Application Delivery KCNA Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   Which of the following is a common security feature provided by an API gateway?

   • AScanning container images for vulnerabilities
   • BEncrypting data at rest in the database
   • CAuthentication and authorization of client requests
   • DMutual TLS between database replicas
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A team is evaluating a canary release of a new version of their payment service. They want to ensure the new version is not degrading the user experience. Which metric should they monitor to directly assess user-perceived performance?

   • ANumber of replicas
   • BMemory usage of the service
   • CRequest latency (e.g., p99)
   • DCPU utilization of the pods
   Reveal Solution Discussion Select an answer first
4. 13foundation · easy

   When would round robin load balancing be the most appropriate choice compared to least connections?

   • AWhen sticky sessions are required for user state
   • BWhen requests can take anywhere from milliseconds to minutes
   • CWhen backends have vastly different processing capabilities
   • DWhen all backend requests have similar and predictable processing times
   Reveal Solution Discussion Select an answer first
5. 14expert · hard

   A company is considering implementing a service mesh to improve observability and security. However, they are concerned about the additional latency and operational complexity. They have a small number of services and a simple traffic pattern. What should they do?

   • AUse a lightweight service mesh like Linkerd to minimize overhead
   • BImplement a service mesh to get all the benefits
   • CAvoid any additional tooling and rely on the application code for security and observability
   • DStart with simpler solutions like mTLS via cert-manager and monitoring with Prometheus
   Reveal Solution Discussion Select an answer first
6. 15application · medium

   A company runs a microservices application on Kubernetes. One service, called 'orders', is deployed with 5 replicas. The operations team notices that one replica consistently handles more requests than the others, causing uneven resource usage. They want to distribute traffic more evenly across all replicas. What should they configure?

   • ASet the Service's externalTrafficPolicy to Local
   • BChange the Service's sessionAffinity to ClientIP
   • CUse a headless Service and rely on client-side load balancing
   • DConfigure the Service to use a load balancing algorithm that considers backend load, such as least connections
   Reveal Solution Discussion Select an answer first