C is correct
https://www.techtarget.com/whatis/definition/RFC-1918#:~:text=Along%20with%20NAT%20(network%20address,before%20the%20adoption%20of%20IPV6.
C. They are used with NAT to preserve public IPv4 addresses.
Explanation:
RFC 1918 defines private IP address ranges that are not routable on the public Internet. These addresses are commonly used within internal networks. To enable devices using private IP addresses to communicate with the public Internet, Network Address Translation (NAT) is used. NAT converts private IP addresses to public IP addresses when sending traffic to the Internet, thereby preserving the limited pool of public IPv4 addresses.
B&C are both technically correct. Having a LAN with private IP addresses scheme is common and does keep the network more secure and NAT is used with that to access outside networks. But what if I have a LAN like an Intranet where I need no outside access ? Just a BS question where both answers are very plausible since both are covered in RFC1918.
C is correct
By allowing many devices to share a small set of public IP addresses, the implementation of RFC1918 and NAT alleviated the pressure on the dwindling pool of globally unique IPv4 addresses.
https://netbeez.net/blog/rfc1918/
NAT alone preserves IPV4 addresses
RC 1918 alone preserves IPV4 addresses
I can't see how the two are connected or used together! That's why I am not picking C
RFC 1918, Page 8, No.6 says "Security issues are not addressed in this memo".
To name two main points being addressed in this memo, turn to Page 1, No.2, under Motivation; states that " One challenge is a concern within the community that globally unique address space will be exhausted." Secondly, it continues in Page 2 and states ," A separate and far more pressing concern is that the amount of routing overhead will grow beyond the capabilities of Internet Service Providers."
Besides, IPv4 private addresses are not routable. I do get why you would pick "protection against internet exposure" in this sense. There's now way in or out of the internet with these blocks without NAT.
However, using NAT Overload (aka PAT) or even Dynamic NAT, helps alleviate the said exhaustion problem by mapping private addresses to one inside global address.
"This document describes address allocation for private internets. The allocation permits full network layer connectivity among all hosts inside an enterprise as well as among all public hosts of different enterprises. The cost of using private internet address space is the potentially costly effort to renumber hosts and networks between public and private."
https://datatracker.ietf.org/doc/html/rfc1918
I think its actually B the RFC 1918 was published in 1996. RFC 2663 (NAT) was published in 1999. It is not clear in the RFC 1918 that it was developed with NAT in mind
Comment makes no sense it literally says it in the introduction.
"This document describes address allocation for private internets. The allocation permits full network layer connectivity among all hosts inside an enterprise as well as among all public hosts of different enterprises. The cost of using private internet address space is the potentially costly effort to renumber hosts and networks between public and private."
https://datatracker.ietf.org/doc/html/rfc1918
upvoted 2 times
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