Diagnose Slow Network Throughput Including Containers

A service has unexpectedly low network throughput, including when running inside a container. Explain how you would isolate the bottleneck. ### Constraints & Assumptions The source asks for a low-speed investigation and container-specific reasoning. No protocol, topology, or network provider is fixed. Distinguish application processing from transport and infrastructure limits. ### Clarifying Questions Is the problem throughput, latency, connection setup, or intermittent failure? Which endpoints and paths are affected? Does the same workload behave differently on the host and in the container? ### What a Strong Answer Covers A layered comparison, packet loss/retransmission and bandwidth-delay effects, host/container limits, MTU/path issues, and evidence-driven experiments. ### Follow-up Questions How can a CPU bottleneck resemble a network limit? Why might a single connection underuse available bandwidth? What would you compare before blaming the container network overlay?