Changing subnet masks when subnetting

Oh man! Ad-blocking software has been detected! :'(

This website is run by the community, for the community... and it needs advertisements in order to keep running. Blocking our ads means your killing our stats!
Please disable your ad-block, or become a premium member to hide all advertisements and this notice.

Do different subnets on the same network always need to have same subnet mask? Say you have two subnets that both have a /24 mask. If you need to expand the number of hosts on one subnet by so much that it will need a /23 mask but the other subnet does not need any additional hosts, do you still also need to change the other subnet's mask to /23? Are there any problems if you don't do this?

 

Oh man! Ad-blocking software has been detected! :'(

This website is run by the community, for the community... and it needs advertisements in order to keep running. Blocking our ads means your killing our stats!
Please disable your ad-block, or become a premium member to hide all advertisements and this notice.

No. This technic is called VLSM, Variable Lenght Subnet Masking. You just use the mask you need to support the users.