Question # 1
| A company has workloads that run in a VPC. The workloads access Amazon S3 by using an S3 gateway endpoint. The company also has on-premises workloads that need to access Amazon
S3 privately over a VPN connection. The company has established the VPN connection to the VPC.
Which solution will provide connectivity to Amazon S3 from the VPC workloads and the on-premises workloads in the MOST operationally efficient way? | | A. Deploy a proxy fleet of Amazon EC2 instances in the VPC behind an Application Load Balancer (ALB). Configure the on-premises workloads to use the ALB as the proxy server to connect to Amazon S3. Configure the proxy fleet to use the S3 gateway endpoint to connect to Amazon S3. | | B. Delete the S3 gateway endpoint. Create an S3 interface endpoint. Deploy a proxy fleet of Amazon EC2 instances in the VPC behind an Application Load Balancer (ALB).
Configure the on-premises workloads to use the ALB as the proxy server to connect to Amazon S3. Configure the proxy fleet and the VPC workloads to use the S3 interface
endpoint to connect to Amazon S3. | | C. Create an S3 interface endpoint. Configure an on-premises DNS resolver to resolve the S3 DNS names to the private IP addresses of the S3 interface endpoint. Use the S3
interface endpoint to access Amazon S3. Continue to use the S3 gateway endpoint for the VPC workloads to access Amazon S3. | | D. Set up an AWS Direct Connect connection. Create a public VIF. Configure on-premises routing to route the S3 traffic over the public VIF. Make no changes to the on-premises
workloads. Continue to use the S3 gateway endpoint for the VPC workloads to access Amazon S3. |
C. Create an S3 interface endpoint. Configure an on-premises DNS resolver to resolve the S3 DNS names to the private IP addresses of the S3 interface endpoint. Use the S3
interface endpoint to access Amazon S3. Continue to use the S3 gateway endpoint for the VPC workloads to access Amazon S3.
Explanation:
The correct solution is to use an S3 interface endpoint and an on-premises DNS resolver. An S3 interface endpoint allows you to access Amazon S3 using private IP addresses within your VPC. An on-premises DNS resolver can be configured to forward the DNS queries for the S3 domain names to the S3 interface endpoint, so that the on-premises workloads can access Amazon S3 privately over the VPN connection. This solution is operationally efficient, as it does not require any additional infrastructure or changes to the existing workloads. The VPC workloads can continue to use the S3 gateway endpoint, which provides lower latency and higher throughput than the S3 interface endpoint.
Question # 2
Your company runs an application for the US market in the us-east-1 AWS region. This application uses proprietary TCP and UDP protocols on Amazon Elastic Compute Cloud (EC2) instances. End users run a real-time, front-end application on their local PCs. This front-end application knows the DNS hostname of the service.
You must prepare the system for global expansion. The end users must access the application with lowest latency.
How should you use AWS services to meet these requirements?
| | A. Register the IP addresses of the service hosts as “A” records with latency-based routing policy in Amazon Route 53, and set a Route 53 health check for these hosts. | | B. Set the Elastic Load Balancing (ELB) load balancer in front of the hosts of the service, and register the ELB name of the main service host as an ALIAS record with a latency-based routing policy in Route 53. | | C. Set Amazon CloudFront in front of the host of the service, and register the CloudFront name of the main service as an ALIAS record in Route 53. | | D. Set the Amazon API gateway in front of the service, and register the API gateway name of the main service as an ALIAS record in Route 53. |
B. Set the Elastic Load Balancing (ELB) load balancer in front of the hosts of the service, and register the ELB name of the main service host as an ALIAS record with a latency-based routing policy in Route 53.
Question # 3
A company uses a 1 Gbps AWS Direct Connect connection to connect its AWS environment to its on-premises data center. The connection provides employees with access to an application VPC that is hosted on AWS. Many remote employees use a company-provided VPN to connect to the data center. These employees are reporting slowness when they access the application during business hours. On-premises users have started to report similar slowness while they are in the office.
