Originally, so you could group related VLANs together. e.g. VLAN30 is Marketing, then later you need a second marketing team so they have VLAN31. If you’d had V

Originally, so you could group related VLANs together. e.g. VLAN30 is Marketing, then later you need a second marketing team so they have VLAN31. If you’d had VLAN1, 2, 3, etc, you couldn’t do this. That everyone does it - even on small home networks - is just convention.