CV0-004 Timed Practice Test 5 — 10 Questions

Question 1

A cloud administrator is deploying a critical application that requires the lowest possible latency between compute instances. The instances will be running in a private subnet and must communicate with each other using their private IP addresses. Which of the following deployment configurations would best meet these requirements?

Accepted Answer

Deploy instances in a placement group within the same Availability Zone.. Deploying instances in a placement group within the same Availability Zone ensures they are physically close together, often in the same rack or cluster, which minimizes network hops and achieves the lowest possible latency. This configuration is ideal for latency-sensitive applications because it leverages non-blocking, high-bandwidth inter-instance communication without traversing additional network infrastructure.

Answer

Deploy instances in different Availability Zones within the same region.

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Deploy instances in the same subnet behind a NAT gateway.

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Deploy instances in different regions and use inter-region peering.

Question 2

A company uses an automated patching solution that reboots instances after applying patches. After a recent patching cycle, several web servers failed to rejoin the load balancer pool. The administrator checks the application logs and finds that the web service failed to start because a required dependency was removed during patching. Which of the following should the administrator implement to prevent this issue in the future?

Accepted Answer

Configure a pre-patch health check and verify critical dependencies.. Option D is correct because implementing a pre-patch health check that verifies critical dependencies ensures that the patching process does not remove or break required components. This proactive validation can detect missing dependencies before the reboot, allowing the administrator to remediate or halt the patching cycle, preventing the web service from failing to start.

Answer

Require manual approval before each patching operation.

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Increase the patching frequency to reduce the number of patches per cycle.

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Implement a rolling update strategy for the web servers.

Question 3

A cloud administrator is deploying a web application that must be highly available across two availability zones. The deployment includes an application load balancer and multiple EC2 instances. Which TWO configurations are required to meet the high availability requirement?

Accepted Answer

Launch EC2 instances in at least two availability zones. Option A is correct because launching EC2 instances in at least two availability zones ensures that if one AZ fails, the application continues to serve traffic from the other AZ. This is a fundamental requirement for achieving high availability across AZs, as it distributes the compute capacity across physically separate data centers.

Answer

Use a single EC2 instance with an auto-recovery policy

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Set up health checks to automatically replace unhealthy instances

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Enable cross-zone load balancing on the ALB

Question 4

An organization is migrating its on-premises virtualization environment to a public cloud. The current environment uses VMware vSphere with VM templates. The cloud provider supports importing VMs in OVF format. Which step should the cloud administrator take to prepare the VMs for migration?

Accepted Answer

Export each VM as an OVF template.. The cloud provider supports importing VMs in OVF format, which is an open standard for packaging and distributing virtual appliances. Exporting each VM as an OVF template from VMware vSphere creates the necessary .ovf descriptor file and accompanying disk files (e.g., .vmdk) that the provider can directly import. This is the correct preparation step because it produces the exact format required by the target cloud platform.

Answer

Take a snapshot of each VM and copy the snapshot files.

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Convert each VM to an ISO image.

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Copy the VM's VMDK files and import them as VHDX.

Question 5

Which TWO of the following are valid considerations when deploying a virtual machine in a cloud environment? (Choose two.)

Accepted Answer

The instance size and family. Option C is correct because the instance size and family directly determine the virtual machine's compute capacity, including vCPUs, memory, and network performance. Selecting the appropriate size and family ensures the workload has sufficient resources without over-provisioning, which is a fundamental deployment consideration in cloud environments like AWS EC2 or Azure VMs.

Answer

The log retention policy

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The password complexity requirements

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The number of virtual CPUs assigned to the hypervisor

Question 6

A company has a hybrid cloud environment with on-premises servers and AWS. They deploy a new application using AWS Elastic Beanstalk with a load balancer and auto scaling group. The application is a Node.js API that connects to an RDS MySQL database. After deployment, users report that the API returns a '500 Internal Server Error' intermittently. The application logs show 'ETIMEDOUT' errors when connecting to the database. The database is deployed in a private subnet with a security group that allows inbound traffic from the Elastic Beanstalk environment's security group. The database connection string uses the RDS endpoint. The same application works perfectly when deployed on-premises. What is the most likely cause?

