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Designing for Elasticity

  • Jan 1, 2099
This chapter is from the book

This chapter is from the book

AWS Certified Solutions Architect - Associate (SAA-C01) Cert GuideAWS Certified Solutions Architect - Associate (SAA-C01) Cert Guide

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This chapter is from the book

This chapter is from the book

AWS Certified Solutions Architect - Associate (SAA-C01) Cert GuideAWS Certified Solutions Architect - Associate (SAA-C01) Cert Guide

Learn More Buy

This chapter covers the following subjects:

  • Elastic Load Balancing: The capability of your AWS infrastructure to dynamically share traffic among multiple resources (such as EC2 instances) hinges on the ELB feature. This section discusses Elastic Load Balancing in detail.

  • Auto Scaling: To provide elasticity, you can have the number of EC2 instances increase or decrease based on several factors. This section describes Auto Scaling in great detail.

We discussed elasticity briefly when we presented the various advantages that cloud technologies provide IT solutions in Chapter 1, “The Fundamentals of AWS.” Remember, elasticity refers to the capability of your resources to scale up and down as well as in and out when resource requirements change due to changes in demand.

“Do I Know This Already?” Quiz

The “Do I Know This Already?” quiz allows you to assess whether you should read the entire chapter. Table 9-1 lists the major headings in this chapter and the “Do I Know This Already?” quiz questions covering the material in those headings so you can assess your knowledge of these specific areas. The answers to the “Do I Know This Already?” quiz appear in Appendix A.

Table 9-1 “Do I Know This Already?” Foundation Topics Section-to-Question Mapping

Foundation Topics Section

Question

Elastic Load Balancing

1–2

Auto Scaling

3–4

CAUTION

The goal of self-assessment is to gauge your mastery of the topics in this chapter. If you do not know the answer to a question or are only partially sure of the answer, you should mark that question as wrong for purposes of the self-assessment. Giving yourself credit for an answer you correctly guess skews your self-assessment results and might provide you with a false sense of security.

  1. Which is not a common service used with ELB?

    1. EC2

    2. CloudWatch

    3. EBS

    4. Route 53

  2. Which of the following is not a valid type of Elastic Load Balancer in AWS?

    1. Classic

    2. Service-based

    3. Network

    4. Application

  3. How many Auto Scaling policies can you set against an AWS resource?

    1. 1

    2. 10

    3. 50

    4. 100

  4. What is the cooldown period used with Auto Scaling?

    1. It is the mandatory time that a service must run before sampling can begin.

    2. It is the mandatory sample time of metrics for policy-based Auto Scaling.

    3. It is the mandatory time that Auto Scaling must wait after a service reboots before scale-out operations.

    4. It is the mandatory time that Auto Scaling must wait before it takes additional scaling actions.

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