Are you planning to take the SY0-401 Security+ or SY0-501 Security+ exam? If so, make sure you understand basic network components.
As an example, see if you can answer this sample Security+ question.
Q. Management at your organization wants to prevent employees from accessing social media sites using company-owned computers. Which of the following devices would you implement?
A. Transparent proxy
B. Reverse proxy
C. Nontransparent proxy
D. Caching proxy
Check out the answer and explanation here.