Which technique distributes web server load across multiple servers to increase reliability?

• A. WAFW00F
• B. OWASP ZAP
• C. DNS Interrogation
• D. Load Balancer

Answer: (D)

Distributing web requests across multiple servers to increase reliability is accomplished with a load balancer. A load balancer sits in front of a pool of servers and forwards incoming client requests to one of the healthy servers, using algorithms such as round-robin, least connections, or capacity-based methods. It continuously checks the health of each server and stops sending traffic to any that fail, automatically rerouting to others. This setup prevents a single server from becoming a bottleneck or a single point of failure, improving both availability and scalability. It can also offer features like SSL offloading and session persistence as needed, and it often runs in a redundant pair to avoid a single point of failure.

The other tools mentioned aren’t about spreading load. WAFW00F is used to fingerprint or identify web application firewalls, not to balance traffic. OWASP ZAP is a security scanner for finding vulnerabilities in web apps. DNS Interrogation involves querying DNS to gather domain-to-IP mappings and related information, not distributing user requests across servers.