Differentiate between Ad-Hoc and Infrastructure Access Point (AP) topology and also explain each topology advantages and disadvantages?

Wireless Access Points and MANets

1.  Differentiate between Ad-Hoc and Infrastructure Access Point (AP) topology and also explain each topology advantages and disadvantages?

2.  Describe a Mobile Ad Hoc Network (MANET)

3.  What is the main node to node routing issue in MANETs and what approach is use with LAN-layer and IP routing to mitigate this issue?