1Z0-1072-26 Compute Practice Test 3 — 15 Questions

Question 1

Which OCI service feature enables you to automatically create identical compute instances based on an instance configuration and adjust the pool size based on demand?

Accepted Answer

Instance Pools and Autoscaling. Instance Pools combined with Autoscaling Configurations allow you to manage groups of identical instances and scale them automatically.

Answer

Dedicated Virtual Machine Hosts

Answer

Compute Cluster Placement Groups

Answer

Managed File Storage

Question 2

Which OCI compute feature allows you to group multiple compute instances together into a low-latency, high-bandwidth physical placement group?

Accepted Answer

Cluster Placement Groups. Cluster Placement Groups in OCI are a compute feature that logically groups compute instances within a single availability domain to provide low-latency, high-bandwidth network connectivity. They are designed for tightly coupled workloads like HPC, big data, and machine learning that require high-speed inter-node communication. By placing instances in close physical proximity, cluster placement groups minimize network latency and maximize throughput.

Answer

Dynamic Routing Groups

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IAM Security Zones

Answer

Autonomous Linux Pools

Question 3

You want to deploy a Windows compute instance in OCI using your own custom software pre-installed. What is the recommended workflow to achieve this?

Accepted Answer

Launch an instance from a standard Windows image, install your software, create a custom image from the boot volume, and use it to launch new instances.. The recommended OCI workflow for deploying Windows instances with custom software is to launch a standard Windows instance, install and configure the software, then create a custom image from the boot volume and use that image for future launches. This captures the fully configured state and ensures consistent, repeatable deployments.

Answer

Upload your local virtual machine disk (VMDK/VHD) directly to a compute instance as a running process.

Answer

Run a bash script via user data on every new instance launch to download and install the software every time.

Answer

Use Block Volume backups as direct instance templates without creating custom images.

Question 4

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.. Pods failing to schedule due to exhausted ephemeral storage on worker nodes are best addressed by increasing the boot volume size of the worker nodes in the node pool configuration, or by adding node pools with larger boot volumes. Ephemeral storage on OKE worker nodes is backed by the boot volume, so expanding it directly increases the capacity available to pods for emptyDir, logs, and container writable layers. This is the most robust architectural fix because it addresses the root capacity constraint.

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 5

You are configuring an autoscaling policy for an instance pool. You choose a schedule-based policy to scale out the pool to 20 instances every Monday at 8:00 AM. What happens if an instance within the pool fails due to hardware degradation during the weekend when the pool size is set to 5?

Accepted Answer

The instance pool automatically replaces the failed instance immediately to maintain the current desired capacity of 5.. Instance pools continuously maintain their desired capacity by monitoring instance health and automatically replacing any instance that fails, regardless of whether a schedule-based autoscaling policy is active. The schedule only dictates when the desired count changes (e.g., scaling to 20 on Monday), not whether failed instances are replaced. Therefore, a hardware failure on the weekend triggers immediate replacement to keep the pool at its current desired size of 5.

Answer

The failed instance is left in a failed state until Monday at 8:00 AM when the scheduled scaling event runs.

Answer

The autoscaling configuration disables itself due to a health check failure.

Answer

The entire instance pool is shut down to prevent data corruption.

Question 6

You are migrating an on-premises virtual machine image in QCOW2 format to OCI. Before you can launch compute instances from this image in OCI, what must you do with the file?

Accepted Answer

Upload the image to an Object Storage bucket and import it as a custom image.. To migrate a QCOW2 image to OCI, you upload the file to an Object Storage bucket and then import it as a custom image via the OCI Console or CLI. OCI supports QCOW2 and VMDK formats for custom image import.

Answer

Convert the file to an ISO and mount it using the OCI Console virtual console.

Answer

Attach the QCOW2 file to a VCN subnet as a storage gateway resource.

Answer

Upload the QCOW2 file directly to a compute instance boot volume via SSH.

Question 7

What is the primary function of the OCI Compute Instance Oracle Cloud Agent?

Accepted Answer

To perform plugin-based management tasks like monitoring, patching, and run commands on the instance.. The Oracle Cloud Agent is a lightweight process that runs on OCI compute instances and hosts plugins for management tasks such as monitoring, patching (OS Management), running commands, and collecting metrics. It is the agent that enables services like the Monitoring plugin, Compute Instance Run Command, and Vulnerability Scanning. Its primary function is plugin-based instance management, not networking or orchestration.

Answer

To route TCP/IP packets across VCN subnets at the hypervisor level.

Answer

To provide serverless execution environments for OCI Functions.

Answer

To manage Kubernetes cluster worker node lifecycles.

