An overall rise in mobility, coupled with the falling cost of Wi-Fi equipment, has led to a proliferation of Wi-Fi hot spots in public areas to provide Internet accessibility. Thus, this proliferation has also engendered growing security concerns.

(a) By making use of a diagram, describe the typical architecture for Wi-Fi hotspots.

(b) Describe what the term session hijacking means. Differentiate between active session hijacking and passive session hijacking.

(c) In terms of Wi-Fi hotspot security, explain on the following risks:

i. Spoofed provider access
ii. Service theft attack

(d) Discuss on the defensive security mechanisms that can be employed in order to better secure public Wi-Fi hotspots.