Firewall Interview Questions

Recently, I gave an interview for network security engineer and these Firewall questions were asked. For the benefit of SecGuru readers I am posting the questions here.

• Firewall, what is that, how it works, how it is diff from ACLs?
• Describe, generally, how to manage a firewall?
• What is a Denial of Service attack and its safeguards?
• What is a “spoofed” packet?
• What is a SYN Flood?
• What is an Application Layer Firewall?
• Define and describe TCP Wrappers. What are the reasons for using TCP Wrappers in addition to a host-based firewall?

-Amiable