CV0-004 Practice Exam 3 — 20 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.

Answer

Deploy instances in the same subnet behind a NAT gateway.

Answer

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.

Answer

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

Answer

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

Answer

Set up health checks to automatically replace unhealthy instances

Answer

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.

Answer

Convert each VM to an ISO image.

Answer

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

Answer

The password complexity requirements

Answer

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

Answer

Ansible playbooks with Docker modules

Answer

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.

Answer

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.

Answer

Backup frequency and retention.

Answer

Physical location of the data center.

Answer

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.

Answer

Reboot the VM to reset resource usage.

Answer

Scale up the VM to a larger instance size.

Question 11

A company uses a cloud-based backup solution for its virtual machines. The backup policy specifies daily backups with a retention of 30 days. The backup administrator notices that backups are failing with an error indicating insufficient storage space in the backup repository. Which of the following is the most likely reason for this issue?

Accepted Answer

The retention period is too long for the available storage.. The error indicates insufficient storage space in the backup repository. With a daily backup policy and a 30-day retention period, the repository must accommodate at least 30 full backups (or the equivalent incremental/differential chain). If the repository's capacity is less than the total size of 30 backups, the retention period exceeds the available storage, causing failures. This is the most direct cause of the error.

Answer

The backup frequency is too low.

Answer

Compression is not enabled on the backup.

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The backup window is too short.

Question 12

An organization wants to ensure that only authorized personnel can access the cloud management console. Which of the following is the BEST method to achieve this?

Accepted Answer

Enable multi-factor authentication (MFA) for all console users.. Multi-factor authentication (MFA) is the best method because it adds an additional layer of security beyond just a password, requiring a second factor (e.g., a time-based one-time password from an authenticator app or a hardware token). This significantly reduces the risk of unauthorized access even if credentials are compromised, as the attacker would also need the second factor. In cloud environments like AWS, Azure, or GCP, MFA is a fundamental security best practice for protecting the management console.

Answer

Implement strong password policies with complex passwords.

Answer

Disable the web console and require API access only.

Answer

Restrict console access to a specific IP address range.

Question 13

A cloud administrator is tasked with ensuring that only encrypted connections are used to transfer files to a cloud storage bucket. Which of the following should the administrator enforce?

Accepted Answer

Require HTTPS for all uploads.. HTTPS (HTTP over TLS) encrypts data in transit using TLS, ensuring that files uploaded to a cloud storage bucket are protected from eavesdropping and tampering. By requiring HTTPS for all uploads, the administrator enforces encrypted connections as mandated by the security policy, which is a standard practice for cloud storage services like AWS S3 or Azure Blob Storage.

Answer

Use HTTP with a custom header.

Answer

Allow FTP but restrict to specific IPs.

Answer

Enable SFTP access to the bucket.

Question 14

A company is migrating a legacy application to a public cloud. The application requires a static IP address for licensing. The security team insists on encrypting all traffic between the application and the database. Which of the following should the cloud architect implement?

Accepted Answer

Create a VPN connection between the application and database subnets.. Option A is correct because creating a VPN connection between the application and database subnets establishes an encrypted tunnel (using IPsec or TLS-based VPN protocols) that ensures all traffic between the two subnets is encrypted, meeting the security team's requirement. Additionally, the application's need for a static IP address can be satisfied by assigning a static private IP to the application instance within its subnet, while the VPN provides secure communication without exposing traffic to the public internet.

Answer

Assign an elastic IP and use NAT.

Answer

Use TLS certificates on the web server.

Answer

Deploy a site-to-site VPN from the cloud to the on-premises data center.

Question 15

A cloud administrator is troubleshooting an issue where a user in the finance department cannot access a critical application hosted on a private cloud. The user can access other applications in the same subnet. The security team recently implemented a new network security policy. Which of the following is MOST likely causing the issue?

Accepted Answer

A host-based firewall rule is blocking the specific application port on the user's VM.. Option D is correct because the user can access other applications in the same subnet, indicating network connectivity is intact, but a specific application is blocked. A host-based firewall rule on the user's VM (e.g., Windows Firewall or iptables) can filter traffic by port or protocol, and a newly implemented security policy likely added a rule blocking the port used by the critical application. This explains why only that application is inaccessible while others work.

Answer

The user's VM is isolated from the subnet due to a misconfigured VLAN.

Answer

The user's account has been disabled due to a failed login attempt.

Answer

The hypervisor is denying access to the application due to a resource quota violation.

