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Question 70 - SAA-C03 discussion

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A company's HTTP application is behind a Network Load Balancer (NLB). The NLB's target group isconfigured to use an Amazon EC2 Auto Scaling group with multiple EC2 instances that run the webservice. The company notices that the NLB is not detecting HTTP errors for the application. These errorsrequire a manual restart of the EC2 instances that run the web service. The company needs toimprove the application's availability without writing custom scripts or code.

What should a solutions architect do to meet these requirements?

A.
Enable HTTP health checks on the NLB. supplying the URL of the company's application.
Answers
A.
Enable HTTP health checks on the NLB. supplying the URL of the company's application.
B.
Add a cron job to the EC2 instances to check the local application's logs once each minute. If HTTPerrors are detected, the application will restart.
Answers
B.
Add a cron job to the EC2 instances to check the local application's logs once each minute. If HTTPerrors are detected, the application will restart.
C.
Replace the NLB with an Application Load Balancer. Enable HTTP health checks by supplying theURL of the company's application. Configure an Auto Scaling action to replace unhealthy instances.
Answers
C.
Replace the NLB with an Application Load Balancer. Enable HTTP health checks by supplying theURL of the company's application. Configure an Auto Scaling action to replace unhealthy instances.
D.
Create an Amazon Cloud Watch alarm that monitors the UnhealthyHostCount metric for the NLB.Configure an Auto Scaling action to replace unhealthy instances when the alarm is in the ALARM state.
Answers
D.
Create an Amazon Cloud Watch alarm that monitors the UnhealthyHostCount metric for the NLB.Configure an Auto Scaling action to replace unhealthy instances when the alarm is in the ALARM state.
Suggested answer: C

Explanation:

Application availability: NLB cannot assure the availability of the application. This is because it bases its decisions solely on network and TCP-layer variables and has no awareness of the application at all.Generally, NLB determines availability based on the ability of a server to respond to ICMP ping or to correctly complete the three-way TCP handshake. ALB goes much deeper and is capable of determining availability based on not only a successful HTTP GET of a particular page but also the verification that the content is as was expected based on the input parameters.


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asked 16/09/2024
Anthony Steele
42 questions
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