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CKA study material · question 798 of 1000

Two containers in the same Pod need to talk to each other. Which networking problem is that, in the documentation's terms?

  1. Pod-to-Pod communication
  2. Pod-to-Service communication
  3. External-to-Service communication
  4. Container-to-container communication, solved by the shared Pod and localhost
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Answer: D. Container-to-container communication, solved by the shared Pod and localhost

Highly coupled container-to-container traffic is solved by placing them in one Pod and letting them use localhost; the other three problems concern Pods, Services and external clients.

Source: Cluster Networking (Kubernetes) — Cluster Networking (overview)

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