Security and protection features help block the theft and leakage of data by protecting Web applications from application-layer attacks. A NetScaler allows legitimate client requests and can block malicious requests. It provides built-indefenses against denial of service (DoS) attacks and supports features that protect the application against legitimate surges in application traffic that wouldotherwise overwhelm the servers. An available built-in firewall protects Web applications from application-layer attacks, including buffer overflow exploits,SQL injection attempts, cross-site scripting attacks, and more. In addition, the firewall provides identity theft protection by securing confidential corporate information and sensitive customer data.