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Exam 1z0-997-20 topic 1 question 23 discussion

Actual exam question from Oracle's 1z0-997-20
Question #: 23
Topic #: 1
[All 1z0-997-20 Questions]

A retail company runs their online shopping platform entirely on Oracle Cloud Infrastructure (OCI). This is a 3-tier web application that includes a 100 Mbps Load
Balancer, Virtual Machine Instances for web and application tiers, and an Oracle DB Systems Virtual Machine. Due to unprecedented growth, they noticed an increase in the incoming traffic to their website and all users start getting 503 (Service Unavailable) errors.
What is the potential problem in this scenario? (Choose the best answer.)

  • A. You did not configure a Service Gateway to allow connection between web servers and Load Balancer.
  • B. The Traffic Management Policy is not set to Load Balancer the traffic to the web servers.
  • C. The Load Balancer health check status indicates critical situation for half of the backend web servers.
  • D. The Database is down hence users cannot access the web site.
  • E. All the web servers are too busy and not able to answer any request from users.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by nwongsf at Nov. 12, 2020, 7:13 a.m.

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fhoyos
Highly Voted 3 years, 5 months ago
Answer is E: A 503 Service Unavailable Error is an HTTP response status code indicating that a server is temporarily unable to handle the request. This may be due to the server being overloaded or down for maintenance.
upvoted 10 times
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Attaxhan
Most Recent 2 years, 1 month ago
in today exam
upvoted 1 times
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serivn
2 years, 2 months ago
Correct answer is E. A is wrong totally. B is wrong as well because this is just happen in the peak time. C means just a half of backend servers is in critical situation means still have a half to serve the request. D is wrong because if database is down, you will see a total different kind of error (500 for example) but this is 503 mean the request has not been served.
upvoted 1 times
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666Amitava666
2 years, 3 months ago
Selected Answer: E
E. All the web servers are too busy and not able to answer any request from users. The server must be overloaded or down for maintenance.
upvoted 1 times
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Desong
2 years, 4 months ago
E for sure
upvoted 2 times
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marvelt
2 years, 8 months ago
E is most probable in this case. D also could be a reason.
upvoted 2 times
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Rohit_B
3 years, 3 months ago
Answer is E.
upvoted 2 times
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ankit89
3 years, 4 months ago
B is not right, because this is not DNS traffic problem.
upvoted 1 times
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ankit89
3 years, 4 months ago
Answer E: 503 is an error, comes when server being overloaded. Read https://medium.com/tensult/troubleshooting-http-503-errors-returned-when-using-a-classic-load-balancer-c11d58da3595#:~:text=The%20most%20common%20reason%20for,instances%20are%20failing%20health%20checks.
upvoted 2 times
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yanqingdong
3 years, 4 months ago
why not B?
upvoted 1 times
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nwongsf
3 years, 5 months ago
should be B
upvoted 1 times
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