Very new to networking and have been reading up quite a bit. Something that I am curious about is if I am given a /25 to put a network on and I want 4 ip addresses set aside as gateways for certain equipment how would that work out. Does that /25 turn into a /26 and a /30?
You are correct. The /25 will become two /26 subnets. In one of them, you can further subnet to extract a /30 subnet.
Example: If we had 10.10.10.128/25 subnet, we could do 10.10.10.128/26 as one subnet 10.10.10.192/26 being the other /26 subnet. Out of .192 subnet, we could derive 10.10.10.192/30 as a /30 subnet. In this case, you will be left with few more possible subnets (.224/27, 208/28 and so on).
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