Optimize Cluster Performance Using Monitoring and Scaling Features VCAP-VCF-SUPPORT Practice Questions (Page 1)

Questions 1–5

1. 1expert · hard

   A VKS cluster is running a web application that experiences predictable traffic spikes during business hours. The cluster is currently sized for peak load, but the administrator wants to reduce costs by scaling down during off-peak hours. The application is stateless and can handle pod rescheduling. What is the most appropriate scaling strategy?

   • AManually add and remove worker nodes from the VKS cluster based on the time of day
   • BUse the Kubernetes Horizontal Pod Autoscaler (HPA) to scale pods based on CPU utilization
   • CIncrease the CPU reservation on the VKS node VMs to ensure they have enough resources during peak hours
   • DUse the Cluster Autoscaler to automatically add and remove worker nodes based on pending pods
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2. 2application · medium

   A VKS cluster is experiencing high latency for network-bound workloads. The administrator reviews the vCenter performance charts and notices that the 'Network Data Receive Rate' for the VKS node VMs is high, but the 'Network Dropped Transmitted Packets' and 'Network Dropped Received Packets' metrics are also elevated. What is the most likely cause of the latency?

   • AThe VKS node VMs have too many vCPUs allocated
   • BThe physical network adapters on the ESXi hosts are saturated
   • CThe virtual switch is configured with an incorrect MTU size
   • DThe VKS node VMs have insufficient memory for their network buffers
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4. 3foundation · easy

   In vCenter performance charts, what is the default time interval for real-time monitoring?

   • A1 hour
   • B5 minutes
   • C20 seconds
   • D1 minute
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5. 4application · medium

   A VKS node VM is experiencing poor performance. The administrator reviews the vCenter performance charts and sees that the 'Memory Ballooning' metric is consistently high, while 'Memory Usage' is also high. What does this indicate about the VM's memory state?

   • AThe VM has more memory allocated than it needs
   • BThe VM is using memory compression to increase its effective memory
   • CThe VM is under memory pressure and the hypervisor is reclaiming memory from it
   • DThe VM's memory is being swapped to disk
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6. 5foundation · easy

   Which resource allocation setting is used to control the maximum CPU or memory that a VM can consume?

   • ALimit
   • BReservation
   • COverhead
   • DShares
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