Subnet Mask divides the IP address into two segments and informs the computer which part is the network bit and which one is the host bit. For example, if there is an IP address: 192.168.0.1, it will ...
I'm doing a lab in Boson, where it gives you the topology with some ip addresses and then expects you to do show running-config to get the subnet mask, and get the Network Address, First Host, Last ...