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HPE6-A88 Exam - Topic 2 Question 9 Discussion

An IT administrator attempts to join a ClearPass server to an Active Directory domain. They notice that the system clocks of the ClearPass server and the AD domain are not in sync. The ClearPass server is 10 minutes behind the AD domain. What will be the likely outcome of this attempt to join the domain?
C) The join will fail because Active Directory only allows a maximum of five minutes of clock skew.
A) The join will succeed but ClearPass will generate a warning about the clock skew.
B) The join will succeed because ClearPass automatically adjusts the clock skew during the join process.

HPE6-A88 Exam - Topic 2 Question 9 Discussion

Actual exam question for HP's HPE6-A88 exam
Question #: 9
Topic #: 2
[All HPE6-A88 Questions]

An IT administrator attempts to join a ClearPass server to an Active Directory domain. They notice that the system clocks of the ClearPass server and the AD domain are not in sync. The ClearPass server is 10 minutes behind the AD domain. What will be the likely outcome of this attempt to join the domain?

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Suggested Answer: C

Kerberos, the underlying protocol for Active Directory authentication, is extremely time-sensitive. To prevent 'replay attacks,' AD Domain Controllers strictly enforce a maximum clock skew of 5 minutes. If the ClearPass server's clock differs from the AD domain by 10 minutes, the Kerberos tickets will be considered invalid, and the domain join attempt will fail. Administrators must ensure both systems are synced to a reliable NTP source before joining.


by Charlie at Jun 20, 2026, 04:40 AM

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Junita
2 days ago
Wait, does ClearPass really adjust the clock? Sounds odd.
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Dorian
7 days ago
I think A could be possible too, warnings happen.
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Maryann
12 days ago
C is correct, AD is strict about time sync.
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Elli
17 days ago
I think the maximum allowed clock skew is five minutes, so if ClearPass is ten minutes behind, the join will definitely fail.
upvoted 0 times
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Alex
22 days ago
I feel like I’ve seen something about ClearPass adjusting the clock during the join, but I can’t recall if that’s actually true.
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Filiberto
28 days ago
I’m not entirely sure, but I think there was a practice question that mentioned a warning could be generated if the clocks were off.
upvoted 0 times
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Celestina
1 month ago
I remember reading that Active Directory has strict requirements about time synchronization, so I think the join will fail due to the clock skew.
upvoted 0 times
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