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Exam AWS Certified Security - Specialty SCS-C02 All Questions

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Exam AWS Certified Security - Specialty SCS-C02 topic 1 question 135 discussion

Exam question from Amazon's AWS Certified Security - Specialty SCS-C02
Question #: 135
Topic #: 1
[All AWS Certified Security - Specialty SCS-C02 Questions]

Two Amazon EC2 instances in different subnets should be able to connect to each other but cannot. It has been confirmed that other hosts in the same subnets are able to communicate successfully, and that security groups have valid ALLOW rules in place to permit this traffic.

Which of the following troubleshooting steps should be performed?

  • A. Check inbound and outbound security groups, looking for DENY rules
  • B. Check inbound and outbound Network ACL rules, looking for DENY rules
  • C. Review the rejected packet reason codes in the VPC Flow Logs
  • D. Use AWS X-Ray to trace the end-to-end application flow
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Suggested Answer: B 🗳️
by Zek at May 13, 2024, 5:50 p.m.
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yismail
1 month, 1 week ago
Correct answer is C, other Instances in the same subnet can communicate, this eliminate the issue of NACL, if the deny role is attached the NACL on the same subnet, other Instances will not be able to communicate, only VPC flow logs can determine the error msg
upvoted 1 times
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navid1365
4 months, 1 week ago
Selected Answer: B
The answer is B. Here is the reason: 1) A cannot be correct since the questions explicitly mentions that SG are configured with correct rules 2) B is correct. NACLs are attached to a subnet and can have both ALLOW and DENY rules. Given that the other hosts in the two subnets can communicate successfully, there has to be an explicit DENY rule that denies access between the two hosts in question.
upvoted 1 times
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DeadDropLabs
6 months ago
Selected Answer: B
For C - While VPC Flow Logs can provide insights into why packets are being rejected, this is a more detailed troubleshooting step. Checking the NACL rules is a more direct approach to identifying potential network layer issues.
upvoted 4 times
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aescudero51
6 months, 2 weeks ago
Selected Answer: C
C is more relevant due to "It has been confirmed that other hosts in the same subnets are able to communicate successfully" where it says "other hosts in the same subnets" excluding NACL issue..
upvoted 2 times
helloworldabc
2 months, 3 weeks ago
just B
upvoted 1 times
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Certified101
6 months, 3 weeks ago
B - SG dont have deny rules
upvoted 3 times
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Zek
6 months, 4 weeks ago
Will go with B https://www.examtopics.com/discussions/amazon/view/30042-exam-aws-certified-security-specialty-topic-1-question-176/
upvoted 2 times
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