1Z0-1072-26 Practice Questions

Question 1

You are managing a large OKE cluster and notice that pods are failing to schedule because the worker nodes have run out of ephemeral storage. What is the most robust architectural solution to address this?

Accepted Answer

Increase the size of the worker node boot volumes in the node pool configuration or add node pools with larger boot volumes.. Ephemeral storage on OKE nodes is tied to the boot volume or local storage. To fix ephemeral storage exhaustion, you can resize the worker node boot volumes, add node pools with larger boot volumes, or configure emptyDir volumes to use specific storage mediums.

Answer

Change the VCN MTU size from 9000 to 1500.

Answer

Attach a Block Volume to the Kubernetes control plane nodes.

Answer

Restart the Kubernetes API server.

Question 2

You are deploying a Container Engine for Kubernetes (OKE) cluster and want to ensure that worker nodes are distributed across separate physical hardware infrastructures to maximize fault tolerance. Which feature should you configure during cluster creation?

Accepted Answer

Node Pool Fault Domains. Fault domains ensure that instances are distributed across physical hardware that has independent power and top-of-rack switches. OKE supports specifying fault domains or availability domains for node pools.

Answer

VCN Route Tables

Answer

Kubernetes Horizontal Pod Autoscaler

Answer

Pod Security Policies

Question 3

You need to resize the boot volume of an existing OCI Linux compute instance to provide more disk space for application logs. What is the correct sequence of actions?

Accepted Answer

Modify the boot volume size in the OCI Console, then use OS-level commands (such as `resizepart` and `xfs_growfs`) to extend the file system.. To expand a boot volume, you first update the boot volume size in the OCI Console, and then you must log in to the instance and extend the operating system partition and file system to recognize the new capacity.

Answer

Terminate the instance, detach the boot volume, attach it to another instance, expand it, and reattach it.

Answer

Reboot the instance; OCI automatically detects the new size and extends the file system partitions automatically.

Answer

Create a new block volume, mount it as the root directory, and delete the old boot volume.

Question 4

You are migrating a legacy application to OCI. The application requires a specific network interface card (NIC) virtualization mode and custom UEFI boot parameters that are not standard. Where should you configure these custom launch options?

Accepted Answer

In the Custom Image launch options settings. Launch options can be customized when creating a custom image or by updating the launch options of an existing custom image in OCI to specify firmware, network virtualization, and boot options.

Answer

Inside the VCN Security List configurations

Answer

Via the compute instance's operating system kernel parameters

Answer

In the Instance Configuration template parameters

Question 5

You are setting up an autoscaling configuration for an instance pool. You want the pool to scale out when CPU utilization exceeds 80% and scale in when CPU utilization drops below 20%. What type of autoscaling policy should you create?

Accepted Answer

Metric-based autoscaling policy. Metric-based autoscaling policies allow you to define rules based on metrics such as CPU or memory utilization to scale out or scale in instances automatically.

Answer

Event-driven autoscaling policy

Answer

Schedule-based autoscaling policy

Answer

Manual capacity override policy

Question 6

You have a fleet of compute instances running in a private subnet. You want to patch their operating systems regularly using OCI OS Management service without exposing them to the public internet. What must be configured in your VCN?

Accepted Answer

A Service Gateway and a route table rule pointing traffic destined for Oracle Services to the Service Gateway. To allow private instances to access Oracle services like OS Management or Object Storage without public internet access, you must configure a Service Gateway and a corresponding route table entry.

Answer

A NAT Gateway with public IP attachment

Answer

An Internet Gateway with security list ingress rules

Answer

A Local Peering Gateway connected to Oracle's internal network

Question 7

You have an OKE cluster and want to expose multiple HTTP and HTTPS microservices running in your cluster externally using a single public IP address and path-based routing. Which OCI native component should you deploy?

Accepted Answer

OCI Load Balancer with Kubernetes Ingress Controller. OCI Load Balancer or Native Ingress Controller integrated with OCI Load Balancer allows you to route external traffic to different Kubernetes services based on paths or hostnames.

Answer

Internet Gateway directly attached to worker node pods

Answer

Service Gateway

Answer

OCI Network Load Balancer

Question 8

You are running a stateful application inside an OKE cluster that requires persistent storage backed by OCI Block Volumes. When a pod is rescheduled to a different worker node due to a node failure, how does the Persistent Volume (PV) behave?