Question 8

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 9

You are running an application on an OKE cluster. You want to ensure that specific pods belonging to a high-priority database caching tier are never scheduled onto the same worker node as each other to avoid a single node failure taking down the entire cache tier. What Kubernetes feature should you configure?

Accepted Answer

Pod Anti-Affinity. Kubernetes pod anti-affinity allows you to specify rules that prevent pods with matching labels from being scheduled on the same node, availability domain, or fault domain.

Answer

Persistent Volume Claims

Answer

Kubernetes Network Policies

Answer

Horizontal Pod Autoscaler

Question 10

You want to deploy an OCI Function and test it locally on your developer workstation before pushing it to Oracle Functions Registry. Which command in the fn CLI initializes a new function project template?

Accepted Answer

fn init. The 'fn init' command initializes a new function project by scaffolding the required directory structure, including func.yaml, func.py (or other runtime handler), and requirements.txt. It is the first step before building or deploying a function with the fn CLI.

Answer

fn deploy --local

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fn build local

Answer

fn create function

Question 11

You have an instance pool with 5 instances. You update the associated instance configuration with a new custom image containing security patches. How do you apply this new configuration to the existing instances in the pool?

Accepted Answer

Use the instance pool update action to trigger a rolling update or instance replacement with the new configuration.. In OCI, when you update an instance configuration that is attached to an instance pool, the pool does not automatically apply the changes to existing instances. You must explicitly trigger an update on the instance pool, which initiates a rolling replacement of instances according to the pool's update policy (e.g., batch size, wait time). This replaces each instance with a new one built from the updated configuration, ensuring the new custom image and security patches are applied. The update action is the designed mechanism for propagating configuration changes to a pool's instances.

Answer

Delete the instance pool and create a completely new pool, as instance configurations cannot be updated once linked.

Answer

Reboot each instance individually via the OS command line.

Answer

Attach the new custom image directly as a secondary boot volume to all running instances.

Question 12

Which OCI compute shape family is designed specifically for general-purpose workloads, balancing CPU, memory, and network resources?

Accepted Answer

Standard Shapes. Standard Shapes are OCI's general-purpose compute family, offering a balanced ratio of CPU, memory, and network bandwidth suitable for web servers, application servers, and dev/test workloads. They use Intel, AMD, or Ampere processors and are the default choice when no specialized hardware profile is required.

Answer

Dense I/O Shapes

Answer

HPC Shapes

Answer

GPU Shapes

Question 13

You are planning to deploy a high-performance computing (HPC) cluster on OCI requiring extremely high packet per second (PPS) and ultra-low latency between compute nodes. Which feature must you utilize?

Accepted Answer

Cluster Networks with RDMA (Remote Direct Memory Access). Cluster Networks with RDMA provide a high-bandwidth, ultra-low-latency interconnect specifically designed for HPC workloads on OCI. RDMA allows direct memory-to-memory transfers between compute nodes, bypassing the OS kernel and CPU, which drastically reduces latency and increases packet per second (PPS) throughput. This is the only OCI feature that delivers the required performance for tightly-coupled HPC applications.

Answer

NAT Gateway with bandwidth throttling disabled

Answer

Public IP addresses on all compute nodes

Answer

OCI Local Peering Gateway

Question 14

You have an existing compute instance with a standard boot volume size of 47 GB. Your application requires 200 GB. You successfully increase the boot volume size to 200 GB in the OCI Console. However, when you run `df -h` inside the guest OS, it still shows 47 GB. What is the cause?

Accepted Answer

The guest OS partition and file system have not yet been resized to claim the expanded storage.. While OCI resizes the physical storage block device at the hypervisor level, the guest operating system partition and file system must be manually or automatically extended to utilize the new space.

Answer

OCI does not support expanding boot volumes online; you must reboot the instance.

Answer

You must detach the boot volume and reattach it for the OS to notice the change.

Answer

Boot volumes have a hard cap of 50 GB unless converted to Block Volumes.

Question 15

When creating an OCI Function application, you must select one or more subnets. What type of subnets should you choose if your function needs to call external public APIs over the internet?

Accepted Answer

Subnets associated with a NAT Gateway or Internet Gateway route table. For an OCI Function to call external public APIs over the internet, the subnet it runs in must have a route to the internet — either through a NAT Gateway (for private subnets, outbound-only) or an Internet Gateway (for public subnets). The route table associated with the function's subnet must contain a rule directing 0.0.0.0/0 to one of these gateways. Without such a route, the function has no path to external endpoints.

Answer

Subnets with a Service Gateway only

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Subnets configured strictly as local peering endpoints

Answer

Subnets with no route table entries