HANDS-ON. NOT HYPOTHETICAL.
Lab library
Pick a challenge. Follow the evidence. Find your fix.
Available
DNS· Beginner
DNS Resolution Failure
The internet works, but websites won’t load. Trace the problem and restore name resolution.
15 minLaunch lab
Available
DHCP· Beginner/Intermediate
Workstation Cannot Obtain an IP Address
PC-02 fell back to APIPA. Trace DHCP DORA, find the VLAN fault, and restore a valid lease.
20 minLaunch lab
Available
VLAN· Intermediate
VLAN Configuration Problem
VLAN 20 traffic cannot cross the switches. Inspect the 802.1Q trunk, repair its allowed list, and verify connectivity.
25 minLaunch lab
Available
Firewall· Intermediate
HTTPS Traffic Blocked by Firewall Policy
Ping works, but HTTPS fails. Trace firewall decisions and restore access with a least-privilege policy.
25 minLaunch lab
Available
VPN· Advanced
Site-to-Site VPN Tunnel Is Down
Phase 1 succeeds but Phase 2 fails. Compare traffic selectors, repair the mismatch, and restore the IPsec tunnel.
35 minLaunch lab