The default credential (if not modified at image build time) for login is admin/YourPaSsWoRd.

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In case of SSH login, users can login to the management interface (eth0) IP address after configuring the same using serial console. 

By default, login takes the user to the default prompt from which all the show commands can be executed.