The company plans to build an additional application on AWS. On-site and remote employees will use the additional application. After the deployment of this additional application, the company will need 20% more bandwidth than the company currently uses. With the increased usage, the company wants to add resiliency to the AWS connectivity. A network engineer must review the current implementation and must make improvements within a limited budget.
What should the network engineer do to meet these requirements MOST cost-effectively? | | A. Set up a new 1 Gbps Direct Connect dedicated connection to accommodate the additional traffic load from remote employees and the additional application. Create a link aggregation group (LAG). | | B. Deploy an AWS Site-to-Site VPN connection to the application VPC. Configure the on-premises routing for the remote employees to connect to the Site-to-Site VPN connection. | | C. Deploy Amazon Workspaces into the application VPInstruct the remote employees to connect to Workspaces.
| | D. Replace the existing 1 Gbps Direct Connect connection with two new 2 Gbps Direct Connect hosted connections. Create an AWS Client VPN endpoint in the application VPC. Instruct the remote employees to connect to the Client VPN endpoint. |
A. Set up a new 1 Gbps Direct Connect dedicated connection to accommodate the additional traffic load from remote employees and the additional application. Create a link aggregation group (LAG).
Explanation:
Setting up a new 1 Gbps Direct Connect dedicated connection to accommodate the additional traffic load from remote employees and the additional application would provide more bandwidth and lower latency than a VPN connection over the public internet1. Creating a link aggregation group (LAG) with the existing and new Direct Connect connections would provide resiliency and redundancy for the AWS connectivity.
Question # 4
| A company is migrating an existing application to a new AWS account. The company will deploy the application in a single AWS Region by using one VPC and multiple Availability Zones. The application will run on Amazon EC2 instances. Each Availability Zone will have several EC2 instances. The EC2 instances will be deployed in private subnets.
The company's clients will connect to the application by using a web browser with the HTTPS protocol. Inbound connections must be distributed across the Availability Zones and EC2 instances. All connections from the same client session must be connected to the same EC2 instance. The company must provide end-to-end encryption for all connections between the clients and the application by using the application SSL certificate.
Which solution will meet these requirements? | | A. Create a Network Load Balancer. Create a target group. Set the protocol to TCP and the port to 443 for the target group. Turn on session affinity (sticky sessions). Register the EC2 instances as targets. Create a listener. Set the protocol to TCP and the port to 443 for the listener. Deploy SSL certificates to the EC2 instances. | | B. Create an Application Load Balancer. Create a target group. Set the protocol to HTTP and the port to 80 for the target group. Turn on session affinity (sticky sessions) with an application-based cookie policy. Register the EC2 instances as targets. Create an HTTPS listener. Set the default action to forward to the target group. Use AWS Certificate Manager (ACM) to create a certificate for the listener. | | C. Create a Network Load Balancer. Create a target group. Set the protocol to TLS and the port to 443 for the target group. Turn on session affinity (sticky sessions). Register the EC2 instances as targets. Create a listener. Set the protocol to TLS and the port to 443 for the listener. Use AWS Certificate Manager (ACM) to create a certificate for the application. | | D. Create an Application Load Balancer. Create a target group. Set the protocol to HTTPS and the port to 443 for the target group. Turn on session affinity (sticky sessions) with an application-based cookie policy. Register the EC2 instances as targets. Create an HTTP listener. Set the port to 443 for the listener. Set the default action to forward to the target group. |
A. Create a Network Load Balancer. Create a target group. Set the protocol to TCP and the port to 443 for the target group. Turn on session affinity (sticky sessions). Register the EC2 instances as targets. Create a listener. Set the protocol to TCP and the port to 443 for the listener. Deploy SSL certificates to the EC2 instances.
Question # 5
A data analytics company has a 100-node high performance computing (HPC) cluster. The HPC cluster is for parallel data processing and is hosted in a VPC in the AWS Cloud. As part of the data processing workflow, the HPC cluster needs to perform several DNS queries to resolve and connect to Amazon RDS databases, Amazon S3 buckets, and on-premises data stores that are accessible through AWS Direct Connect. The HPC cluster can increase in size by five to seven times during the company’s peak event at the end of the year.
