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NEW QUESTION 49
A solutions architect is developing a multiple-subnet VPC architecture. The solution will consist of six subnets in two Availability Zones. The subnets are defined as public, private and dedicated for databases. Only the Amazon EC2 instances running in the private subnets should be able to access a database.
Which solution meets these requirements?

• A. Create a security group that allows ingress from the security group used by instances in the private subnets. Attach the security group to an Amazon RDS DB instance.
• B. Create a now route table that excludes the route to the public subnets’ CIDR blocks. Associate the route table to the database subnets.
• C. Create a new peering connection between the public subnets and the private subnets. Create a different peering connection between the private subnets and the database subnets.
• D. Create a security group that denies ingress from the security group used by instances in the public subnets. Attach the security group to an Amazon RDS DB instance.

Answer: A

Explanation:
Security groups are stateful. All inbound traffic is blocked by default. If you create an inbound rule allowing traffic in, that traffic is automatically allowed back out again. You cannot block specific IP address using Security groups (instead use Network Access Control Lists).
“You can specify allow rules, but not deny rules.” “When you first create a security group, it has no inbound rules. Therefore, no inbound traffic originating from another host to your instance is allowed until you add inbound rules to the security group.” Source: https://docs.aws.amazon.com/vpc/latest/userguide/VPC_SecurityGroups.html#VPCSecurityGroups

NEW QUESTION 50
A tech company is running two production web servers hosted on Reserved EC2 instances with EBS-backed root volumes. These instances have a consistent CPU load of 90%. Traffic is being distributed to these instances by an Elastic Load Balancer. In addition, they also have Multi-AZ RDS MySQL databases for their production, test, and development environments.
What recommendation would you make to reduce cost in this AWS environment without affecting availability and performance of mission-critical systems? Choose the best answer.

• A. Consider using Spot instances instead of reserved EC2 instances
• B. Consider removing the Elastic Load Balancer
• C. Consider not using a Multi-AZ RDS deployment for the development and test database
• D. Consider using On-demand instances instead of Reserved EC2 instances

Answer: C

Explanation:
One thing that you should notice here is that the company is using Multi-AZ databases in all of their environments, including their development and test environment. This is costly and unnecessary as these two environments are not critical. It is better to use Multi-AZ for production environments to reduce costs, which is why the option that says: Consider not using a Multi-AZ RDS deployment for the development and test database is the correct answer.
The option that says: Consider using On-demand instances instead of Reserved EC2 instances is incorrect because selecting Reserved instances is cheaper than On-demand instances for long term usage due to the discounts offered when purchasing reserved instances.
The option that says: Consider using Spot instances instead of reserved EC2 instances is incorrect because the web servers are running in a production environment. Never use Spot instances for production level web servers unless you are sure that they are not that critical in your system. This is because your spot instances can be terminated once the maximum price goes over the maximum amount that you specified.
The option that says: Consider removing the Elastic Load Balancer is incorrect because the Elastic Load Balancer is crucial in maintaining the elasticity and reliability of your system. References:
https://aws.amazon.com/rds/details/multi-az/
https://aws.amazon.com/pricing/cost-optimization/
Amazon RDS Overview:
https://www.youtube.com/watch?v=aZmpLl8K1UU
Check out this Amazon RDS Cheat Sheet:
https://tutorialsdojo.com/amazon-relational-database-service-amazon-rds/

NEW QUESTION 51
As part of the Business Continuity Plan of your company, your IT Director instructed you to set up an automated backup of all of the EBS Volumes for your EC2 instances as soon as possible.
What is the fastest and most cost-effective solution to automatically back up all of your EBS Volumes?

• A. Use an EBS-cycle policy in Amazon S3 to automatically back up the EBS volumes.
• B. For an automated solution, create a scheduled job that calls the “create-snapshot” command via the AWS CLI to take a snapshot of production EBS volumes periodically.
• C. Use Amazon Data Lifecycle Manager (Amazon DLM) to automate the creation of EBS snapshots.
• D. Set your Amazon Storage Gateway with EBS volumes as the data source and store the backups in your on-premises servers through the storage gateway.

