In an attempt to secure his wireless network, Bob implements a VPN to cover the wireless communications he is using in his office. Soon after the implementation, users begin complaining about the wireless network slowing down. 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.

What do you think is the reason behind this?

A.
VPNs use larger packets than wireless networks normally do

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

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

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

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