A network architect is planning an HP Unified Wired-WLAN solution for an office. The wireless
network must support:
4000 concurrent users
—
Moderately heavy usage
Seamless roaming
IEEE 802.11ac APs
What is one reason for using two HP 10500/7500 20G Unified Wired-WLAN modules as the
controllers for this solution?
A.
The customer needs fast roaming, which requires a mobility solution between two Unified
Wired-WLAN modules
B.
One module is required for traffic processing, and the other is required for key caching to
enable roaming
C.
One module is required to control the APs, and the other is required for traffic processing
D.
The Unified Wired-WLAN modules can be licensed and configured to provide redundancy for
each other
Explanation:
http://h17007.www1.hp.com/us/en/networking/products/mobility/HP_870_Unified_WiredWLAN_Switch_Series/
According to the study-guide, fast roaming can be setup with only 1 Unified Wired-WLAN module. Fast roaming means roaming between Access Points within the same Access Controller (AC). The act of fast roaming between 2 Wired-WLAN controllers is called inter-AC fast roaming.
But, just like Answer A says, you need a mobility solution. This would be inter-AC tunneling Protocol (IACTP). But, 2 wired-WLAN controllers are not required for fast roaming in-and-of-themselves.
So, this eliminates all answers except D.
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