I'm not sure if you mean ssh (the client) or sshd (the server).
If you run ssh with "ssh -2", you force the client to use v2 only. If it can connect to your server, then your server is also accepting v2. Likewise, if you run "ssh -1", you force the client to connect with v1 only. If you cannot connect to your server, that means your server is *Only* accepting v2, and not v1. If you can, then it means it's accepting both.
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