3. What Are The Four Types Of Network Backbone?

There are four types according to COMPTIA standards

Serial, Distributed, Collapsed and Parallel

I don't really clearly understand the difference between them, but I do know.....
* Serial is the most common and simplest one where a single backbone line has several hubs connected to it.
* Distributed is a Hierarchy. A group of networks (that are interconnected with hubs) connect to a group of serial connected hubs and routers. A network could be like the different building floors that has several hubs to interconnecting each floor as a network. These different floors are connected to a group of serially connected hubs and routers.
* Collapsed refers to a network that may have a lot of different networks but all connect to one hub, router or switch. If this one device fails all inter-connectivity between the networks will collapse.
*Finally the parallel backbone is the one I am not really clear on......... It is setup in the same way as a collapsed network, but it has multiple media (cable) connections between the dependent hubs. This makes it more reliable that the collapsed network.

Hope it helps!

Kowash