2. Describe a three-tier architecture, and explain why this architecture is considered a best-practice. 3. Explain how you would architect a network that includes the servers listed below. How many different tiers would you include, and where would you place the firewalls? What is the purpose of each tier (what are you protecting, or what risk are you mitigating)? a. Web server i. Must be accessible from the Internet b. Application server i. Must be accessible from Web server ii. Must be able to access Database and Credential store c. Database server i. Must be accessible from Application server d. Credential store (e.g. Active Directory) i. Must be accessible from Application server