Compute - What is an AWS Elastic Load Balancer (ELB)?

Question 1

What is the main function of an Elastic Load Balancer (ELB)?

Answer 1

• Distributes inbound requests evenly across a group of targets
• Manages and controls the flow of incoming traffic

Question 2

What are the targets that can be used with an ELB?

Answer 2

• EC2 instances
• Lambda functions
• IP addresses
• Containers

Question 3

Why should an Elastic Load Balancer be introduced into an architecture?

Answer 3

• Enhances infrastructure resilience
• Helps handle unpredictable traffic spikes
• Improves high availability

Question 4

What are the advantages of using an AWS ELB?

Answer 4

• Managed by AWS
• Automatically scales to meet incoming traffic
• Enables dynamic scaling

Question 5

What are the three types of ELBs available in AWS?

Answer 5

• Application Load Balancer
• Network Load Balancer
• Classic Load Balancer

Question 6

What is a listener in the context of an ELB?

Answer 6

• Configures how inbound connections are routed to target groups
• Defines ports and protocols for routing conditions

Question 7

What is a target group in relation to an ELB?

Answer 7

• A group of resources that the ELB routes requests to
• Can be associated with different listener configurations

Question 8

What are rules associated with in an ELB?

Answer 8

• Each listener in the ELB
• Help define how incoming requests are routed to target groups

Question 9

What is the purpose of health checks in an ELB?

Answer 9

• Determines the health of resources in the target group
• Marks unhealthy targets and stops sending traffic to them

Question 10

What are the two schemes for ELBs?

Answer 10

• Internet-facing ELB
• Internal ELB

Question 11

What is the function of ELB nodes?

Answer 11

• Distribute traffic to target groups
• Placed in each Availability Zone selected for the ELB

Question 12

What is Cross-Zone load balancing?

Answer 12

• An option to evenly distribute traffic between targets across multiple Availability Zones

Question 13

How does an Internet-facing ELB communicate with its target group?

Answer 13

Uses the internal IP address of the target group

Question 14

What does an internal ELB require to serve requests?

Answer 14

Requests must originate from within the VPC

Question 15

What is the role of server certificates with load balancers?

Answer 15

Help terminate encrypted requests