Q$2.$ a$)$ Define WPA in wireless security and explain its main purpose in $802\mathrm{.}11$ security

b$)$ What are the primary services provided by the IEEE $802\mathrm{.}11$ MAC layer?

c$)$ Explain the difference between DCF and PCF in the context of IEEE $802\mathrm{.}11$

d$)$ What frequency bands are commonly used in $802\mathrm{.}11$ wireless networks?

Q$3.$ a$)$ Define Bluetooth and briefly explain its working principle.

b$)$ Enumerate the different classes of Bluetooth devices based on range.

c$)$ Briefly explain the followings in respect of Bluetooth technology.

i$)$ Bluetooth profile

ii$)$ Bluetooth Multipoint Connectivity.

iii$)$ Bluetooth file transfer

d$)$ Explain the difference between Bluetooth pairing and Bluetooth bonding