Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 93 discussion

option A prefix length is too long (/29) option B and D cannot be associated with CIDR block from range 172.16.0.0/12 due to cidr block restrictions. it leaves option C as the feasible option.

This question has two correct answers : B and D. You can only add non overlapping CIDR as additional cidr.

B is the correct answer. If you're adding a CIDR Block to the VPC you can't have overlap with the existing VPC CIDR. C would overlap adding that block and actually can't be done as mentioned by evargasbrz. The correct answer is B

C. 172.17.0.0/16 Explanation: The current VPC has a CIDR block of 172.16.0.0/16, which falls within the 172.16.0.0/12 range. According to AWS documentation, you can add additional CIDR blocks from the 172.16.0.0/12 range (which includes 172.16.0.0/16 to 172.31.0.0/16), provided they do not overlap with the existing CIDR block. 172.17.0.0/16 is a valid CIDR block within the 172.16.0.0/12 range, and it does not overlap with the existing 172.16.0.0/16 CIDR block. Option A (172.17.0.0/29) and Option B (10.0.0.0/16) are also valid CIDR blocks, but the /29 block would provide too few IP addresses, and Option B is from a different RFC 1918 range, which is not the most straightforward choice for expanding within the same address space.

I think that it's correct answer is C according to SPOTO products.

B -> is the right answer here. Guys, you are not able to add any one of the following CIDRs A. 172.17.0.0/29 C. 172.17.0.0/16 D. 192.168.0.0/16

Option C

The correct answer is C

The correct answer is C

The correct answer is C

https://docs.aws.amazon.com/vpc/latest/userguide/vpc-cidr-blocks.html#add-cidr-block-restrictions Only it will also us to add 172.17.0.0/16