John Zegers

Cisco Certified Network Associate Routing and Switching (CCNA Routing and Switching)

Cisco Certified Network Professional Routing and Switching (CCNP Routing and Switching)

Cisco Certified Network Associate Security (CCNA Security)

Cisco Certified Network Professional Security (CCNP Security)

Cisco Certified Network Associate Data Center (CCNA Data Center)

Cisco Certified Network Professional Data Center (CCNP Data Center)