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What allows you to authenticate once to an application without having to authenticate again to access multiple website or applications?
TACACS+
RADIUS
SAML
Kerberos
Oauth
SSO
Single sign on is the answer. SAML is a framework for exchange security information (see reference http://saml.xml.org/). While Kerberos could be argued that it is a true SSO solution the better answer for this question is SSO.
Correction: SSO is not a service but a concept, this question should be re-worded or the change the answer to Kerberos which would be the service to implement SSO. -JK - Removed duplicate answers 6/7/17
Fix this question or remove Kerberos from the answers.
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