INCIDENT #075 · SECURITY
The right port with the wrong transport
Hard25 minutesPro lab
The incident
An internal application uses TCP/8443. Its route and port number look correct, but its transport probe is denied. This is a packet-policy exercise, not a live application or TLS test.
Your objective
Restore the documented application transport flows and return reachability. Keep SSH blocked, preserve the working telemetry branch, and do not remove security boundaries or change interface addresses.
The network
Physical links · Service health not shown
Link addressing (3)
- R1 R2
10.155.12.0/30 - R2 R3
10.155.23.0/30 - R2 R4
10.155.24.0/30
4 devices · Cisco IOS syntax · Simulated network
What you’ll practice
Interview exercises are inspired by common industry competencies. They are not proprietary interview questions.