A web application is often exposed to the internet and is more vulnerable to external attacks. Solution design must consider preventing attacks such as cross-site scripting (XSS) and SQL injection. These days, the Distributed Denial of Service (DDoS) attack is causing trouble for organizations. To prevent this, the appropriate tools are required, and an incident response plan needs to be put in place.

Solution architects should plan to use a Web Application Firewall (WAF) to block malware and SQL injection attacks. WAF can be used to prevent traffic from a country where you don't have a user base or to block malicious IP addresses. WAF, in combination with a Content Distribution Network (CDN), can help to prevent and handle DDoS attacks.