Cisco Certified Entry Network Technician certification is a pre-requisite to CCNA Security certification.
The CCNA Security Certification course covers concepts from describing and listing mitigation methods for common network attacks, mitigation methods for Worm, Virus, and Trojan Horse attacks, describing the Cisco Self Defending Network architecture, securing Cisco routers using the SDM Security Audit feature, using the One-Step Lockdown feature in SDM to secure a Cisco router, securing administrative access to Cisco routers by setting strong encrypted passwords, securing administrative access to Cisco routers by configuring multiple privilege levels, securing administrative access to Cisco routers by configuring role-based CLI and describing the features of TACACS+ and RADIUS AAA protocols to defining network-based vs. host-based intrusion detection and prevention and IPS technologies, attack responses, and monitoring options.