See the solution in explanation below.
Explanation:

You want to place these technologies to reduce attack surface and enable secure protocols for the web architecture.
Suggested placements (following typical best practices for web architectures):
* First node after Internet (Inbound Traffic Point):
* FirewallControls and filters incoming traffic from the internet to block unwanted access.
* Next node (Internal Traffic Control):
* RouterRoutes packets inside the network and can apply some filtering.
* Next layer (Between router and web infrastructure):
* WAF (Web Application Firewall)Protects web servers from attacks like XSS, SQL injection, CSRF, directory traversal by inspecting HTTP/HTTPS traffic.
* Web Servers:
* Web serverHosts the application.
* PKI Certificate:
* Applied on the web server or WAF to enable HTTPS and secure protocols (TLS).
Part 2:
