As to the Wall, the one currently under construction is on the other side of the country and isn;t connected to events in Gaza. However, Gaza has been walled (actually fenced) off for several years, which is one big reason that Gaza has not been the origin of many attacks on Israel.
The new wall is in the eastern part of the country, and takes in a part of the West Bank, separating a number of settlements from the rest of the West Bank.
If you do a Google image search for [ "west bank" wall ], you'll find several of them. Some are a little hard to understand. The part shaped like a backwards "B" is the West Bank. The wall sort of skims along the western edge of that territory, dipping in occasionally to pick up some settlements. If you have questions after looking at the maps, I'll try to help sort it out.