KCNA Cloud Native Architecture Practice Question
Which of the following patterns is used to improve resilience by isolating failures to a subset of components?
⚠ Common exam trap
CNCF often tests the distinction between patterns that prevent cascading failures (Bulkhead) versus patterns that handle transient failures (Retry/Timeout) or protect against repeated failures (Circuit Breaker), leading candidates to confuse the goal of isolation with failure detection or recovery.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Bulkhead
The Bulkhead pattern (D) is correct because it isolates failures by partitioning resources (e.g., thread pools, connections) into separate pools for different components or services. This prevents a failure in one component from exhausting shared resources and cascading to others, directly improving resilience by containing the blast radius.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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