Denis Lisitskiy

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

CCNA

Cisco Certified Specialist - Enterprise Core

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

Cisco Certified Network Professional Enterprise (CCNP Enterprise)

Cisco Certified Specialist - Enterprise Advanced Infrastructure Implementation

Cisco Certified Network Associate Security (CCNA Security)

Cisco Certified Specialist - Security Core

Cisco Certified Network Professional Security (CCNP Security)

Cisco Certified Network Associate Wireless (CCNA Wireless)

Cisco Certified Specialist - Security Identity Management Implementation

Cisco Certified Specialist - Network Security Firepower

Cisco Certified Specialist - Network Security VPN Implementation

Cisco Certified Specialist - Web Content Security