You should for sure use a lot more active searching in your exam prep, researching, gathering and gleaning information is essential in IT and information security.
Probably on encryption and I’m unsure on diagrams - check the exam outline.
You should be aware of common TCP/UDP ports(you should know them, but know how the services work on them -remember in many environments in real life ports can be ‘swizeled’, that is to say changed) you won’t need the last bit for CC. The best advice I can give you is Lear how the OSI seven layer conceptual model works(PDNTSPA) and understand how’s data is encapsulated. TCP/IP is a suite of protocols with four layers - how do they map to OSI seven layer protocol? Which ones are connection oriented vs best effort? What are the trade offs? Knowing the context in which the components of the system operates will help you understand the how and why, and this is invaluable. Check this out:
Personally when studying I read for forty minutes taking notes, then I rest for ten after that I review my notes and anything I don’t understand I look up in a different source(invariably the internet these days).
Before your exam you should have had a coffee(or what you prefer) and a light snack.