In an attempt to secure his wireless network, Bob implements a VPN to cover the wireless communications. Immediately after the implementation, users begin complaining about how slow the wireless network is. After benchmarking the network’s speed. Bob discovers that throughput has dropped by almost half even though the number of users has remained the same.

Why does this happen in the VPN over wireless implementation?

A.
The stronger encryption used by the VPN slows down the network.

B.
Using a VPN with wireless doubles the overhead on an access point for all direct client to access point communications.

C.
VPNs use larger packets then wireless networks normally do.

D.
Using a VPN on wireless automatically enables WEP, which causes additional overhead.

Explanation:
By applying VPN the access point will have to recalculate all headers destined for client and from clients twice.