- (Exam Topic 1)
A company hosts an application on an Amazon EC2 instance in a single AWS Region. The application requires support for non-HTTP TCP traffic and HTTP traffic.
The company wants to deliver content with low latency by leveraging the AWS network. The company also wants to implement an Auto Scaling group with an
Elastic Load Balancer.
How should a SysOps administrator meet these requirements?

1. A. Create an Auto Scaling group with an Application Load Balancer (ALB). Add an Amazon CloudFront distribution with the ALB as the origin.
2. B. Create an Auto Scaling group with an Application Load Balancer (ALB). Add an accelerator with AWS Global Accelerator with the ALB as an endpoint.
3. C. Create an Auto Scaling group with a Network Load Balancer (NLB). Add an Amazon CloudFront distribution with the NLB as the origin.
4. D. Create an Auto Scaling group with a Network Load Balancer (NLB). Add an accelerator with AWS Global Accelerator with the NLB as an endpoint.

Correct Answer: D
AWS Global Accelerator and Amazon CloudFront are separate services that use the AWS global network and its edge locations around the world. CloudFront improves performance for both cacheable content (such as images and videos) and dynamic content (such as API acceleration and dynamic site delivery). Global Accelerator improves performance for a wide range of applications over TCP or UDP by proxying packets at the edge to applications running in one or more AWS Regions. Global Accelerator is a good fit for non-HTTP use cases, such as gaming (UDP), IoT (MQTT), or Voice over IP, as well as for HTTP use cases that specifically require static IP addresses or deterministic, fast regional failover. Both services integrate with AWS Shield for DDoS protection.
https://medium.com/awesome-cloud/aws-difference-between-application-load-balancer-and-network-load-balan https://aws.amazon.com/global-accelerator/faqs/?nc1=h_ls

- (Exam Topic 1)
A company is rolling out a new version of its website. Management wants to deploy the new website in a limited rollout to 20% of the company's customers. The company uses Amazon Route 53 for its website's DNS solution.
Which configuration will meet these requirements?

1. A. Create a failover routing polic
2. B. Within the policy, configure 80% of the website traffic to be sent to the original resourc
3. C. Configure the remaining 20% of traffic as the failover record that points to the new resource.
4. D. Create a multivalue answer routing polic
5. E. Within the policy, create 4 records with the name and IP address of the original resourc
6. F. Configure 1 record with the name and IP address of the new resource.
7. G. Create a latency-based routing polic
8. H. Within the policy, configure a record pointing to the original resource with a weight of 80. Configure a record pointing to the new resource with a weight of 20.
9. I. Create a weighted routing polic
10. J. Within the policy, configure a weight of 80 for the record pointing to the original resourc
11. K. Configure a weight of 20 for the record pointing to the new resource.

Correct Answer: C

- (Exam Topic 1)
A company has a stateful web application that is hosted on Amazon EC2 instances in an Auto Scaling group. The instances run behind an Application Load Balancer (ALB) that has a single target group. The ALB is configured as the origin in an Amazon CloudFront distribution. Users are reporting random logouts from the web application.
Which combination of actions should a SysOps administrator take to resolve this problem? (Select TWO.)

1. A. Change to the least outstanding requests algorithm on the ALB target group.
2. B. Configure cookie forwarding in the CloudFront distribution cache behavior.
3. C. Configure header forwarding in the CloudFront distribution cache behavior.
4. D. Enable group-level stickiness on the ALB listener rule.
5. E. Enable sticky sessions on the ALB target group.

Correct Answer: BE
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/Cookies.html
You can configure each cache behavior to do one of the following: Forward all cookies to your origin – CloudFront includes all cookies sent by the viewer when it forwards requests to the origin. https://docs.aws.amazon.com/elasticloadbalancing/latest/application/sticky-sessions.html
By default, an Application Load Balancer routes each request independently to a registered target based on the chosen load-balancing algorithm.

- (Exam Topic 1)
A company hosts its website in the us-east-1 Region. The company is preparing to deploy its website into the eu-central-1 Region. Website visitors who are located in Europe should access the website that is hosted in eu-central-1. All other visitors access the website that is hosted in us-east-1. The company uses Amazon Route 53 to manage the website's DNS records.
Which routing policy should a SysOps administrator apply to the Route 53 record set to meet these requirements?

1. A. Geolocation routing policy
2. B. Geoproximity routing policy
3. C. Latency routing policy
4. D. Multivalue answer routing policy

Correct Answer: A
geolocation "Geolocation routing lets you choose the resources that serve your traffic based on the geographic location of your users, meaning the location that DNS queries originate from. For example, you might want all queries from Europe to be routed to an ELB load balancer in the Frankfurt region."
Could be confused with geoproximity - "Geoproximity routing lets Amazon Route 53 route traffic to your resources based on the geographic location of your users and your resources. You can also optionally choose to route more traffic or less to a given resource by specifying a value, known as a bias. A bias expands or shrinks the size of the geographic region from which traffic is routed to a resource" the use case is not needed as per question.
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-policy.html

- (Exam Topic 1)
An organization is running multiple applications for their customers. Each application is deployed by running a base AWS CloudFormation template that configures a new VPC. All applications are run in the same AWS account and AWS Region. A SysOps administrator has noticed that when trying to deploy the same AWS CloudFormation stack, it fails to deploy. What is likely to be the problem?

1. A. The Amazon Machine image used is not available in that region.
2. B. The AWS CloudFormation template needs to be updated to the latest version.
3. C. The VPC configuration parameters have changed and must be updated in the template.
4. D. The account has reached the default limit for VPCs allowed.

Correct Answer: D