Answer: C

Explanation:
You can use Amazon Data Lifecycle Manager (Amazon DLM) to automate the creation, retention, and deletion of snapshots taken to back up your Amazon EBS volumes. Automating snapshot management helps you to:
– Protect valuable data by enforcing a regular backup schedule.
– Retain backups as required by auditors or internal compliance.
– Reduce storage costs by deleting outdated backups.
Combined with the monitoring features of Amazon CloudWatch Events and AWS CloudTrail, Amazon DLM provides a complete backup solution for EBS volumes at no additional cost.
Hence, using Amazon Data Lifecycle Manager (Amazon DLM) to automate the creation of EBS snapshots is the correct answer as it is the fastest and most cost-effective solution that provides an automated way of backing up your EBS volumes.
The option that says: For an automated solution, create a scheduled job that calls the “create-snapshot” command via the AWS CLI to take a snapshot of production EBS volumes periodically is incorrect because even though this is a valid solution, you would still need additional time to create a scheduled job that calls the “create-snapshot” command. It would be better to use Amazon Data Lifecycle Manager (Amazon DLM) instead as this provides you the fastest solution which enables you to automate the creation, retention, and deletion of the EBS snapshots without having to write custom shell scripts or creating scheduled jobs.
Setting your Amazon Storage Gateway with EBS volumes as the data source and storing the backups in your on-premises servers through the storage gateway is incorrect as the Amazon Storage Gateway is used only for creating a backup of data from your on-premises server and not from the Amazon Virtual Private Cloud.
Using an EBS-cycle policy in Amazon S3 to automatically back up the EBS volumes is incorrect as there is no such thing as EBS-cycle policy in Amazon S3.
References:
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/snapshot-lifecycle.html
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-creating-snapshot.html Check out this Amazon EBS Cheat Sheet:
https://tutorialsdojo.com/amazon-ebs/
Amazon EBS Overview – SSD vs HDD:
https://www.youtube.com/watch?v=LW7x8wyLFvw&t=8s

NEW QUESTION 52
A company has several unencrypted EBS snapshots in their VPC. The Solutions Architect must ensure that all of the new EBS volumes restored from the unencrypted snapshots are automatically encrypted.
What should be done to accomplish this requirement?

• A. Launch new EBS volumes and encrypt them using an asymmetric customer master key (CMK).
• B. Enable the EBS Encryption By Default feature for the AWS Region.
• C. Launch new EBS volumes and specify the symmetric customer master key (CMK) for encryption.
• D. Enable the EBS Encryption By Default feature for specific EBS volumes.

Answer: B

Explanation:
You can configure your AWS account to enforce the encryption of the new EBS volumes and snapshot copies that you create. For example, Amazon EBS encrypts the EBS volumes created when you launch an instance and the snapshots that you copy from an unencrypted snapshot.


