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Exam AWS-SysOps topic 1 question 835 discussion

Exam question from Amazon's AWS-SysOps
Question #: 835
Topic #: 1
[All AWS-SysOps Questions]

A SysOps Administrator is maintaining an application that runs on Amazon EC2 instances behind an Application Load Balancer (ALB). Users are reporting errors when attempting to launch the application. The Administrator notices an increase in the HTTPCode_ELB_5xx_Count Amazon CloudWatch metric for the load balancer.
What is a possible cause for this increase?

  • A. The ALB is associated with private subnets within the VPC.
  • B. The ALB received a request from a client, but the client closed the connection.
  • C. The ALB security group is not configured to allow inbound traffic from the users.
  • D. The ALB target group does not contain healthy EC2 instances.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
Reference:
https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-cloudwatch-metrics.html
by nicat at May 11, 2020, 10:30 p.m.
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nicat
Highly Voted 3 years ago
D. The ALB target group does not contain healthy EC2 instances.
upvoted 7 times
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tharuroxz
Most Recent 8 months, 2 weeks ago
Selected Answer: D
D should be the answer, to receive 5XX errors
upvoted 1 times
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albert_kuo
1 year, 3 months ago
Selected Answer: B
Option B is the most likely cause for the increase in the HTTPCode_ELB_5xx_Count metric. The ALB received a request from a client, but the client closed the connection before the request could be fulfilled by the backend instances. This could happen if there are issues with the backend instances, such as high load, application errors, or other issues causing the instances to return errors.
upvoted 1 times
albert_kuo
12 months ago
Change to D https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-cloudwatch-metrics.html
upvoted 1 times
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Zoroter
1 year, 9 months ago
Why are we sure C is wrong? Wouldn't lack of allow rules on security group cause connection timeout (5xx error)? It's inbound, so it won't pass the traffic until it originates from EC2 instances (outbound traffic, stateful rule if outbound is allowed).
upvoted 1 times
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RicardoD
2 years, 11 months ago
D is the answer
upvoted 1 times
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abhishek_m_86
3 years ago
D. The ALB target group does not contain healthy EC2 instances. As 5XX are server side issues
upvoted 2 times
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jackdryan
3 years ago
I'll go with D
upvoted 1 times
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a_w_s
3 years ago
D : 5XX code correspond to server side issue... So the ALB target group does not contain healthy EC2 instances..
upvoted 4 times
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Community vote distribution
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C (25%)
B (20%)
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