Q # 4: Describe the role of the beacon frames in 802.11. Q # 5: What are the differences between a master device in a Bluetooth network and a base station in an 802.11 network? Q # 6: What is the difference between a permanent address and a care-of address? Q # 7: If a node has a wireless connection to the internet, does that node have to be mobile? Explain. Suppose that a user with a laptop walks around her house with her laptop, and always access the internet through the same access point. Is this user mobile from a network standpoint? Explain