What are the network layer protocols for flow control?

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http://serverfault.com – This might seem a bit noobish but I am confused. This link here points out that congestion control is taken care at TCP layer and this link here tells me that it is at Network layer. Can someone explain precisely at what layer the congestion control is taken care of ? Webopedia says ... Network (Layer 3) This layer provides switching and routing technologies, creating logical paths, known as virtual circuits, for transmitting data from node to node. Routing and forwarding are functions of this layer, as well as addressing, internetworking, error handling, congestion control and packet seque (HowTos)