CISSP Certified Information Systems Security Professional (CISSP)
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Note 2: CISSP Answers are not shown in demo questions.
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Demo Question 17.
Which of the following is the MOST secure network access control procedure to adopt when using a callback device?
A. The user enters a userid and PIN, and the device calls back the telephone number that corresponds to the userid.
B. The user enters a userid, PIN, and telephone number, and the device calls back the telephone number entered.
C. The user enters the telephone number, and the device verifies that the number exists in its database before calling back.
D. The user enters the telephone number, and the device responds with a challenge.
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Answer: A
Explanation: Usually a request for a username and password takes place and the NAS may
hang up the call in order to call the user back at a predefined phone number. This is a
security activity that is used to try and ensure that only authenticated users are given
access to the network and it reverse the long distance charges back to the
company...However, this security measure can be compromised if someone implements call
forwarding. - Shon Harris All-in-one Certification Guide pg 463
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