Public IP address quiz · Level 0

Question 1Todo.io stopped and started its web server overnight. Now users can't reach it at the public IP address they had. What happened?

A normal public IP is released when an instance stops; it got a new one on start. An Elastic IP stays fixed.Correct. Inside the VPC the instance only knows its private IP. The public IP is mapped to it, and that mapping changes on stop and start.The security group was reset.Not this one. Security groups don't change when an instance stops.The subnet became private.Not this one. A subnet only changes if someone edits its route table.The internet gateway was removed.Not this one. Stopping an instance doesn't touch the gateway.

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Question 2What does "Public IP address" mean?

An address the whole internet can reach.Correct. Think of it as: A street address printed on the outside of the building.The VPC's door to the public internet.Not this one. That describes Internet gateway.A firewall attached to a network card, listing what traffic is allowed in and out.Not this one. That describes Security group.A slice of a VPC's addresses that lives in one Availability Zone.Not this one. That describes Subnet.

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Question 3Which term is this? "An address the whole internet can reach."

Public IP addressCorrect. Yes. Think of it as: A street address printed on the outside of the building.Internet gatewayNot this one. Internet gateway is: The VPC's door to the public internet.Security groupNot this one. Security group is: A firewall attached to a network card, listing what traffic is allowed in and out.SubnetNot this one. Subnet is: A slice of a VPC's addresses that lives in one Availability Zone.

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Question 4Which AWS term is described by this analogy? "A street address printed on the outside of the building."

Public IP addressCorrect. Yes: An address the whole internet can reach.Internet gatewayNot this one. Internet gateway is: The VPC's door to the public internet. Its analogy: The estate's front gate.Security groupNot this one. Security group is: A firewall attached to a network card, listing what traffic is allowed in and out. Its analogy: A bouncer standing at one particular door, holding a guest list.SubnetNot this one. Subnet is: A slice of a VPC's addresses that lives in one Availability Zone. Its analogy: One street on the estate.

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