Domain Question

typesh

Hello everyone... Just wondering if someone can confirm whether I am correct.

Thinking about broadcast/collision domains:

Routers break up both broadcast domains and collision domains.

Switches break up collision domains by placing each node on its own collision domain (provided only one device is connected to that switchport). If Router1 has Switch1 connected out its FastEthernet interface, and Switch1 connects to Switch2, and Switch2 connects to Switch3, then everything outside of the Routers FastEthernet interface is one broadcast domain, with collision domains occurring on the individual switchports. So if 3 switches are all connected, we do not have 3 broadcast domains- we still have 1. The number of collision domains would depend on how many devices are connected to these switches plus the number of trunk connections.

Hubs create one collision domain and one broadcast domain. Even if many hubs are connected, it is still considered one large broadcast/collision domain.

Can anyone please confirm? Thank you!

wastedtime

Yes, although I find it easier to look at what layer the devices work at. Layer 1 devices do not separate collision or broadcast domains. Layer 2 devices separate collision domains but don't separate broadcast domains. Layer 3 and above separate both collision, and broadcast domains.