Final answer:
In networking, the functionality that can be broadly divided concerning the network layer is the Internet Layer. It is responsible for routing packets to their destination across different networks. Other layers like the Data Link, Physical, and Transport layers serve different purposes in the networking model.
Step-by-step explanation:
In the context of networking, the functionality that can be broadly divided concerning the network layer is the Internet Layer. The Internet Layer is a component of the Internet protocol suite that is responsible for routing packets across network boundaries to ensure data reaches its destination address, regardless of the network topology. This is in contrast to the Data Link and Physical Layers, which deal with the physical aspects and direct connections of the medium used to carry data signals, and the Transport Layer, which is responsible for end-to-end communication and data flow control between two devices on a network.