One flat network works fine, right up until it doesn't. Watch a network drown in its own chatter, learn where the boundary line goes, then design subnets for real clients.
Devices6
Broadcasts/min~90
Network health
// 192.168.10.0/24 — one broadcast domain
Monday, 9 am. Your client has six machines in Admin, all on a single flat network: 192.168.10.0/24. Every device shares one broadcast domain: when any machine shouts "who has 192.168.10.7?", every other machine hears it and must stop to check. With six devices, that's nothing. Watch what happens as the business grows.
Boundary/26
Subnets4
Usable hosts each62
Challenges0 / 5
// The boundary — 192.168.10.0, mask sliding from /24 to /30