The author discusses overlay networks in section $2\mathrm{.}2$ of the textbook and I would the class to discuss the following for MPLS$,$MGRE, and SDN below:

The History of each of the overlay networks.

Post a sample case study and review of each of the protocols $!!$

Discuss and post challenges$($disadvantage$)$ and advantages such as implementing the protocols, security challenges, and some benefits of each overlay network $!!$