The company is using two Amazon EC2 instances as primary DNS servers for the VPC. The EC2 instances are configured to forward queries to the default VPC resolver for Amazon Route 53 hosted domains and to the on-premises DNS servers for other on-premises hosted domain names. The company notices job failures and finds that DNS queries from the HPC cluster nodes failed when the nodes tried to resolve RDS and S3 bucket endpoints.
Which architectural change should a network engineer implement to provide the DNS service in the MOST scalable way? | | A. Scale out the DNS service by adding two additional EC2 instances in the VPC. Reconfigure half of the HPC cluster nodes to use these new DNS servers. Plan to scale out by adding additional EC2 instance-based DNS servers in the future as the HPC cluster size grows. | | B. Scale up the existing EC2 instances that the company is using as DNS servers. Change the instance size to the largest possible instance size to accommodate the current DNS load and the anticipated load in the future. | | C. Create Route 53 Resolver outbound endpoints. Create Route 53 Resolver rules to forward queries to on-premises DNS servers for on premises hosted domain names. Reconfigure the HPC cluster nodes to use the default VPC resolver instead of the EC2 instance-based DNS servers. Terminate the EC2 instances. | | D. Create Route 53 Resolver inbound endpoints. Create rules on the on-premises DNS servers to forward queries to the default VPC resolver. Reconfigure the HPC cluster nodes to forward all DNS queries to the on-premises DNS servers. Terminate the EC2 instances. |
C. Create Route 53 Resolver outbound endpoints. Create Route 53 Resolver rules to forward queries to on-premises DNS servers for on premises hosted domain names. Reconfigure the HPC cluster nodes to use the default VPC resolver instead of the EC2 instance-based DNS servers. Terminate the EC2 instances.
Question # 6
| A banking company has an application that must connect to specific public IP addresses from a VPC. A network engineer has configured routes in the route table that is associated with the application's subnet to the required public IP addresses through an internet gateway.
The network engineer needs to set up email notifications that will alert the network engineer when a user adds a default route to the application subnet's route table with the internet gateway as a target.
Which solution will meet these requirements with the LEAST implementation effort? | | A. Create an AWS Lambda function that reads the routes in the route table and sends an email notification. Configure the Lambda function to send an email notification if any route is configured with 0.0.0.0/0 or ::/0 CIDRs to the internet gateway. Configure the Lambda function to run every minute. | | B. Create an AWS Lambda function that will be invoked by an Amazon EC2 CreateRoute API call. Configure the Lambda function to send an email notification. Configure the Lambda function to send an email notification if any route is configured with 0.0.0.0/0 or ::/0 CIDRs to the internet gateway. | | C. Create AWS Config rules for the route table by using the internet-gateway-authorized-vpc-only managed rule. Create an Amazon EventBridge rule to match the AWS Config rule and to route to an Amazon Simple Notification Service (Amazon SNS) topic to send an email notification. | | D. Create an AWS Config rule for the route table by using the no-unrestricted-route-to-igw managed rule. Create an Amazon EventBridge rule to match the AWS Config rule and to route to an Amazon Simple Notification Service (Amazon SNS) topic to send an email notification. |
C. Create AWS Config rules for the route table by using the internet-gateway-authorized-vpc-only managed rule. Create an Amazon EventBridge rule to match the AWS Config rule and to route to an Amazon Simple Notification Service (Amazon SNS) topic to send an email notification.
Question # 7
A Network Engineer is provisioning a subnet for a load balancer that will sit in front of a fleet of application servers in a private subnet. There is limited IP space left in the VPC CIDR. The application has few users now but is expected to grow quickly to millions of users.
What design will use the LEAST amount of IP space, while allowing for this growth?
| A. Use two /29 subnets for an Application Load Balancer in different Availability Zones.
| B. Use one /29 subnet for the Network Load Balancer. Add another VPC CIDR to the VPC to allow for future growth.
| C. Use two /28 subnets for a Network Load Balancer in different Availability Zones.
| D. Use one /28 subnet for an Application Load Balancer. Add another VPC CIDR to the VPC to allow for future growth.
|
C. Use two /28 subnets for a Network Load Balancer in different Availability Zones.
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