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doubt in HFSJ mock exam question

 
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On page 832 from Head First Servlet & JSP:

Of the various types of authentication guaranteed by a Java EE container, only BASIC, Digest, and Form Based are implemented by matching a user name to a password.
correct answer: FALSE

But I think that the answer is TRUE : Client cert auhentication is not based on user+password.
Am I wrong ?
 
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I think the answer is false because DIGEST is not required to be implemented by containers, and the question is about "authentication guaranteed by a Java EE container...".
 
Antonio Tercero
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Thank you Christophe.
I didn't pay attention to ..authentication guaranteed ..
 
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