VLSM offers the ability to use different subnet masks on the same network.
As seen in the VLSM exhibit (portion of netowrk shown) we have three routers with each using a 30 bit subnet mask between the serial ports which would be appropriate on our network to conserve IPv4 addresses on those networks.
Each router is connected to a switch with each of the switches accomedating a different subnet mask as appropriate per the department for the required number of clients.
Keep in mind that a network design like this will require the use of a protocol that will support VLSM, and the use of a
Summary Route and all routing protocols will not.
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