Q4 — AWS SAA-C03 Ch.12

Question 4 of 100 | ← Chapter 12

Q804. A company is designing a new web service that will run on Amazon EC2 instances behind an Elastic Load Balancing (ELB) load balancer. However, many of the web service clients can only reach IP addresses authorized on their firewalls.What should a solutions architect recommend to meet the clients?needs?

• A. A Network Load Balancer with an associated Elastic IP address. ✓
• B. An Application Load Balancer with an associated Elastic IP address.
• C. An A record in an Amazon Route 53 hosted zone pointing to an Elastic IP address.
• D. An EC2 instance with a public IP address running as a proxy in front of the load balancer.

Correct Answer: A. A Network Load Balancer with an associated Elastic IP address.

Explanation

B -> Application Load Balancer cannot be assigned an Elastic IP address (static IP address).C -> Its DNS after all, "Associated elastic IP" is what IP? Makes no senseD -> "If you require a persistent public IP address that can be associated to and from instances as you require, use an Elastic IP address instead." PUBLIC IP of an EC2 is not persistent, although we can give an Elastic Ip, Using EC2 in front of a Load Balancer is tooooo much. What if it gets a million request? So to scale that EC2 you use another LB and an ASG>? This makes no senseA is correct because a NLB can have an elastic IP and we can use this in our firewall as per the use case