Persay I wanted to take down a network (theoreticly) how would I go about doing that, this is presuming I can get a connection inside the network, but it would be restricted so I couldent install any programmes on a machine that is ment to be on the network, but I could get a connection to it but no internet access or privlages.
This is purely for educational reasons...
By "bringing down" do you mean doing penetration testing and trying to comprimise the security of the network or just complete denial of service?
Mostly just a DOS, I have looked at things like LOIC but I am unsure of how to proseed with them.
DDoS is dead simple. You throw so much shit at something that it can't keep up. This is boring because it requires big connections and if you are in the same network you shoot up yourself. There are other kind of things you can do, like making routing impossible (throwing random ARP packages around) and stuff like that.
... first off, by asking here it shows you have done almost no research yourself.
anyway, to answer your question in a way that will requite you to do research....
if you do have access to the internal network, spoof all arp replys to point at 00:00:00:00:00:00. no ip addresses will resolve to valid hardware interfaces.
if you are not on the internal network, the best way would be to flood the internal DNS server with requests to resolve hostnames that have a very high hop count. if you cant do that, a syn flood of the dns servers usually is the next best thing.
If you can get access in the network, you don't need to do a lot, as a matter of fact, you could bring down the network with an average smartphone. A network-level denial-of-service attack, no need for flooding too. Just send an ARP broadcast, confusing the computers of the gateway location, they'll be screwed.
that's assuming the arp table is unlocked.
Which is the case most of the time.
Well DOS is a broader term than just a DDOS attack, it just means not allowing users access to the data.