An operator configures an upstream block in a sidecar proxy registration for the `frontend` service. The upstream points to the `backend` service on local port 9090. What does this configuration tell the Consul sidecar proxy to do?

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B. Create a local listener on port 9090 so that `frontend` can connect to `backend` through the proxy. An upstream configuration in a Consul sidecar proxy registration tells the proxy to open a local listening port (9090 in this case) on the service's loopback interface. When `frontend` connects to `localhost:9090`, the proxy transparently routes that traffic to the `backend` service through the Consul service mesh. Option a confuses upstream (outbound) with listener (inbound) concepts.

An operator configures an upstream block in a sidecar proxy registration for the `frontend` service. The upstream points to the `backend` service on local port 9090. What does this configuration tell the Consul sidecar proxy to do?

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An operator configures an upstream block in a sidecar proxy registration for the frontend service. The upstream points to the backend service on local port 9090. What does this configuration tell the Consul sidecar proxy to do?

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Discussion

An operator configures an upstream block in a sidecar proxy registration for the `frontend` service. The upstream points to the `backend` service on local port 9090. What does this configuration tell the Consul sidecar proxy to do?