MicroNugget: How to Select Subnet Sizes for VLANs

In this video, Jeremy Cioara covers how to determine the proper subnet size for VLANs. He begins by correlating VLANs with subnets, then discusses how to align these two concepts effectively. He’ll walk you through how to design and implement Switch VLANs in real-world settings.

Subnetting essentially means adjusting the bit boundary of the subnet mask that’s attached to every IP address. This lets you allocate how many bits are dedicated to networks and hosts, giving you the ability to create custom-sized networks for your environment.

In reality, there are really only five subnets you’ll commonly encounter: large client, medium client, small client, redundant WAN uplinks, and point-to-point WAN uplinks. While these all have their differences, the strategies you learn will enable you to effectively determine the proper subnet size in 98 percent of instances.

One of the core concepts Jeremy discusses is how VLANs and subnets interact with each other, regardless of subnet size.

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[JonathanBKR]

I cant stop learning because of you Jeremy.

[tinashe]

Your Energy makes things easier to understand 😁👍👍

[doctor.networks]

My mentor from 2010! Became a Network trainer my self because of you 😊

[davidsonmg]

Very good explanation! SOME REAL WORLD ADVICE IS PRICELESS!!!

[euphoria]

Love the real world examples, I can learn as much as I want about certain topics but without applying it to a realistic setting I have no idea what to do with that knowledge!

[alonzosmith]

Nice find on YouTube, will use to design my home network.

[TheBeach]

Really love the real world approach. I need to go back through the complete subnetting course though on cbtnuggets. I guess I can study the one in the CCNA course or Keith Barkers. Im seeing more and more at work how this is a needed skill. I worked with a co worker to create a vlan on dhcp scope and added helper address on switch. I want to really get this whole thing down so I can be better at designing as well as subnetting and creating vlans.

[jimboelterdotcomm]

"You can reuse the BYOD vlan at each new corporate location because the devices will never see each other." DAMN, that's a brilliant thing I never even considered.

[lunhamegenogueira]

Great nugget! Is it part of some specific course?

[DB-nlxw]

Can you explain how one vlan routes to other vlan?

[sphchurch]

I have a default gateway of @t. I need to get that into 4 vlans. What would the subnets be for the VLANS? Subnet mask is @t

[RobertSeeley]

I heard that you can use a /31 for point-to-point connections so you don't have to waste 2 address.

[DarkbaseTTV]

I like to have my printers completely seperated because of what a shitshow they are in terms of security. What I like to do is have them in a VLAN with no gateway and a print server that has two network cards, one in server and one in printer, and users just connect to the server IP and never reach the actual printers

[qwerky]

This is very confusing subject during my college years.