Looking at your examples I would have to say that all three of those questions are off topic here.
From the help centrehelp centre:
Super User is for computer enthusiasts and power users. If you have a question about …
- computer hardware,
- computer software, or
- personal and home computer networking
Your first and third questions fail to meet the requirements for personal computer networking
Your second example is essentially a shopping recommendation for "go find me some network protocols" and would also be off topic as too broad.
