cisco
mikroTik
redhat linux

Redhat Certified System Administrator (RHCSA)
Linux is an open source and community-developed operating system for computers, servers, mainframes, mobile devices and embedded devices. It is supported.

Redhat Certified Engineer (RHCE)
Linux is an open source and community-developed operating system for computers, servers, mainframes, mobile devices and embedded devices. It is supported on almost every major computer platform including x86, ARM and SPARC

Industrial Advance Linux
Linux is an open source and community-developed operating system for computers, servers, mainframes, mobile devices and embedded devices. It is supported on almost every major computer platform including x86, ARM.
Microsoft

Microsoft Certified Solution Associate (MCSA)
Microsoft is present in nearly every work environment. Windows is the most popular operating system in the world. Microsoft Server is the industry standard. Azure cloud services ower an ever-increasing number of businesses processes.