ZSK sp. z o.o. achieve following Extreme Networks certificates in 2020:

Black Diamond
Master Campus
Master Cloud & Applications
Master Data Center
Master Edge
Cloud, Management &  Automation
Data  Center
ExtremeSwitching
ExtremeWireless
Security &  Access Control
ECS - Campus EXOS Switching & Routing
ECS - Data Center SLX -  SLX Configuration and Implementation
ECS - Extreme Control
ECS - ExtremeWireless Cloud
ECS - ExtremeWireless Core
ECS - Management Center
EDS - Access Wireless
EDS - Campus Fabric
EDS - Data Center
EDS - ExtremeWireless Cloud
EDS - ExtremeWireless Core
EDS - IP Campus
EDS - IP Campus
EDS - Management Center
ESS - Data Center
ESS - ExtremeWireless
ESS - Software
ESS - Switching
Certified Wireless Network Administrator (CWNA)
ECE - Networking
ECS - Access Wireless
ESS - Overview
Extreme Hero