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Browse 6 real-world technical and behavioral interview questions about Networking. Review scenarios, edge cases, and architectural best practices.
Work up the layers and let each command eliminate a class of cause: resolve the name, check the route, see whether anything is listening, then decide from the failure mode whether packets are being refused, silently dropped, or answered by something that never replies.
eBPF-based Kubernetes network policy can enforce hard multi-tenancy with faster identity-aware checks than long iptables chains, but it demands verifier-safe rollouts, fail-closed controls, and strong policy observability.
TCP guarantees an ordered byte stream and pays for it with head-of-line blocking and retransmissions that arrive too late to be useful. UDP is right when a late packet is worthless, when you need multicast, or when you intend to build your own reliability with different trade-offs.
Kernel bypass moves packet handling into user space so a market-data read no longer pays a syscall boundary, a kernel-to-user copy, interrupt and softirq handling, or a scheduler wakeup. You pay for it with a core burned on busy-polling, the loss of standard network tooling, and a driver-specific build. It also connects networking to the point an interviewer is testing.
Separate the layers that can fail together: routing reachability, name resolution, identity and physical access. Then build an access path that shares none of them, keep controls failing static rather than closed, and rehearse the emergency path often enough that it is known to work.
Evaluate the integration of kernel-bypass techniques to handle millions of simultaneous connections and minimise CPU overhead in MMO architectures.