Question 16

A cloud administrator is configuring a web application hosted on a public cloud VM. The application must be accessible over HTTPS, and the administrator needs to ensure that all traffic between the client and the server is encrypted. The cloud provider offers a managed certificate service. Which of the following is the BEST practice for securing the application?

Accepted Answer

Use the cloud provider's managed certificate service to provision and attach the certificate to the load balancer.. The cloud provider's managed certificate service automatically handles certificate provisioning, renewal, and attachment to the load balancer, ensuring HTTPS traffic is encrypted with a trusted certificate from a public CA. This is the best practice because it offloads TLS termination to the load balancer, reducing the VM's CPU overhead and centralizing certificate management. It also ensures the certificate is automatically renewed before expiry, preventing service disruptions.

Answer

Generate a self-signed certificate and configure the web server to use it.

Answer

Disable HTTPS and rely on network-level encryption provided by the cloud provider.

Answer

Create a certificate signing request (CSR) and submit it to a public CA, then install the certificate and private key on the VM.

Question 17

A cloud administrator is troubleshooting connectivity to a web server running on a Linux VM. The web server is configured to listen on ports 80 (HTTP) and 443 (HTTPS). The administrator runs the iptables command shown in the exhibit. Based on the output, what is the MOST likely reason that external users cannot access the web server on port 443?

Accepted Answer

The iptables rule for port 443 only allows traffic from the 10.0.0.0/8 subnet, which does not include external IP addresses.. Option D is correct because the iptables rule for port 443 specifies a source IP range of 10.0.0.0/8, which is a private RFC 1918 address space. External users have public IP addresses that do not fall within this subnet, so their HTTPS traffic is implicitly dropped by the rule's match condition. The default policy being ACCEPT does not override the explicit rule that only permits traffic from the 10.0.0.0/8 subnet.

Answer

The web server is not configured to listen on port 443, so iptables rules are irrelevant.

Answer

The iptables default policy is ACCEPT, but the rule for port 443 explicitly drops traffic from external sources.

Answer

The rule for port 80 is placed before the rule for port 443, causing all HTTPS traffic to be evaluated as HTTP and dropped.

Question 18

A cloud administrator is configuring a Linux VM as a router. The iptables rules are shown. The administrator can SSH into the VM from the network but cannot forward traffic between interfaces. What is the most likely cause?

Accepted Answer

The FORWARD chain's default policy is DROP and no rules allow forwarding. The FORWARD chain in iptables controls traffic that passes through the VM (i.e., traffic not destined for the VM itself). If its default policy is DROP and no explicit ACCEPT rules exist for forwarding, the kernel will drop all forwarded packets, preventing the VM from acting as a router. SSH access works because it uses the INPUT chain, which is separate from FORWARD.

Answer

The INPUT chain has a rule dropping invalid packets

Answer

The INPUT chain is missing a rule to allow forwarded traffic

Answer

The NAT table is misconfigured

Question 19

A cloud administrator receives an alert that a VM's disk usage is at 95%. The VM is running a critical database. Which TWO actions should the administrator take to resolve the issue while minimizing downtime?

Accepted Answer

Increase the size of the existing disk. Increasing the size of the existing disk (Option A) is correct because it allows the VM to gain additional storage capacity without requiring a reboot or migration, minimizing downtime. Modern hypervisors and cloud platforms support live resizing of virtual disks, and once the disk is expanded, the OS can extend the partition online using tools like `resize2fs` (Linux) or Disk Management (Windows). This directly addresses the 95% disk usage alert for the critical database with minimal service interruption.

Answer

Shrink an existing partition to free space

Answer

Restore the VM from a recent backup to a larger disk

Answer

Add a new disk and move data to it

Question 20

A company uses a hybrid cloud model with an AWS Direct Connect connection to its on-premises network. Users report intermittent connectivity to cloud resources. A network engineer finds packet loss on the Direct Connect virtual interface. Which of the following should be checked FIRST to resolve the issue?

Accepted Answer

The BGP session status between the on-premises router and the AWS Direct Connect endpoint. Intermittent packet loss on a Direct Connect virtual interface is most commonly caused by BGP session flapping or misconfiguration, as BGP is the routing protocol that establishes and maintains connectivity between the on-premises router and the AWS Direct Connect endpoint. Checking the BGP session status first allows the engineer to quickly identify if the issue is due to route advertisement problems, hold timer mismatches, or session resets, which are frequent root causes of intermittent packet loss.

Answer

The physical port status of the Direct Connect router

Answer

The MTU setting on the on-premises firewall

Answer

The VPN tunnel status for the Direct Connect link