Hello. There’s a question with a bad answer on the Networking Quiz.
The question asks:
Which of these CIDR blocks and/or IP addresses are invalid for a private VPC or subnet on AWS? (Choose 2)
The possible answers are
A) 10.2.4.255
B) 172.31.4.2/15
C) 8.8.8.8
D) 192.168.1.2 with subnet mask 255.255.255.0
Technically B, C, and D are incorrect, but you were looking for B and D. Can you have 8.8.8.8 as a private IP address in AWS? I would think not.
1 Answers
Hi Davetbo,
Why not try it out… Go out to the VPC console and create a VPC using 8.0.0.0/16 CIDR. Then, if that works, create a subnet of 8.8.8.0/24. If that works, spin up an EC2 instances in that subnet and manually set the Primary IP to 8.8.8.8.
To really master this stuff, I recommend going out and trying stuff if you’re in doubt about something you see in a question.
–Scott