Exam AWS-SysOps topic 1 question 53 discussion

Exam question from Amazon's AWS-SysOps

Question #: 53
Topic #: 1

A customer has a web application that uses cookie Based sessions to track logged in users. It is deployed on AWS using ELB and Auto Scaling. The customer observes that when load increases. Auto Scaling launches new Instances but the load on the easting Instances does not decrease, causing all existing users have a sluggish experience.
Which two answer choices independently describe a behavior that could be the cause of the sluggish user experience? (Choose two.)

A. ELB's normal behavior sends requests from the same user to the same backend instance
B. ELB's behavior when sticky sessions are enabled causes ELB to send requests in the same session to the same backend instance
C. A faulty browser is not honoring the TTL of the ELB DNS name
D. The web application uses long polling such as comet or websockets. Thereby keeping a connection open to a web server tor a long time

Show Suggested Answer

Suggested Answer: BD 🗳️

by Subhro1295 at Feb. 20, 2020, 12:59 p.m.

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awscertified

Highly Voted 10 months, 2 weeks ago

B. ELB's behavior when sticky sessions are enabled causes ELB to send requests in the same session to the same backend instance D. The web application uses long polling such as comet or websockets. Thereby keeping a connection open

upvoted 6 times

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TroyMcLure

Most Recent 9 months, 2 weeks ago

Correct Answers: B & D

upvoted 1 times

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RicardoD

9 months, 3 weeks ago

B | D are the answers sticky sessions (B) can kill your ASG or even load balance. Unless you need it, it is better not to use. Also, long polling will keep users connected to the same machine (D)

upvoted 1 times

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teosinh

9 months, 4 weeks ago

BD are correct because - A is not true (ELB doesn't have that behavior if don't enable sticky session). - C is strange as well

upvoted 4 times

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SHoKMaSTeR

10 months ago

D. Full content is: "The web application uses long polling such as comet or WebSockets. Thereby keeping a connection open to a web server for a long time"

upvoted 3 times

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Me_ThatsWho

10 months, 2 weeks ago

A web application that uses long polling? Is SQS being used? Otherwise, I never heard that a web application would behave that way before. I understand that in using SQS, but there was mention that SQS was part of the process.

upvoted 2 times

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Subhro1295

11 months ago

What is the reason for selecting option D?

upvoted 1 times

gretch

10 months, 1 week ago

https://www.quora.com/Why-do-websockets-require-sticky-sessions?share=1

upvoted 2 times

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