Skill in recognizing and categorizing types of vulnerabilities and associated attacks- Knowledge of basic system administration and operating system hardening techniques, Computer Network Defense policies, procedures, and regulations- Knowledge of different operational threat environments (e.g., first generation [script kiddies], second generation [non nation-state sponsored], and third generation [nation-state sponsored])- Knowledge of system and application security threats and attack methods (e.g., buffer overflow, mobile code, cross-site scripting, PL/SQL and injections, race conditions, covert channel, replay, return- oriented attacks, and malicious code). Desired Skills: - Knowledge of different operational threat environments (e.g., first generation [script kiddies], second generation [non nation-state sponsored], and third generation [nation-state sponsored])- Knowledge of system and application security threats and attack methods (e.g., buffer overflow, mobile code, cross-site scripting, PL/SQL and injections, race conditions, covert channel, replay, return- oriented attacks, and malicious code).