Section - Security
9. Next to EAP User Certificate, click Browse to locate the user certificate file. It is optional for EAP-TLS, but mandatory
for PEAP and EAP-TTLS.
10. Next to EAP Root Certificate, click Browse to locate the Root Certificate file. It is mandatory to upload a root certificate
to be able to authenticate the server certificate.
D-Link DAP-1555 User Manual