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NEW QUESTION: 1
What are two benefits of protecting and enhancing the image of the Help Desk? (Choose two)
A. timely call avoidance
B. improved employee morale
C. reduced resolution rates
D. potential business growth
Answer: B,D
NEW QUESTION: 2
Refer to the exhibit. Given that class A realizes interfaces X and Y, and that class B realizes interface Y and uses interface Z, what operations must class A support?
A. intersection of the operations in interfaces X, Y, and Z
B. union of the operations in interfaces X and Y
C. union of the operations in interfaces X, Y, and Z
D. not required to support any operations specified by the interfaces shown
E. intersection of the operations in interfaces X and Y
Answer: B
NEW QUESTION: 3
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 for the EC2 instances in the target groups behind the ALB to deny the malicious IP address
B. Modify the configuration of AWS WAF to add an IP match condition to block the malicious IP address
C. Modify the security groups for the EC2 instances in the target groups behind the ALB to deny the malicious IP address
D. Modify the network ACL on the CloudFront distribution to add a deny rule for the malicious IP address
Answer: B
Explanation:
Reference:
https://aws.amazon.com/blogs/aws/aws-web-application-firewall-waf-for-application-loadbalancers/
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/