Accepted Answer

The OCI Block Volume CSI driver automatically detaches the volume from the old node and attaches it to the new worker node.. OCI Block Volume CSI (Container Storage Interface) driver dynamically detaches the block volume from the failed worker node and attaches it to the new worker node where the rescheduled pod is running, preserving data persistence.

Answer

You must manually log into the OCI Console, detach the volume, and attach it to the new worker node.

Answer

The persistent volume is converted to Object Storage automatically.

Answer

The data is permanently lost because block volumes cannot move across worker nodes.

Question 9

You are deploying an application on OCI Functions. The function requires external Python packages that are not part of the standard library. How should you include these dependencies?

Accepted Answer

Include the dependencies in the requirements.txt file within the function directory before building and deploying.. When building OCI Functions, dependencies are included in the function's directory (e.g., in a `requirements.txt` file for Python) so that the `fn build` command packages them into the container image.

Answer

Install them manually via SSH on the function's underlying compute node after deployment.

Answer

Upload the packages as objects to Object Storage and configure the function to download them at runtime.

Answer

Store them in an OCI Vault and reference them as environment variables.

Question 10

Which TWO of the following statements are true regarding OCI Compute Instance Maintenance and Events? (Choose two.)

Accepted Answer

OCI sends notifications when underlying infrastructure maintenance is scheduled for a compute instance.. OCI notifies customers of scheduled infrastructure maintenance and provides options such as rebooting or migrating instances before maintenance windows.

Answer

Maintenance events cause permanent data loss on attached boot volumes.

Answer

Instance maintenance events can only be managed using Terraform scripts.

Answer

Customers have zero visibility into hardware retirement schedules and cannot take preemptive action.

Question 11

Which TWO of the following statements are true regarding OCI Compute Flexible Shapes? (Choose two.)

Accepted Answer

Flexible shapes support both AMD EPYC and Ampere ARM processor architectures.. Flexible shapes allow independent scaling of OCPUs and memory. They are available for both AMD and Ampere processor architectures across VM instances.

Answer

Flexible shapes are only available for Bare Metal instances and cannot be used with Virtual Machines.

Answer

Once a flexible compute instance is launched, its OCPU and memory allocations can never be modified.

Answer

Flexible shapes require a fixed ratio of 8 GB of RAM per 1 OCPU.

Question 12

You have an OCI compute instance configured with an autoscaling policy. The autoscaling configuration scales out your instance pool by 2 instances when CPU exceeds 75%. You notice that during a traffic surge, the pool scales out, but shortly after, it scales right back in, causing flapping. How can you prevent this behavior?

Accepted Answer

Increase the autoscaling cooldown period.. Configuring an appropriate cooldown period (step delay) ensures that autoscaling waits a specified duration after a scaling event before evaluating metrics again.

Answer

Disable instance health checks entirely.

Answer

Decrease the instance pool maximum limit to 1.

Answer

Change the VCN route table timeout.

Question 13

You are troubleshooting a performance issue on an OCI compute instance. You suspect that the instance is experiencing CPU throttling due to credits being exhausted. Which compute shape type are you most likely using?

Accepted Answer

Standard AMD Flexible Shape with baseline OCPU performance enabled. Burstable instances (such as VM.Standard.E3.Flex or VM.Standard.E4.Flex configured with baseline OCPU utilization or specific micro/standard burstable settings) use CPU credits. If credits are exhausted, performance is throttled to the baseline.

Answer

HPC (High-Performance Computing) Shape

Answer

Bare Metal Standard Shape

Answer

GPU Shape

Question 14

Which THREE security best practices should be implemented when deploying and managing OCI Functions? (Choose three.)

Accepted Answer

Using dynamic groups and IAM policies to grant functions least-privilege access to other OCI resources. Security best practices for functions include using dynamic groups and IAM policies for least-privilege resource access, storing sensitive strings in OCI Vault, and deploying functions in private subnets with VCN integration.

Answer

Hardcoding tenancy administrator credentials in environment variables for easy access

Answer

Disabling authentication on API Gateways triggering functions to allow open public access

Question 15

Which command-line interface tool is used for managing core OCI infrastructure such as compute instances, VCNs, and block volumes?

Accepted Answer

oci CLI. The `oci` CLI (OCI Command Line Interface) is the comprehensive tool used to manage core OCI services.

Answer

kubectl

Answer

docker

Answer

fn

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