TLS is just one of those things that is going to be on the exam, there is no way to avoid it. Mainly because TLS is heavily emphasized in all your books. Especially when they mention encrypting web traffic.
The CISSP Computerized Adaptive Testing is going to be here starting December 18, 2017!
It totally caught me off-guard, there really was no confirmation or a prior announcement. If there was an announcement, the (ISC)² only told a select few at private conferences. We had at least 6 months notice before The Great CBK Change of 2015!
The OSI Model is used to describe how data moves from your networked computer to an application in another network. Instead of trying to memorize all the layers, the protocols, and what device belongs in which layer, it is better to just know the concepts.
Here is an excerpt from the OSI Model video from the members section of the site.