AWS Local Zones IP Address Assignment for EC2 Instances: Best Practices and Recommendations

AWS Local Zones IP Address Assignment

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Question

A media company uses hybrid connectivity to access video editing applications deployed on EC2 instances launched in custom VPC in the us-west-1 region.

Employees access these applications for uploading live production videos.

Recently there are complaints of high latency while accessing these applications from employees.

The company has decided to set up AWS Local Zones within on-premises data centers to mitigate the latency issue.

Project Team deploying AWS Local zones is concerned about the IP address to be used for new EC2 instances in AWS Local Zones. Which of the following can be recommended for IP address assignment for EC2 instances in AWS Local Zones?

Answers

Explanations

Click on the arrows to vote for the correct answer

A. B. C. D.

Correct Answer - B.

For creating AWS Local Zone, it needs to be enabled in a region & not globally.While creating a subnet in AWS Local Zones, subnets from parent VPC are extended to these AWS Local Zones.

Option A is incorrect as a new subnet needs to be created from existing VPC & not existing subnet can be extended to AWS Local Zones.

Option C is incorrect as the new subnet in the existing VPC needs to be allocated to AWS Local Zones before being used.

Option D is incorrect as Local Zones need to be enabled in the us-west-1 region & not globally.

For more information on AWS Local Zones, refer to the following URL.

https://aws.amazon.com/blogs/compute/low-latency-computing-with-aws-local-zones-part-1/

Sure, I'd be happy to provide a detailed explanation of the answer choices for this question.

First, let's review some important concepts related to AWS Local Zones and networking:

  • AWS Local Zones are a type of AWS infrastructure deployment that brings select AWS services closer to end-users and applications located in metropolitan areas. Local Zones are designed to provide low-latency access to services, reducing the time required to transmit data between applications and services deployed in the cloud and those running on-premises or in nearby data centers.
  • AWS Local Zones are deployed independently of the parent region, but they are still part of the same overall infrastructure. This means that Local Zones can use resources and services provided by the parent region, but they also have their own set of resources and services that are localized to the specific geographic area.
  • To connect to resources and services deployed in AWS Local Zones, you must create a VPC (Virtual Private Cloud) in the parent region and associate it with the Local Zone. This allows you to extend your existing network infrastructure to the Local Zone and provide access to resources and services from on-premises or other locations.
  • Subnets are a logical subdivision of a VPC's IP address range that you can use to isolate and secure resources within a VPC. Subnets are associated with availability zones (AZs) in the parent region, and they can be used to deploy resources such as EC2 instances, RDS instances, and Elastic Load Balancers (ELBs).

Now let's review the answer choices and evaluate each one based on the given scenario:

A. Enable Local Zone in us-west-1 region. Extend existing subnet from VPC created in parent region to AWS Local Zones. Assign an IP address for an EC2 instance in AWS Local Zones from this subnet.

This answer suggests extending an existing subnet from the VPC created in the parent region to the Local Zone. While this is technically possible, it may not be the best approach in this scenario because the existing subnet may not have been designed to accommodate the specific requirements of the Local Zone. In addition, the IP addresses used in the parent region may not be optimized for the Local Zone, which could lead to performance issues.

B. Enable Local Zone in us-west-1 region. Create a new subnet from an existing VPC in the parent region. Assign this subnet to AWS Local Zones. Assign an IP address for an EC2 instance in AWS Local Zones from this subnet.

This answer suggests creating a new subnet from an existing VPC in the parent region and assigning it to the Local Zone. This approach is more appropriate than the previous answer because it allows you to create a subnet that is specifically designed for the Local Zone, using IP addresses that are optimized for performance in that geographic area.

C. Enable Local Zone globally. Create a new subnet from an existing VPC in the parent region. Assign an IP address for an EC2 instance in AWS Local Zones from this subnet.

This answer suggests enabling the Local Zone globally, which is not necessary in this scenario because the Local Zone is only needed in the us-west-1 region. In addition, this answer suggests using a subnet created from an existing VPC in the parent region, which may not be optimized for the Local Zone.

D. Enable Local Zone globally. Create a new subnet from an existing VPC in the parent region. Assign this subnet to AWS Local Zones. Assign an IP address for an EC2 instance in AWS Local Zones from this subnet.

This answer suggests creating a new subnet from an existing VPC in the parent region and assigning it to the Local Zone, which is the same as answer B. The only difference is that this answer suggests enabling the Local Zone globally, which is not necessary in this scenario.

Based on the above analysis, the best answer for this

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