Accepted Answer

The Elastic Beanstalk environment is in a different VPC or subnet that cannot reach the RDS instance. The intermittent 'ETIMEDOUT' errors indicate a network connectivity issue between the Elastic Beanstalk environment and the RDS database. Since the application works on-premises, the problem is specific to the AWS networking configuration. The most likely cause is that the Elastic Beanstalk environment is deployed in a different VPC or subnet that lacks routing or a VPC peering connection to reach the RDS instance's private subnet, causing timeouts when the load balancer or auto scaling group instances attempt to connect.

Answer

The database connection string uses the wrong port number

Answer

The security group attached to the RDS instance does not allow traffic from the Elastic Beanstalk environment

Answer

The RDS instance is in a failed state and needs to be rebooted

Question 7

A cloud architect must design a deployment for a containerized microservices application. The requirements include automated scaling based on CPU utilization, rolling updates with zero downtime, and service discovery. Which orchestration feature should be used?

Accepted Answer

Kubernetes with Horizontal Pod Autoscaler. Kubernetes with Horizontal Pod Autoscaler (HPA) is the correct choice because HPA automatically scales the number of pod replicas based on observed CPU utilization (or custom metrics), meeting the automated scaling requirement. Kubernetes also supports rolling updates with zero downtime via its Deployment controller, which gradually replaces old pods with new ones while maintaining service availability. Additionally, Kubernetes provides built-in service discovery through DNS (CoreDNS) and Services, allowing microservices to find each other by name without external dependencies.

Answer

Docker Compose with a reverse proxy

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Ansible playbooks with Docker modules

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AWS ECS with Fargate

Question 8

A cloud administrator is managing a hybrid cloud environment where on-premises servers connect to a public cloud VPC via a site-to-site VPN. Users report intermittent connectivity issues to cloud resources. The administrator examines the VPN tunnel logs and sees 'Phase 2 negotiation failed' errors. Which of the following is the MOST likely cause?

Accepted Answer

Mismatched encryption domain definitions (traffic selectors) between on-premises and cloud VPN gateways.. Phase 2 negotiation failures in IPsec VPNs indicate that the two gateways cannot agree on the security associations (SAs) for encrypting data traffic. This is most commonly caused by mismatched encryption domain definitions (traffic selectors), such as differing local/remote subnets, protocols, or ports. When the on-premises and cloud VPN gateways define the allowed traffic differently, they cannot establish the Phase 2 SA, leading to intermittent connectivity.

Answer

Dead Peer Detection (DPD) is disabled on one side.

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Incorrect pre-shared key used for the VPN tunnel.

Answer

Packet loss due to high latency on the internet link.

Question 9

A company is migrating its on-premises database to a cloud-based managed database service. The database is currently 500 GB and is expected to grow by 10% monthly. Which TWO factors should the company consider when selecting the storage type?

Accepted Answer

Encryption at rest requirements.. Encryption at rest is a critical consideration when selecting storage for a cloud-based managed database service, as it ensures data is encrypted when stored on disk. Many cloud providers offer transparent data encryption (TDE) or server-side encryption with customer-managed keys (CMKs), and the storage type must support these features to meet compliance requirements.

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Backup frequency and retention.

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Physical location of the data center.

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Operating system compatibility with the storage.

Question 10

A cloud engineer notices that a virtual machine (VM) in a public cloud environment is consistently running at 90% CPU during business hours. The VM hosts a customer-facing web application. Which of the following is the BEST initial troubleshooting step?

Accepted Answer

Review the VM's performance metrics and application logs.. Option B is correct because the initial step in troubleshooting high CPU usage is to gather diagnostic data. Reviewing the VM's performance metrics (e.g., CPU utilization, memory, disk I/O) and application logs helps identify whether the issue is caused by a legitimate workload spike, a memory leak, or a misconfiguration. This aligns with the 'identify before act' principle in cloud operations, ensuring the engineer understands the root cause before making changes.

Answer

Migrate the VM to a different availability zone.

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Reboot the VM to reset resource usage.

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Scale up the VM to a larger instance size.