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Ehsan Hosseini is a Network Security Engineer with more than 13 years building and defending enterprise networks, from LAN/WAN and data centre switching through to next-generation firewalls, identity-based access control, and security monitoring.
His hands-on stack covers Cisco Nexus and IOS, Cisco ISE for network access control, F5 LTM and ASM, and FortiGate, Cisco FTD/ASA, and Juniper SRX firewalls. On the visibility side he's built Splunk SIEM deployments for real-time traffic monitoring and incident response, plus Zabbix, SolarWinds, and PRTG. He's also rolled out open-source security tooling including PrivacyIDEA (MFA) and JumpServer (PAM).
Project work includes a multi-area OSPF redesign for a national railway network and routing optimisation across a national utility backbone.
Ehsan has taught networking and security since 2020, covering CCNA, Network+, Security+, CCNP Enterprise (ENCOR and ENARSI), SCOR, SNCF, CEH, and PWK. His classes follow the same pattern every time: build the topology, break it, fix it together.
The Fortinet NSE4 certification is one of the most recognised firewall credentials in network security. It validates your ability to configure, manage, and troubleshoot FortiGate...