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Exam AWS-SysOps topic 1 question 891 discussion

Exam question from Amazon's AWS-SysOps
Question #: 891
Topic #: 1
[All AWS-SysOps Questions]

A company is migrating its exchange server from its on-premises location to a VPC in the AWS Cloud. Users working from home connect using a secure, encrypted channel over the internet to the exchange server. However, after the migration to AWS, users are having trouble receiving email.
The VPC flow log records display the following.

What is the root cause of the problem?

  • A. SMTP traffic from the network interface was blocked by an outbound network ACL.
  • B. SMTP traffic from the network interface was blocked by an outbound security group.
  • C. SMTP traffic to the network interface was blocked by an inbound network ACL.
  • D. SMTP traffic to the network interface was blocked by an inbound security group.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by Drey at May 2, 2021, 1:25 p.m.
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gulu73
8 months, 4 weeks ago
Selected Answer: A
A is the answer
upvoted 1 times
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random_007
2 years ago
answer A
upvoted 2 times
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TroyMcLure
2 years ago
Correct Answer: A The returning traffic (from the instance to the user's IP) was blocked by the outbound NACL.
upvoted 2 times
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RicardoD
2 years ago
A is the answer
upvoted 2 times
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bobanBBB
2 years ago
How do we know which IP is for the server and which one of the user?
upvoted 1 times
Rijndael
2 years ago
youre supposed to know how to read that log, which field is which value.... I dont... but were supposed to
upvoted 1 times
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chewingice
2 years ago
<src ip> <dest ip> <src port> <dest port>
upvoted 1 times
...
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krishna2812
2 years ago
A should be the answer
upvoted 1 times
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Drey
2 years ago
I think NACL blocked traffic from 172.25.11.22 port 25 to the users' IP. A?
upvoted 3 times
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C (25%)
B (20%)
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