Encryption by default has no effect on existing EBS volumes or snapshots. The following are important considerations in EBS encryption:
– Encryption by default is a Region-specific setting. If you enable it for a Region, you cannot disable it for individual volumes or snapshots in that Region.
– When you enable encryption by default, you can launch an instance only if the instance type supports EBS encryption.
– Amazon EBS does not support asymmetric CMKs.
When migrating servers using AWS Server Migration Service (SMS), do not turn on encryption by default. If encryption by default is already on and you are experiencing delta replication failures, turn off encryption by default. Instead, enable AMI encryption when you create the replication job.
You cannot change the CMK that is associated with an existing snapshot or encrypted volume. However, you can associate a different CMK during a snapshot copy operation so that the resulting copied snapshot is encrypted by the new CMK.
Although there is no direct way to encrypt an existing unencrypted volume or snapshot, you can encrypt them by creating either a volume or a snapshot. If you enabled encryption by default, Amazon EBS encrypts the resulting new volume or snapshot using your default key for EBS encryption. Even if you have not enabled encryption by default, you can enable encryption when you create an individual volume or snapshot. Whether you enable encryption by default or in individual creation operations, you can override the default key for EBS encryption and use symmetric customer-managed CMK. Hence, the correct answer is: Enable the EBS Encryption By Default feature for the AWS Region.
The option that says: Launch new EBS volumes and encrypt them using an asymmetric customer master key (CMK) is incorrect because Amazon EBS does not support asymmetric CMKs. To encrypt an EBS snapshot, you need to use symmetric CMK.
The option that says: Launch new EBS volumes and specify the symmetric customer master key (CMK) for encryption is incorrect. Although this solution will enable data encryption, this process is manual and can potentially cause some unencrypted EBS volumes to be launched. A better solution is to enable the EBS Encryption By Default feature. It is stated in the scenario that all of the new EBS volumes restored from the unencrypted snapshots must be automatically encrypted.
The option that says: Enable the EBS Encryption By Default feature for specific EBS volumes is incorrect because the Encryption By Default feature is a Region-specific setting and thus, you can’t enable it to selected EBS volumes only.
References:
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSEncryption.html#encryption-by-default
https://docs.aws.amazon.com/kms/latest/developerguide/services-ebs.html Check out this Amazon EBS Cheat Sheet:
https://tutorialsdojo.com/amazon-ebs/
Comparison of Amazon S3 vs Amazon EBS vs Amazon EFS:
https://tutorialsdojo.com/amazon-s3-vs-ebs-vs-efs/

NEW QUESTION 53
A local bank has an in-house application that handles sensitive financial data in a private subnet.
After the data is processed by the EC2 worker instances, they will be delivered to S3 for ingestion by other services.
How should you design this solution so that the data does not pass through the public Internet?

• A. Provision a NAT gateway in the private subnet with a corresponding route entry that directs the data to S3.
• B. Configure a VPC Endpoint along with a corresponding route entry that directs the data to S3.
• C. Configure a Transit gateway along with a corresponding route entry that directs the data to S3.
• D. Create an Internet gateway in the public subnet with a corresponding route entry that directs the data to S3.

Answer: B

Explanation:
The important concept that you have to understand in this scenario is that your VPC and your S3 bucket are located within the larger AWS network. However, the traffic coming from your VPC to your S3 bucket is traversing the public Internet by default. To better protect your data in transit, you can set up a VPC endpoint so the incoming traffic from your VPC will not pass through the public Internet, but instead through the private AWS network.
A VPC endpoint enables you to privately connect your VPC to supported AWS services and VPC endpoint services powered by PrivateLink without requiring an Internet gateway, NAT device, VPN connection, or AWS Direct Connect connection. Instances in your VPC do not require public IP addresses to communicate with resources in the service. Traffic between your VPC and the other services does not leave the Amazon network.
Endpoints are virtual devices. They are horizontally scaled, redundant, and highly available VPC components that allow communication between instances in your VPC and services without imposing availability risks or bandwidth constraints on your network traffic.


Hence, the correct answer is: Configure a VPC Endpoint along with a corresponding route entry that directs the data to S3.
The option that says: Create an Internet gateway in the public subnet with a corresponding route entry that directs the data to S3 is incorrect because the Internet gateway is used for instances in the public subnet to have accessibility to the Internet.
The option that says: Configure a Transit gateway along with a corresponding route entry that directs the data to S3 is incorrect because the Transit Gateway is used for interconnecting VPCs and on-premises networks through a central hub. Since Amazon S3 is outside of VPC, you still won’t be able to connect to it privately.
The option that says: Provision a NAT gateway in the private subnet with a corresponding route entry that directs the data to S3 is incorrect because NAT Gateway allows instances in the private subnet to gain access to the Internet, but not vice versa.
References:
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-endpoints.html
https://docs.aws.amazon.com/vpc/latest/userguide/vpce-gateway.html
Check out this Amazon VPC Cheat Sheet:
https://tutorialsdojo.com/amazon-vpc/

NEW QUESTION 54
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