1. Before reading the text watch a video Read the text and do exercises a lans (Local Area Networks) Networking

Hub and Spoke Topology is the topology that is used to connect multiple sites.  In this type of WAN topology, there are two roles as its name implies. Hub and Spoke. Hub is the central device at one site that is connected to all the other devices. Spoke is the name of each of the other sites and devices. The Spokes are only connected to the Hub. There is not a direct connection between Spokes.

Hub and Spoke WAN Topology is less expensive if you compare this design with a Point to Point one. Because, there is no need to connect each site one by one to other sites. The only needed connection is towards Hub site.

Full Mesh WAN Topology