9281446
Description
Flashcards by Sarwesh Saurabh, updated more than 1 year ago
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Created by Sarwesh Saurabh
almost 7 years ago
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| Question | Answer |
| AWS: ELB 1:What best describes the purpose of an Elastic Load Balancer? An ELB is used BEST when it is distributing traffic to EC2 instances located in separate Availability Zones. This provides for higher availability and is more fault tolerant than distributing traffic to EC2 instances in the same AZ. | AWS:ELB 2: What are the two main components of AWS Auto Scaling? A launch configuration is an EC2 template that will be used by the Auto Scaling group. The Auto Scaling group holds the rules that govern when instances will be provisioned or terminated. |
| AWS:ELB 3: Elasticity is a primary benefit of using Auto Scaling. | AWS:ELB 4: If you want to create architecture that meets the minimum requirement for high availability and fault tolerance, which option would you choose? Having a minimum of two instances is required in case of them fails and is no longer "available." Two AZs are required in case of one of them fails and is no longer "available." Auto Scaling is required so that failed instance will be automatically terminated and replaced with healthy instance OR to increase the amount of instances if demand increases. (improving availability and fault tolerance). |
| AWS:ELB 5: What is the proper solution you should enact to prevent your application from crashing due to a sudden increase in demand? Auto Scaling is what provides your architecture with the ability to automate the process of adding more instances to avoid crashes (if the case of sudden increase in demand). Scaling polices are PART of Auto Scaling but are not the overall solution. | 6: True or False: If your application is continually crashing due to high demand, you should make sure the Elastic Load Balancer has the proper scaling polices for adding new instances whelse as n needed. False- It is Auto Scaling that contains scaling policies (which dictate the cloudwatch thresholds for adding/removing instances) Fa |
| 7: What best describes a scaling policy? Scaling policies belong to the Auto Scaling group. The policies themselves dictate (via chosen CloudWatch metrics thresholds) when instances should be added or removed. | 8: True or False: An ELB can serve traffic instances located inside a private subnet. True: Placing instances in a private subnet creates a higher level of security for the data stored on them. By using an ELB, the ELB can take public traffic from the open Internet and route into private subnets (and back out). |
| 9: What happens when an EC2 instance that is being served traffic from an ELB becomes unhealthy? The ELB will stop serving traffic to it and divert it's traffic to a healthy instance – as this is all it can do. It is Auto Scaling which can take an unhealthy instance, terminate it, and replace it with a new instance. | 10: True or False: An SSL certificate can be applied to an ELB. True - You can apply an SSL certificate to an ELB and have that as the central point for your secure connection before passing the traffics onto subsequent EC2 instances. |
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