I'm just starting my networking journey and I'm confused.
If I have an network range of 172.19.254.0 /27, when I enter it into a router I get a subnet mask of 255.255.255.0. I thought 172 was a class B which would be a 255.255.0.0. Does the /27 dictate subnet mask rather than class? I also get more than 30 IP's in the pool. Thank you in advance for your time.
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