1. A system for modeling interdependencies in a network datacenter, comprising: a machine-readable storage medium; one or more physical processors; a resource inventory comprising information describing a plurality of resources in an information technology datacenter and a plurality of open communication ports on the plurality of resources described in the resource inventory; one or more listeners configured to observe one or more network conversations that occur in the datacenter, the one or more network conversations involving the plurality of open communication ports on the plurality of resources described in the resource inventory; and a correlation engine that analyzes at least one observed network conversation of the one or more network conversations observed by the one or more listeners for modeling interdependencies in the network datacenter, wherein the correlation engine causes the one or more physical processors to: drop the at least one observed network conversation in response to a determination that the at least one observed network conversation fails to correlate with any of the plurality of open communication ports on the plurality of resources described in the resource inventory and further in response to a determination that the at least one observed network conversation comprises a network conversation between one of the resources in the information technology datacenter and a resource outside the information technology datacenter; and model a relationship between two of the plurality of resources described in the resource inventory in response to a determination that the at least one observed network conversation correlates with open communication ports on the two resources, wherein the correlation engine drops the at least one observed network conversation by no longer observing the network conversation for modeling interdependencies in the network datacenter.