1. A network comprising a plurality of nodes, wherein at least one of the plurality of nodes includes a switching means arranged to carry out a Simple Transit Core Function and three or more of the plurality of nodes include a Single Link Interface which Single Link Interface has associated Output Attributes and/or Input Cognisant Attributes where each Simple Transit Core Function at one node is not logically connected to another Simple Transit Core Function at another node and each Simple Transit Core Function at one node is logically connected to at least three Single Link Interfaces at other nodes and wherein the nodes including Single Link Interfaces which axe connected to one instance of a node arranged to carry out a Simple Transit Core Function are controlled by respective Intercommunicating Connection Acceptance Control Processes such that at least one pair of nodes including Single Link Interfaces is arranged to establish a connection between the pair of nodes via an intermediate Simple Transit Core Function of an intermediate node, a fast node of the pair is arranged to determine whether or not a link between the first node and the intermediate node can support the connection based on Output Attributes and a second node of the pair is arranged to determine whether or not a link between the intermediate node and the second node can support the connection based on Input Cognisant Attributes and the connection is only admitted if both of the links can support the connection.