1. Explain what is an error first callback? Please provide a coded example.

2. Explain what Promises are. Please provide a coded example.

3. What is a test pyramid? Please give an example.

4. Using the vulnerability list from OWASP as mentioned in a previous module, research one of the top 2011 vulnerabilities and how the vulnerability could be found in node.js/express.js environment and application.

5. What roles does NIST (National Institute of Standards and Technology) play in the world of cybersecurity and making sure software is secure?