There are also additional networks that use our networking gear (routers and switches, trunks, etc) but we do not administer; DGP networks for example.
You should never alter the configuration of network cables - including moving them around, plugging things into them, or unplugging them unless you know that the cables are infrastructure that you are responsible for (i.e. a sandbox that you administer machines in). As a general rule, if you are not completely sure of what you are doing regarding network cabling, ask your Point of Contact .