Elastic Load Balancers (ELB)

Question 1

What is ELB, what does it stand for? What are the three types?

Answer 1

• ELB - Elastic Load Balancer
• Types
  
  • Application Load Balancer
  • Network Load Balancer
  • Classic Load Balancer

Question 2

What layer do Application Load Balancers Operate at? Which Protocols?

Answer 2

• HTTP/HTTPS
• Layer 7 - The Application Layer

Question 3

What are some general attributes of an application load balancer?

Answer 3

• General use
• Intelligent Load Balancer

Question 4

What is a load balancer health check? What are the possible values returned by a health check?

Answer 4

• Its the ability for the ELB to check EC2 instances to see if they’re up.
• inService
• outOfService

Question 5

How many rules can you create for an Application Load Balancer

Answer 5

• at least 1 - default

Question 6

What is an ALB Target Group

Answer 6

• A group of EC2 instances registered with the application load balancer

Question 7

What is path-based routing?

Answer 7

• When you use the URL path to make routing decisions

Question 8

What is required to use an HTTPS Listener on an application load balancer

Answer 8

• Must deploy one SSL or TLS certificate on the load balancer

Question 9

What layer do network balancers operate at? What protocols?

Answer 9

• Layer 4
• TCP, TLS, UDP, TCP_UDP

Question 10

1. What are sticky sessions?
2. Why might you use them?
3. How do you deal with a missing EC2 instance a person is bound to?

Answer 10

1. Binds a request to a particular EC2 instance
2. This is usually because of the requirements of an application
3. Disable sticky sessions

Question 11

How can you grant access to your ELB to clients that can only access trusted IP addresses?

Answer 11

you can use the Bring Your Own IP (BYOIP) feature to use the trusted IPs as Elastic IP addresses (EIP) to a Network Load Balancer (NLB

Question 12

How can you allow multiple domains to serve SSL traffic over the same IP address

Answer 12

Generate an SSL certificate with AWS Cert Manager

Associate the certificate with the the CloudFront web distribution

Enable SNI (server name indication), a TLS extension

Question 13

How would you analyze the logs from an application load balancer?

Answer 13

Store the logs in S3

Analyze with EMR

Question 14

Can an elastic load balancer run across regions?

Answer 14

no, it runs across AZs in a single region