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Granting access to a system based on a factor such as an individual’s retina during a scan is an example of what type of authentication method?

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The CEH exam is a 125-question multiple-choice exam. Candidates have four hours to complete the CEH exam.
Common CEH exam topics covered include: hacking methodologies, scanning methodologies, port scan types, and expected return responses. 
Knowing how to work with tools such as Nmap, Wireshark, Snort, OpenSSL, Netstat, and Hping will be handy.


Granting access to a system based on a factor such as an individual’s retina during a scan is an example of what type of authentication method?






 
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