Understanding the Administrative Mode of the Authenticator Port

Junos OS supports the supplicant mode “single” and not the “single secure” nor “multiple” modes. The “Single” mode option authenticates only the first client that connects to a port. All other clients that connect later (802.1x compliant or noncompliant) are allowed free access on that port without any further authentication. If the first authenticated client logs out, all other users are locked out until a client authenticates again.