AWS VPC Scenario based Questions ❓
❓You need to ensure that your instances in a private subnet can access the internet for software updates. What AWS service should you use?
Answer: You should use a NAT Gateway. This allows instances in a private subnet to access the internet while keeping them private.
❓An application running in your VPC needs to connect to an on-premises data center securely. What should you configure?
Answer: You should set up a VPN Gateway and create a VPN connection to connect your VPC to the on-premises data center.
❓You have two VPCs in different regions and you need them to communicate with each other. What AWS service would you use?
Answer: Use VPC Peering. Note that VPC Peering connections must be within the same region. For inter-region peering, you need to configure peering connections between the VPCs in different regions.
❓You want to allow traffic from a specific IP range to reach instances in your VPC while blocking all other IP ranges. How can you achieve this?
Answer: Configure a Security Group to allow inbound traffic from the specific IP range and ensure all other traffic is denied by default.
❓Your VPC needs to host an application that must be accessible from the internet, but instances must not have public IP addresses. What is the best way to achieve this?
Answer: Use an Application Load Balancer (ALB) in front of your instances. The ALB can have a public IP, while the instances themselves remain in a private subnet without public IPs.
❓You need to monitor the traffic flowing through your VPC for security auditing purposes. What feature can help you with this?
Answer: Use VPC Flow Logs. They capture and log information about the IP traffic going to and from network interfaces in your VPC.
❓An application in your VPC needs to connect to an AWS service, such as S3, without going through the internet. What should you use?
Answer: Use a VPC Endpoint for the AWS service. This allows private connections to AWS services without using public IPs or the internet.
❓You have an EC2 instance in a public subnet that needs to communicate with a database instance in a private subnet. What is the best way to ensure secure communication?
Answer: Configure Security Groups and Network Access Control Lists (NACLs) to allow traffic between the EC2 instance and the database instance on the necessary ports.
❓You have a VPC with multiple subnets. How can you ensure that traffic between these subnets is only allowed for specific instances?
Answer: Use Security Groups to control the inbound and outbound traffic between instances in different subnets. Ensure that the Security Group rules are configured to allow traffic only from the required instances.
❓You need to create a new VPC and ensure that it has internet access. What steps should you take?
Answer: Create an Internet Gateway (IGW) and attach it to your VPC. Then, update the route table of the subnet to route traffic to the IGW for internet access.
❓How can you limit access to your VPC to only a specific set of IP addresses from the internet?
Answer: Use Network Access Control Lists (NACLs) to configure rules that permit traffic only from specific IP ranges to your VPC.
❓You have a multi-tier application running in your VPC. How can you restrict access to the database tier only to the application tier?
Answer: Use Security Groups to allow traffic from the application tier instances to the database tier instances. Ensure that the database Security Group allows inbound traffic only from the application Security Group.
❓Your application requires instances in your VPC to access a private network within your organization. What should you configure?
Answer: Set up a Direct Connect connection or a VPN Gateway to establish a private connection between your VPC and your on-premises network.
❓How can you ensure that instances in a private subnet have internet access for updates, but are not directly reachable from the internet?
Answer: Deploy a NAT Gateway in a public subnet and configure the route table of the private subnet to route internet-bound traffic through the NAT Gateway.
❓You have multiple VPCs and want to share a common set of resources like a database or application. What AWS feature allows this?
Answer: Use VPC Peering or Transit Gateway to enable communication and resource sharing between multiple VPCs.
❓An EC2 instance in a private subnet needs to resolve domain names to IP addresses. What should you configure?
Answer: Ensure that the DHCP Options Set associated with your VPC is configured with the appropriate DNS servers, or use Amazon Route 53 Resolver.
❓You want to prevent instances in your VPC from accessing specific websites or IP addresses on the internet. What can you use?
Answer: Configure Route Tables with custom routes or use a Web Application Firewall (WAF) to restrict access based on URLs or IP addresses.
❓Your VPC requires high availability across multiple geographic locations. How can you achieve this?
Answer: Deploy your VPC across multiple Availability Zones (AZs) within a region to ensure high availability and fault tolerance.
❓You need to connect your VPC with a third-party service provider securely. What AWS service can help you with this?
Answer: Use PrivateLink to create private endpoints for secure and scalable connections to third-party services within your VPC.
❓Your VPC has several public and private subnets. How can you ensure that traffic between the public and private subnets is controlled and monitored?
Answer: Use Security Groups and NACLs to control and monitor traffic between subnets. Configure logging and monitoring to keep track of traffic patterns and access.
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