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The Network layer is where the frames of the Data Link layer become packets. The best way to think of the Network layer is as the mailroom clerk of the OSI model. The clerk receives mail and directs it to the appropriate couriers. In similar fashion, the Network layer translates the frames it receives from the Data Link layer into more logical packets which can be routed to other networks (like sending it to a courier). At the Network layer, you can begin to actually communicate across a Network, but the service is called "unreliable" because no connection can be established. Communication over the Network layer is something like throwing a message in a bottle into the sea - you cannot verify that the other person ever reads the message. It should be noted that most of what we call "routing" occurs at the network layer - that is, network traffic is routed from one network to another at this layer, allowing for inter-network (as opposed to intra-network) communication.
All people seem to need data processing, or Please do not through sausage pizza away Application, presentation, session, transport, network, data link, and physical. or Physical, data link, network, transport, session, presentation, and Application.
The network layer or layer 3 is where you would expect to find routers or possibly layer 3 switches. The network layer is the point where different networks can converge. Routing tables held on layer 3 devices are the path out of the network. If you look at your ipconfig information with the /all switch you will see an address given for default gateway. This will point to the router that is aware of all other networks or sub networks you have access to. In the home this is usually the inside or private address of your DSL or cable modem. I understand some bridges operate at layer 3 as well. At layer 3 Ethernet frames are formed into packets in preparation for routing between networks or sub networks. Because the OSI layer is as implied open there are many examples of software and hardware that can operate at the network layer but router would be the best answer most of the time.
The most simplest answer is that, the network layer routes data beyond the LAN boundary and it ues routing table with IP addresses. This the layer that your ROUTERfuntions
Physical and MAC addressing are found in the OSI layer 2?