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Exam AWS-SysOps topic 1 question 22 discussion

Exam question from Amazon's AWS-SysOps
Question #: 22
Topic #: 1
[All AWS-SysOps Questions]

You have two Elastic Compute Cloud (EC2) instances inside a Virtual Private Cloud (VPC) in the same Availability Zone (AZ) but in different subnets. One instance is running a database and the other instance an application that will interface with the database. You want to confirm that they can talk to each other for your application to work properly.
Which two things do we need to confirm in the VPC settings so that these EC2 instances can communicate inside the VPC? (Choose two.)

  • A. A network ACL that allows communication between the two subnets.
  • B. Both instances are the same instance class and using the same Key-pair.
  • C. That the default route is set to a NAT instance or internet Gateway (IGW) for them to communicate.
  • D. Security groups are set to allow the application host to talk to the database on the right port/protocol.
Show Suggested Answer Hide Answer
Suggested Answer: AD 🗳️
by pleasespammelater at Jan. 29, 2020, 6:15 p.m.
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KittieHearts
8 months, 3 weeks ago
Selected Answer: AD
AD When you think of communication from different vpc make sure they can communicate on a SG level and a NACL level, one is state full the other is stateless
upvoted 1 times
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Mornay
1 year, 11 months ago
"Which two things do we need to confirm in the VPC settings" - that would be A & C VPC Settings do not contain "Security Groups" this is done under EC2 settings.
upvoted 1 times
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TroyMcLure
3 years, 1 month ago
Correct Answers: A & D
upvoted 1 times
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FHU
3 years, 1 month ago
A & D are OK
upvoted 1 times
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RicardoD
3 years, 2 months ago
A | D are the answers a Default NACL would allow communication between Subnet, but you will have to check if the configuration is correct. Both SG should allow traffic between DB and application server
upvoted 1 times
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amitbbsr
3 years, 2 months ago
A,D- NACLstateless and security grp
upvoted 1 times
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awscertified
3 years, 2 months ago
A. A network ACL that allows communication between the two subnets. D. Security groups are set to allow the application host to talk to the database on the right port/protocol.
upvoted 3 times
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pleasespammelater
3 years, 3 months ago
Note that route tables automatically allow communication between subnets. But NACL's need to allow for that communication as well!
upvoted 4 times
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C (25%)
B (20%)
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