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The general rule of thumb is if your community page is available externally opposed to internal environments. Jive-x environments can be viewed by the public without logging in, the Jive Community is an example of a Jive-x site. Jive-n Environments are generally your company intranet, where as you can not view the page until you log in.
I can confirm that the Vitamin Shoppe environment is Jive-n
Hope this helps.