Feel free to look here. All posts are chronological. Maybe there’s something new?
Dairy, cows and country lifeCisco: IOS basicsBasics of WiFiSetting up IPsec between UniFi and OPNsenseFirewalls and UTM’sCisco: Packet TracerThe OSI-modelHubs, Routers and SwitchesNetwork troubleshooting and toolsWhat is NAT?