These learning exercises run in this browser. They do not connect to real routers, cloud accounts or wireless hardware.
IPv4 subnet practice
Work out the network, broadcast and usable host count for an ordinary /24–/30 LAN, then check your answer. /31 and /32 special cases are deliberately outside this exercise.
Longest-prefix route practice
Installed routes: 0.0.0.0/0 via A; 10.0.0.0/8 via B; 10.1.0.0/16 via C; 10.1.2.0/24 via D.
Read and validate JSON
Make interfaces a list of objects. Each interface needs a text name and a boolean up value. Change the state and see how a program reads it. No API call is sent.
Wireless connection reasoning
This is a configuration reasoning model, not a Wi-Fi emulator. The fictional WLAN uses SSID Training-WiFi, passphrase StudyLab2026!, VLAN 30, and an available DHCP service. The passphrase is public teaching data and must not be reused.
Sources & content checks
Technical references checked on 25 October 2026. These are original teaching explanations, not official Cisco course material. See how content and lab validation are described.