In the TCP IP model, routers belong in layer 3. This is a common model used in setting up information technology systems.
Routers would be in layer 3 of the OSI model also known as the Network layer.
Primarily at layer 1 and 2. The frame adds this information for these layers.
internet
Router works in Network Layer of OSI model
What is the purpose of the TCP/IP Network Access layer
TCP/IP because the osi model has seven layer but in tcp/ip only four layers and most important is that the tcp/ip model is reduce the function of osi model.
The network layer (Internet Layer in TCP/IP model) is the second layer of the TCP/IP model. IP (Internet Protocol), ARP (Address Resolution Protocol), RARP (Reverse Address Resolution Protocol), ICMP (Internet Control Message Protocol) and IGMP (Internet Group Management Protocol) are the protocols at this layer. http://www.omnisecu.com/tcpip/internet-layer.htm
Only the Network Layer (Layer 3) portion of the datagram is used by the Network Layer (Layer 3) portion of the TCP/IP Model. The network portion of the datagram includes IP Addressing information, and things such as TTL (Time to Live), and Datagram Priority markings.
IP is a layer 3 (network layer) protocol used for routing
Routers and layer 3 switches work at Layer 3 of OSI model.
The network access layer equivalent to the physical and data link layers of the osi model. basically this layer defines how data is physically sent through the network. There are several OSI and TCP/IP model video tutorials online.
Routers operate at layer 3. LAN switches operate at layer 2. Ethernet hubs operate at layer 1.