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B is correct
A key feature of a container network in Kubernetes (or any container orchestration system) is to enable network communication between containers, even when they are running on different nodes in the cluster. This is essential for distributed applications and microservices to function properly. A. Proxying REST requests: This is typically handled by service meshes or API gateways, not the container network itself. C. Same-host communication: While important, it's a basic feature; cross-host communication is more critical and complex. D. Caching remote disk access: This relates to storage, not networking.
A key feature of a container network is to enable communication between containers running on separate hosts. This is essential for distributed applications where different components of the application may be running on different nodes in a cluster. Container networks provide the necessary infrastructure to ensure that containers can discover and communicate with each other across the network, regardless of the physical host they are running on.