Nutanix NCP-CI-AWS Practice Questions

Explanation:
To control network traffic at the individual User VM (UVM) subnet level, creating a custom security group is the appropriate action. This approach allows for fine-grained control over inbound and outbound traffic rules that can be applied to specific subnets or individual instances within those subnets.

Custom Security Group:
Custom security groups enable administrators to define specific traffic rules tailored to the needs of individual subnets or VMs. This includes specifying allowed IP ranges, ports, and protocols. By applying these custom security groups to the UVMs, the organization can control access and enhance security according to their policies and requirements.

Steps to Create a Custom Security Group:

• Navigate to the AWS Management Console and go to the VPC service.
• Select "Security Groups" under the "Security" section.
• Click on "Create Security Group" and define the name, description, and VPC.
• Add inbound and outbound rules according to the desired traffic control policies.
• Attach the custom security group to the UVMs or subnets in question.

Explanation:
The error message in the image indicates that the cluster creation failed due to reaching the maximum retries for provisioning cluster nodes. Here are two possible scenarios that could lead to this issue:

Insufficient Permissions (Answer B):
If the AWS user or role used to create the cluster does not have sufficient permissions, it can result in failures during the provisioning process. Proper IAM policies must be attached to ensure that the necessary actions can be performed, such as launching instances, creating VPCs, or managing networking components.

AWS Quota Exceeded/Instance Limit Exceeded (Answer D):
AWS imposes quotas and limits on the number of instances and other resources that can be created within an account. If these quotas are exceeded, new instances cannot be provisioned, causing the cluster creation to fail. This can be resolved by requesting a quota increase from AWS.

Explanation:

• A valid CIDR range: A CIDR (Classless Inter-Domain Routing) range is necessary for creating the subnets within the VPC. This range defines the IP address space for the cluster and its components.
• A my.nutanix.com account: This account is required to access Nutanix services, including the NC2 console, manage licenses, and perform other administrative tasks.
• AWS Direct Connect and an on-premises Prism Central environment are not prerequisites for deploying an NC2 on AWS cluster. While Direct Connect can be used for enhanced network performance and connectivity, it is not a requirement for deployment. Similarly, having an on-premises Prism Central environment is not mandatory for NC2 deployment on AWS.

Explanation:
When creating a new NC2 cluster using an existing AWS VPC infrastructure, two private subnets are needed. These subnets are used as follows:

• One private subnet for user VMs, which houses the virtual machines that users interact with.
• Another private subnet for cluster management, which is used for internal cluster operations and management tasks, ensuring that management traffic is isolated from user traffic for security and performance reasons.

Explanation:

• When deploying a new NC2 cluster, the AWS Directory Service must be able to resolve the address gateway-external-api.cloud.nutanix.com.
• This external API gateway is critical for the NC2 cluster to communicate with Nutanix services for operations such as management, updates, and licensing.
• Ensuring that this address can be resolved allows the cluster to interact properly with the Nutanix cloud infrastructure and services.

Explanation:
To provide VMs with outbound internet connectivity in AWS using a private subnet, the administrator needs to create the following components in the VPC:
Private Subnet: A private subnet is required to house the VMs that need outbound internet access but do not require direct inbound access from the internet.
NAT Gateway: A NAT (Network Address Translation) Gateway is necessary to allow instances in the private subnet to connect to the internet or other AWS services while preventing the internet from initiating a connection with those instances.
Public EIP (Elastic IP Address): An EIP is associated with the NAT Gateway to provide a persistent public IP address that allows outbound internet traffic from the private subnet to be routed correctly.
Route Table: A route table is configured to route traffic from the private subnet to the NAT Gateway for outbound internet access.