20+ practice questions focused on Resilience And Fault Injection — one of the most tested topics on the Istio Certified Associate (ICA, CNCF/Linux Foundation) (ICA) exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Resilience And Fault Injection PracticeWhich TWO fields are required when configuring an 'abort' fault injection in a VirtualService?
Explanation: Option A (httpStatus) is correct because an abort fault in an Istio VirtualService must specify the HTTP status code to return to the client, e.g., httpStatus: 500, which defines the failure response injected into the request path. Option E (percentage) is correct because the abort fault requires a percentage block (value plus optional fixedDelay) that determines what proportion of requests receive the aborted response, e.g., percentage: {value: 100}. Options B (maxDuration) and D (delay) are incorrect because they belong to timeout and delay fault configurations, not abort faults. Option C (grpcStatus) is incorrect because abort faults use httpStatus for HTTP traffic; gRPC status codes are not a field of the abort fault specification.
Which field in the trafficPolicy of a DestinationRule controls the maximum number of pending requests in the connection pool?
Explanation: maxRequestsPerConnection is used for HTTP/1.1 and maxPendingRequests for total pending requests.
What is the default timeout for an HTTP request in Istio when no VirtualService is defined?
Explanation: Istio defaults to 15 seconds for request timeouts if not explicitly configured.
Which TWO options are required to properly implement an abort fault injection in a VirtualService?
Explanation: In Istio's VirtualService fault injection, an abort fault is defined under the `fault.abort` field and requires exactly two subfields: `httpStatus` and `percentage`. Option B (`httpStatus`) is correct because the abort fault must specify the HTTP status code (e.g., 503) that the sidecar will return to the client instead of forwarding the request. Option C (`percentage`) is correct because it defines the proportion of requests (0–100) that will be aborted, allowing controlled fault injection. Option A (`headers`) is not required — headers are used in match conditions or header manipulation, not in the abort fault itself. Option D (`match`) is not required — match rules are optional and only restrict which requests the fault applies to, not part of the abort definition. Option E (`fixedDelay`) is incorrect because `fixedDelay` belongs to a delay fault (`fault.delay.fixedDelay`), not an abort fault.
You want to simulate a 5-second network latency for 10% of requests to the 'cart' service. Which VirtualService configuration is correct?
Explanation: The fault injection delay policy requires both a percentage and a fixedDelay duration.
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2. Review every explanation
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