Computer Networking
In Cisco's Unified Wireless Solution, what is the split-MAC architecture?

The split-MAC architecture uses MAC addresses to create a forward/filter table and break up broadcast domains.
The split-MAC architecture uses MAC addresses to create a forward/filter table and break up collision domains.
The split-MAC architecture uses MAC addresses on the wireless network and IP addresses on the wired network.
The split-MAC architecture allows the splitting of 802.11 protocol packets between the AP and the controller to allow processing by both devices.

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Computer Networking
The physical layer, in reference to the OSI model, defines

All of these
the interface between the X.25 network and packet mode device
the virtual circuit interface to packet-switched service
None of these
data link procedures that provide for the exchange of data via frames that can be sent and received

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