Microservice API Gateways GCSA Practice Questions (Page 7)

Questions 31–35

1. 31application · medium

   A team is deploying a new version of a payment microservice. They want to test the new version with a small percentage of traffic before rolling it out fully. The API gateway supports weighted routing. What should they configure?

   • AConfigure the gateway to route based on the user's IP address, sending all traffic from a specific region to the new version.
   • BUse the gateway to cache all responses from the old version and serve them to users during the transition.
   • CCreate a new route for the new version and gradually shift traffic weight from the old to the new route.
   • DDelete the old service and immediately route all traffic to the new version.
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2. 32expert · hard

   A company is designing a multi-tenant SaaS platform. Each tenant has its own set of microservices, and the company wants to isolate tenant traffic while still providing a unified API for clients. They are considering a centralized gateway versus a per-tenant gateway. Which consideration is most important when choosing the pattern?

   • APer-tenant gateways are easier to manage because each tenant has its own configuration.
   • BA centralized gateway is always more secure than per-tenant gateways.
   • CCentralized gateways cannot support multi-tenancy because they cannot differentiate tenants.
   • DA centralized gateway can apply tenant-specific policies based on the tenant identifier in the request, while a per-tenant gateway provides stronger isolation.
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4. 33expert · hard

   A company is performing a blue/green deployment of a microservice behind an API gateway. The gateway uses service discovery to route traffic. The team wants to test the green version with a small percentage of real traffic before switching fully. However, the service discovery mechanism only returns one version of the service. What should they do?

   • AConfigure the gateway to use weighted routing based on a header or cookie to send a percentage of traffic to the green version.
   • BUpdate the service discovery registry to point to the green version and rely on the gateway to gradually shift traffic.
   • CUse a separate gateway for the green version and manually redirect some clients.
   • DSwitch all traffic to the green version immediately and monitor for errors.
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5. 34expert · hard

   A large enterprise has multiple business units, each with its own microservices. They want to expose some services externally and keep others internal. They also want to avoid a single point of failure and allow each business unit to manage its own API policies. Which deployment pattern best meets these requirements?

   • ALet each business unit expose its services directly to the internet without a gateway.
   • BUse one centralized gateway for all traffic, internal and external.
   • CDeploy separate API gateways per business unit, with a shared global gateway for external traffic.
   • DUse sidecar proxies for all services and no gateway at all.
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6. 35application · medium

   A team needs to roll back an API gateway configuration change that caused a service outage. They have been managing the gateway configuration as code. What is the fastest and most reliable way to restore service?

   • AContact the cloud provider to restore the gateway from a backup.
   • BManually edit the gateway's live configuration to undo the change.
   • CRestart the gateway service to clear the configuration.
   • DRevert the configuration change in the source repository and redeploy the previous version.
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