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Question 106 - SAP-C01 discussion

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A company has a standard three-tier architecture using two Availability Zones. During the company’s off season, users report that the website is not working. The Solutions Architect finds that no changes have been made to the environment recently, the website is reachable, and it is possible to log in. However, when the Solutions Architect selects the “find a store near you” function, the maps provided on the site by a third-party RESTful API call do not work about 50% of the time after refreshing the page. The outbound API calls are made through Amazon EC2 NAT instances.

What is the MOST likely reason for this failure and how can it be mitigated in the future?

A.
The network ACL for one subnet is blocking outbound web traffic. Open the network ACL and prevent administration from making future changes through IAM.
Answers
A.
The network ACL for one subnet is blocking outbound web traffic. Open the network ACL and prevent administration from making future changes through IAM.
B.
The fault is in the third-party environment. Contact the third party that provides the maps and request a fix that will provide better uptime.
Answers
B.
The fault is in the third-party environment. Contact the third party that provides the maps and request a fix that will provide better uptime.
C.
One NAT instance has become overloaded. Replace both EC2 NAT instances with a larger-sized instance and make sure to account for growth when making the new instance size.
Answers
C.
One NAT instance has become overloaded. Replace both EC2 NAT instances with a larger-sized instance and make sure to account for growth when making the new instance size.
D.
One of the NAT instances failed. Recommend replacing the EC2 NAT instances with a NAT gateway.
Answers
D.
One of the NAT instances failed. Recommend replacing the EC2 NAT instances with a NAT gateway.
Suggested answer: D

Explanation:

The issue is 50% failure, means the balancing over 2 AZs is failing on one NAT instance in one AZ. The solution is to replace the NAT instance with fully managed and high available NAT gateway.

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asked 16/09/2024
Federico Miliacca
33 questions
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