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NEW QUESTION 23
A company's website is used to sell products to the public The site runs on Amazon EC2 instances in an Auto Scaling group behind an Application Load Balancer (ALB) There is also an Amazon CloudFront distribution and AWS WAF is being used to protect against SQL injection attacks The ALB is the origin for the CloudFront distribution A recent review of security logs revealed an external malicious IP that needs to be blocked from accessing the website What should a solutions architect do to protect the application?
- A. Modify the network ACL on the CloudFront distribution to add a deny rule for the malicious IP address
- B. Modify the security groups for the EC2 instances in the target groups behind the ALB to deny the malicious IP address
- C. Modify the network ACL for the EC2 instances in the target groups behind the ALB to deny the malicious IP address
- D. Modify the configuration of AWS WAF to add an IP match condition to block the malicious IP address
Answer: D
Explanation:
Reference:
https://docs.aws.amazon.com/waf/latest/developerguide/classic-web-acl-ip-conditions.html A new version of the AWS Web Application Firewall was released in November 2019. With AWS WAF classic you create "IP match conditions", whereas with AWS WAF (new version) you create "IP set match statements". Look out for wording on the exam.
The IP match condition / IP set match statement inspects the IP address of a web request's origin against a set of IP addresses and address ranges. Use this to allow or block web requests based on the IP addresses that the requests originate from.
AWS WAF supports all IPv4 and IPv6 address ranges. An IP set can hold up to 10,000 IP addresses or IP address ranges to check.
CORRECT: "Modify the configuration of AWS WAF to add an IP match condition to block the malicious IP address" is the correct answer.
INCORRECT: "Modify the network ACL on the CloudFront distribution to add a deny rule for the malicious IP address" is incorrect as CloudFront does not sit within a subnet so network ACLs do not apply to it.
INCORRECT: "Modify the network ACL for the EC2 instances in the target groups behind the ALB to deny the malicious IP address" is incorrect as the source IP addresses of the data in the EC2 instances' subnets will be the ELB IP addresses.
INCORRECT: "Modify the security groups for the EC2 instances in the target groups behind the ALB to deny the malicious IP address." is incorrect as you cannot create deny rules with security groups.
References:
https://docs.aws.amazon.com/waf/latest/developerguide/waf-rule-statement-type-ipset-match.html If you want to allow or block web requests based on the IP addresses that the requests originate from, create one or more IP match conditions. An IP match condition lists up to 10,000 IP addresses or IP address ranges that your requests originate from. Later in the process, when you create a web ACL, you specify whether to allow or block requests from those IP addresses.
AWS Web Application Firewall (WAF) - Helps to protect your web applications from common application-layer exploits that can affect availability or consume excessive resources. As you can see in my post (New - AWS WAF), WAF allows you to use access control lists (ACLs), rules, and conditions that define acceptable or unacceptable requests or IP addresses. You can selectively allow or deny access to specific parts of your web application and you can also guard against various SQL injection attacks. We launched WAF with support for Amazon CloudFront
https://docs.aws.amazon.com/waf/latest/developerguide/classic-web-acl-ip-conditions.html
https://aws.amazon.com/blogs/aws/aws-web-application-firewall-waf-for-application-load-balancers/
NEW QUESTION 24
A solutions architect is designing an application for a two-step order process The first step is synchronous and must return to the user with little latency The second step takes longer, so it will be implemented in a separate component Orders must be processed exactly once and in the order in which they are received
How should the solutions architect integrate these components?
- A. Use Amazon SQS FIFO queues.
- B. Create an SNS topic and subscribe an Amazon SQS FIFO queue to that topic
- C. Create an SNS topic and subscribe an Amazon SQS Standard queue to that topic.
- D. Use an AWS Lambda function along with Amazon SQS standard queues
Answer: B
Explanation:
Reference:
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/FIFOqueues.Html
NEW QUESTION 25
A product team is creating a new application that will store a large amount of data The data will be analyzed hourly and modified by multiple Amazon EC2 Linuxinstances The application team believes the amount of space needed will continue to grow for the next 6 months Which set of actions should a solutions architect take to support these needs'?
- A. Store the data in an Amazon EBS volume Mount the EBS volume onthe application instances
- B. Store the data in Amazon S3 Standard-Infrequent Access (S3 Standard-IA) Update the bucket policy to allow access to the application instances
- C. Store the data in Amazon S3 Glacier Update the vault policy to allow access to the application instances
- D. Store the data in an Amazon EFS file system Mount the file system on the application instances
Answer: D
Explanation:
Explanation
Amazon Elastic File System (Amazon EFS) provides a simple, scalable, fully managed elastic NFS file system for use withAWS Cloud services and on-premises resources. "It is built to scale on demand to petabytes without disrupting applications", "growing and shrinking automatically as you add and remove files", eliminating the need to provision and manage capacity to accommodate growth.
NEW QUESTION 26
A company is preparing to store confidential data in Amazon S3 For compliance reasons the data must be encrypted at rest Encryption key usage must be logged tor auditing purposes. Keys must be rotated every year.
Which solution meets these requirements and the MOST operationally efferent?
- A. Server-side encryption with Amazon S3 managed keys (SSE-S3)
- B. Server-side encryption with AWS KMS (SSE-KMS) customer master keys (CMKs) with automate rotation
- C. Server-side encryption with AWS KMS (SSE-KMS) customer master keys (CMKs) with manual rotation
- D. Server-side encryption with customer-provided keys (SSE-C)
Answer: B
Explanation:
https://docs.aws.amazon.com/kms/latest/developerguide/rotate-keys.html
When you enable automatic key rotation for a customer managed key, AWS KMS generates new cryptographic material for the KMS key every year. AWS KMS also saves the KMS key's older cryptographic material in perpetuity so it can be used to decrypt data that the KMS key encrypted.
Key rotation in AWS KMS is a cryptographic best practice that is designed to be transparent and easy to use. AWS KMS supports optional automatic key rotation only for customer managed CMKs. Enable and disable key rotation. Automatic key rotation is disabled by default on customer managed CMKs. When you enable (or re-enable) key rotation, AWS KMS automatically rotates the CMK 365 days after the enable date and every 365 days thereafter.
NEW QUESTION 27
A company is running a database on Amazon Aurora.
The database is idle every evening. An application that performs extensive reads on the database experiences performance issues during morning thus when user traffic spikes.
During these peak periods, the application receives timeout errors when reading from the database.
The company does not have a dedicated operations team and needs an automated solution to address the performance issues.
Which actions should a solutions architect take to automatically adjust to the increased read load on the database? (Select TWO )
- A. Migrate the database to an Amazon RDS for MySQL Multi-AZ deployment
- B. Configure Aurora Auto Scaling with Aurora Replicas
- C. Increase the instance size of the Aurora database
- D. Migrate the data ase to an Aurora multi-master cluster
- E. Migrate the database to Aurora Serverless.
Answer: B,E
NEW QUESTION 28
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