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Exam AWS-SysOps topic 1 question 523 discussion

Exam question from Amazon's AWS-SysOps
Question #: 523
Topic #: 1
[All AWS-SysOps Questions]

A Systems Administrator is planning to deploy multiple EC2 instances within two separate Availability Zones in the same AwS Region. The instances cannot be exposed to the Internet, but must be able to exchange traffic between one another. The data does not need to be encrypted.
What solution meets these requirements while maintaining the lowest cost?

  • A. Create two private subnets within the same VPC. Communicate between instances using their private IP addresses
  • B. Create 2 public subnets within the same VPC. Communicate between instances using their public IP addresses
  • C. Create 2 separate VPCs, one for each Availability Zone. Create a private subnet within each VPC. Create a static route table pointing the destination CIDR to the other VPC
  • D. Create 2 separate VPCs, one for each Availability Zone and create a public subnet in each. Deploy a VPN appliance within each VPC and establish a VPN tunnel between them. Communicate between instances by routing traffic through the VPN appliances
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by YashBindlish at July 14, 2019, 4:04 a.m.
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saumenP
Highly Voted 2 years, 7 months ago
A is correct
upvoted 11 times
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albert_kuo
Most Recent 10 months ago
Selected Answer: A
By creating private subnets, the instances will not have direct Internet access. They can communicate with each other using their private IP addresses within the VPC. This approach keeps the traffic within the VPC and does not incur any additional costs associated with public subnets, NAT gateways, or VPN connections.
upvoted 1 times
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gulu73
1 year, 2 months ago
Selected Answer: A
A is correct
upvoted 1 times
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m0h3n
2 years, 5 months ago
Ans:A But wording should include the 2 private subnets once each in different AZs.
upvoted 1 times
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TroyMcLure
2 years, 5 months ago
Correct Answer: A
upvoted 1 times
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kenkct
2 years, 6 months ago
Answer is A: All the instances launched in same VPC (irrespective of the subnet or AZ) will be associated with default security group. Default security group allow all traffic within it which enables all these instances to communicate with each other
upvoted 1 times
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a_w_s
2 years, 6 months ago
A: lowest cost!
upvoted 2 times
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a_w_s
2 years, 6 months ago
A: is the good answer!
upvoted 2 times
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anishmn10
2 years, 6 months ago
A is correct answer
upvoted 3 times
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ezat
2 years, 6 months ago
A cuz no encryption needed
upvoted 3 times
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sen12
2 years, 6 months ago
Important point here is COST effective, how come C or D be cost effective. With B not possible since they don't want the EC2 instance to be exposed to the outside world. Option A is left out which is cost effective with a simple VPC setup and 2 private subnets.
upvoted 2 times
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awsnoob
2 years, 6 months ago
Should be A
upvoted 3 times
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kkwang
2 years, 7 months ago
The correct answer is A
upvoted 4 times
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mukeshs
2 years, 7 months ago
Shouldnt the answer be A? All subnets within a VPC automatically talk to each other via the main route table.
upvoted 4 times
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YashBindlish
2 years, 7 months ago
Correct Answer is C
upvoted 2 times
karmaah
2 years, 6 months ago
No. Ans is A. Note that Private IPs can interact each other and not required any encryption
upvoted 6 times
ericphl
2 years, 6 months ago
Not agree, same VPC couldn't meet the request of "two separate AZ" So, A & B will be the correct answer. C is more lower cost than D. So C will be answer.
upvoted 1 times
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AWS_Noob
2 years, 6 months ago
Agreed. Perfect explanation
upvoted 1 times
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C (25%)
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