Hi. I'm studying for my Net+ exam and am covering Subnetting at the moment. I'm struggling to understand a concept in Variable Length Subnet Masking. Let's see if I can put together an example that illustrates it.
I am using x.x.32.0 /26. Using a bit size of 64 to find my different subnets I get: * x.x.32.64 * x.x.32.128 * x.x.32.192 * x.x.33.0 * x.x.33.64
so on and so forth. How does the computer know when to stop creating subnets? I didn't tell it that I need 5 or 6 or 100 subnets (I'm assuming we would just keep adding 64 100 times until we got all of them). I ask because in the example problem that I am working through in VLSM our next subnet has a mask of /27 which is x.x.33.128 /27. This is the very next subnet in the /26 network. How can that IP belong to both a /26 and a /27 network at the same time?
Ultimately, when incrementing the IP(subnet) addresses 128, 64, 32, 16, 8, 4, 2, or 1 every time you need a new subnet there is going to be overlap. How does the computer come to terms with this internally?
This is all vendor neutral, we aren't looking on a Cisco router or any other type. We haven't even done commands to execute this yet.
No comments:
Post a Comment