CV0-004 Quick Quiz — 10 Questions

Question 1

Match each cost management concept to its description.

Question 2

A load balancer log entry shows the above for a request. What is the MOST likely cause of the 504 error?

Accepted Answer

The backend server took too long to respond to the request.. A 504 Gateway Timeout error from a load balancer indicates that the load balancer sent the request to a backend server but did not receive a timely response. The load balancer has a configured timeout value (often 30-120 seconds), and if the backend server fails to respond within that window, the load balancer terminates the connection and returns a 504. This is the most common cause of 504 errors in load-balanced environments.

Answer

The DNS resolution for the domain name has failed.

Answer

The requested resource does not exist on the backend server.

Answer

The load balancer's health check is misconfigured.

Question 3

Arrange the steps to deploy a new virtual machine in a public cloud environment (e.g., AWS, Azure, GCP) in the correct order.

Question 4

Sequence the steps to troubleshoot a cloud-based application that is not accessible from the internet.

Question 5

Order the steps to migrate an on-premises database to a cloud-managed database service (e.g., RDS, Cloud SQL).

Question 6

A company uses a hybrid cloud model with an on-premises data center and a public cloud. The network team reports that traffic between the cloud and on-premises is experiencing high latency and packet loss. The cloud administrator verifies that the VPN connection is up. What is the most likely cause?

Accepted Answer

The VPN tunnel has a mismatched MTU size.. When a VPN tunnel is up but traffic experiences high latency and packet loss, a mismatched Maximum Transmission Unit (MTU) size is a common cause. This occurs because packets larger than the tunnel's MTU must be fragmented, and if fragmentation is not properly handled (e.g., due to the DF bit being set), packets are dropped, leading to retransmissions and increased latency. The symptoms align with MTU issues rather than simple connectivity or throttling problems.

Answer

A firewall rule is blocking ICMP packets.

Answer

VMs are placed in different cloud regions.

Answer

The cloud provider is throttling bandwidth.

Question 7

A cloud operations team receives an alert that the CPU usage of a VM has exceeded 90% for the past 30 minutes. The VM is part of an auto-scaling group configured to scale out when CPU exceeds 80% for 5 minutes. However, no new instances have been launched. What is the MOST likely reason the auto-scaling failed to trigger?

Accepted Answer

The auto-scaling group is in a cooldown period after a previous scaling action.. The auto-scaling group failed to trigger because it was in a cooldown period after a previous scaling action. Cooldown periods are designed to prevent rapid, successive scaling events that could destabilize the environment. During this time, the auto-scaling group ignores new alarms, even if the CPU threshold is exceeded, until the cooldown timer expires.

Answer

The VM failed a health check and is being replaced.

Answer

The auto-scaling group has reached the minimum instance count.

Answer

The CPU threshold is set too high.

Question 8

A cloud engineer is troubleshooting a web application that is not responding. The engineer examines the serial console output of the web-server instance and finds the error shown in the exhibit. What is the MOST likely cause of this issue?

Accepted Answer

A firewall rule is blocking traffic to the metadata server IP address 169.254.169.254.. The error shown in the serial console output indicates that the instance cannot reach the metadata server at 169.254.169.254. This IP address is a link-local address used by cloud providers (e.g., AWS, GCP, Azure) to serve instance metadata, including user data scripts. If a firewall rule blocks traffic to this IP, the instance cannot retrieve its user data, causing the web application to fail to start or respond.

Answer

The service account associated with the instance is missing the required permissions.

Answer

The instance is in a STOPPED state and cannot execute user data scripts.

Answer

The instance does not have a public IP address assigned.

Question 9

A company has a cloud environment with multiple VPCs that need to communicate with each other using private IP addresses. The company wants a centrally managed solution that simplifies routing and security. Which networking architecture should the architect implement?

Accepted Answer

Transit VPC with a VPN appliance. Option D is correct because a Transit VPC with a VPN appliance provides a centrally managed hub-and-spoke architecture that simplifies routing and security for multiple VPCs. The VPN appliance (e.g., a software VPN or AWS Marketplace appliance) establishes encrypted tunnels between the transit VPC and each spoke VPC, allowing private IP communication without the need for full-mesh peering or complex route tables. This design centralizes traffic inspection, policy enforcement, and routing, meeting the requirement for simplified management.

Answer

VPC peering between all VPCs

Answer

Direct Connect to each VPC

Answer

VPN connections between all VPCs

Question 10

A cloud administrator is troubleshooting connectivity to a virtual machine with IP address 10.10.10.10 from another VM on the same subnet. The output of ping and traceroute commands is shown. What is the most likely cause of the connectivity issue?

Accepted Answer

The destination VM's network interface is disabled.. The correct answer is A because a disabled network interface on the destination VM would cause the VM to be unreachable from the same subnet, even though the VM itself is powered on. Ping and traceroute would fail with no response, as the NIC is not operational at Layer 2, preventing ARP resolution and frame delivery. This matches the symptom of no connectivity despite being on the same subnet, where routing and security groups are not factors.

Answer

The destination VM is powered off.

Answer

The source VM's routing table does not have a default gateway.

Answer

The destination VM's security group is blocking ICMP.