Question :

(a) List down and explain the different signal propagation behaviours that radio waves exhibit.

(b) Explain the term Delay Spread with reference to signal propagation

(c) Infra Red and radio transmission are the two different basic transmission technologies that can be used to set up WLANs. Explain why radio transmission is preferred when setting up a Wireless LAN in an institution compared to infra red.

(d) IEEE 802.11 Infrastructured network has basic components such as Stations, Access Points and distributed System.

(i) Give a brief description of the functioning of an Infrastructured Network.

(ii) Show down the main functions of the Access points.

(e) Why do collisions occur in an infrastructure wireless network? Give a solution to remedy to this situation.