Spring Cloud Risk Assessment & Management 2

Question 1

Which Spring Cloud Circuit Breaker state transition occurs when the failure rate exceeds the configured threshold?

Accepted Answer

CLOSED to OPEN

Answer

When the failure rate exceeds the threshold in CLOSED state, Resilience4j transitions the circuit breaker to OPEN, blocking further calls.

Question 2

In Spring Cloud Config, what risk is mitigated by enabling the 'fail-fast' property on client services?

Accepted Answer

Services starting with stale or missing configuration

Answer

Setting spring.cloud.config.fail-fast=true ensures services refuse to start if they cannot reach the config server, preventing misconfigured deployments.

Question 3

A Spring Cloud Gateway route has no rate limiting configured. What is the primary risk this introduces?

Accepted Answer

Downstream service resource exhaustion from traffic spikes

Answer

Without rate limiting, a traffic spike or DDoS can overwhelm downstream microservices, causing cascading failures across the system.

Question 4

Which Resilience4j metric should you monitor to detect slow degradation risk before the circuit breaker opens?

Accepted Answer

resilience4j.circuitbreaker.slow.call.rate

Answer

The slow call rate metric reveals performance degradation early when calls are succeeding but taking too long, indicating an impending failure.

Question 5

In a Spring Cloud microservices architecture, what risk does service-to-service communication without mutual TLS (mTLS) introduce?

Accepted Answer

Man-in-the-middle attacks and unauthorized service impersonation

Answer

Without mTLS, internal service traffic is unencrypted and unauthenticated, allowing an attacker with network access to intercept or spoof service identities.

Spring Cloud Practice Test

Spring Cloud Practice Test

Spring Cloud Risk Assessment & Management 2