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Question 636 - SAA-C03 discussion

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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.
Answers
A.
A Network Load Balancer with an associated Elastic IP address.
B.
An Application Load Balancer with an associated Elastic IP address.
Answers
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.
Answers
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.
Answers
D.
An EC2 instance with a public IP address running as a proxy in front of the load balancer.
Suggested answer: A

Explanation:

A Network Load Balancer can be assigned one Elastic IP address for each Availability Zone it uses1. This allows the clients to reach the load balancer using a static IP address that can be authorized on their firewalls.An Application Load Balancer cannot be assigned an Elastic IP address2. An A record in an Amazon Route 53 hosted zone pointing to an Elastic IP address would not work because the load balancer would still use its own IP address as the source of the forwarded requests to the web service.An EC2 instance with a public IP address running as a proxy in front of the load balancer would add unnecessary complexity and cost, and would not provide the same scalability and availability as a Network Load Balancer.Reference:1: Network Load Balancers - Elastic Load Balancing3, IP address type section2: How to assign Elastic IP to Application Load Balancer in AWS?4, answer section.

asked 16/09/2024
Cesar Castillo
31 questions
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