Interview Guides
You own a Linux-based network appliance where multiple local processes handle control-plane logic, telemetry, and packet-processing tasks. A recent issue showed one process could interfere with another through an overly permissive local communication path, and debugging has been difficult because failures appear as timeouts rather than explicit errors. You need to reason about how processes should communicate on the same host and what security boundaries still apply even without network hops.
How do processes communicate with each other on the same system, and how would you compare common IPC mechanisms for performance, isolation, and security? Describe how you would choose between them for a local service architecture and how you would debug misuse or compromise of an IPC path.
