$6.$ What are the differences between the following types of wireless channel impairments: path loss, multipath propagation, interference from other sources? $(1$ points$)$

$7.$ What are the four types of wireless networks identified in our taxonomy in Section $7\mathrm{.}1?$ Which of these types of wireless networks have you used? $(1$ points$)$

$8.$ What does it mean for a wireless network to be operating in $$infrastructure mode?$$ If the network is not in infrastructure mode, what mode of operation is it in$,$ and what is the difference between that mode of operation and infrastructure mode? $(1$ points$)$