Problem Statement
What is a Denial-of-Service (DoS) attack and how can networks defend against it?
Explanation
A DoS attack overwhelms a target system with excessive traffic, making it unavailable to legitimate users. Distributed DoS (DDoS) attacks amplify this by using multiple compromised systems. Defense strategies include rate limiting, firewalls, load balancing, and using anti-DDoS services. In interviews, discuss both preventive measures and detection tools like intrusion detection systems or content delivery networks.