Q$1.$ a$)$ Define IEEE $802\mathrm{.}11$ standard and explain its main purpose in wireless network.

b$)$ Briefly explain the basic architecture of IEEE $802\mathrm{.}11$ and define the key components of the architecture.

c$)$ Briefly Explain the difference between Infrastructure mode and Ad$-$hoe mode in IEEE $802\mathrm{.}11.$

d$)$ Define the following terms in the context of wireless network.

i$)$ SSID

ii$)$ MIMO in the context of $802\mathrm{.}11$ n

iii$)$ Concept of roaming in IEEE $802\mathrm{.}11$

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$)$ Blucetooth Multipoint Connectivity.

iii$)$ Bluetooth file transfer

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