Private Address Ranges
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Class A 10.0.0.0 to 10.255.255.255
Class B 172.16.0.0 to 172.32.255.255
class C 192.168.0.0 to 192.168.255.255
So 172.28.0.0/16 in the range of Private IPs in Class B.
Answer is B.
This question is really badly worded, it's asking what type of address SHOULD you use if you're not connecting to the internet I.E. to save on IPv4 addresses. Therefore the only private address is correct.
This is surely the kind of question which one has to think further and try to predict what the intention behind it actually is. Surely, any network if working isolated from the internet can work with any IP addresses whether private or public. If you will connect this isolated network later to the Internet, if private you will need a NAT and if public (and not assigned to you) you will encounter problems. In any case you can have as well any public ip addresses behind a a NAT as long as the NAT will translate them to a valid public addresses (assigned to you). Unfortunately, poorly written questions are copied from one web site to another. I like about this site that they give the opportunity to vote and discuss the questions. I wonder if CISCO itself had cases of poor questions. Any cases or experiences reported?
ALL of the answers are correct for what this question ACTUALLY asks, however I believe what they are meaning to ask is which network belongs in the private address range and therefore CANNOT communicate across the internet. Therefore the answer is B. 172.28.0.0/16 which is the only private address range presented.
I agree with the 172.28 being a defined range in 1918, that does not mean the other addresses couldn't work I assure you. That question is not what is a valid 1918 range, the question is which would work if we didn't need public access and they all would.
this doesn't make sense to me and I cannot find anything when googling it, as far as I am aware any local network will work so unsure on why the answer is B?
172.28.0.0/16 is the only subnet part of the private address-range defined in RFC 1918. The private addresses are:
10.0.0.0/8
172.16.0.0/12
192.168.0.0/16
https://en.wikipedia.org/wiki/Private_network
Using a private address doesn’t mean The device “doesn’t need to access the internet “ - You can still use NAT. this question Is poorly written
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