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Question 258 - SAP-C01 discussion

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A user has created a VPC with public and private subnets using the VPC Wizard. The VPC has CIDR 20.0.0.0/16. The private subnet uses CIDR 20.0.0.0/24.

Which of the below mentioned entries are required in the main route table to allow the instances in VPC to communicate with each other?

A.
Destination : 20.0.0.0/0 and Target : ALL
Answers
A.
Destination : 20.0.0.0/0 and Target : ALL
B.
Destination : 20.0.0.0/16 and Target : Local
Answers
B.
Destination : 20.0.0.0/16 and Target : Local
C.
Destination : 20.0.0.0/24 and Target : Local
Answers
C.
Destination : 20.0.0.0/24 and Target : Local
D.
Destination : 20.0.0.0/16 and Target : ALL
Answers
D.
Destination : 20.0.0.0/16 and Target : ALL
Suggested answer: B

Explanation:

A user can create a subnet with VPC and launch instances inside that subnet. If the user has created a public private subnet, the instances in the public subnet can receive inbound traffic directly from the Internet, whereas the instances in the private subnet cannot. If these subnets are created with Wizard, AWS will create two route tables and attach to the subnets. The main route table will have the entry "Destination: 20.0.0.0/16 and Target: Local", which allows all instances in the VPC to communicate with each other.

Reference: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Scenario2.html

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asked 16/09/2024
James Joiner
31 questions
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