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The following are the layers in the internet protocol stack that the routers process:

1. Physical layer

2. Data Link layer

3. Network layer

Physical Layer:

Router is a physical device and acts as a bridge between computer and the network. So, the router directly processes the physical layer.

Data Link Layer:

Router sends the frame to the next node (routers, systems and other devices) after identifying the route that the packet needs to travel. So, the router processes the data link layer.

Network Layer:

Router assigns address to the segment which it receives and forms a datagram. So, the router processes the network layer.

Therefore, routers process the physical, data link, and network layers of the internet protocol stack.


The following are the layers in the internet protocol stack that the link-layer switch process:

1. Physical layer

2. Data Link layer

Physical Layer:

Link layer switch is a physical device and acts as a bridge between computer and the network. So, the switch directly processes the physical layer.

Data Link Layer:

Link layer switch floods the frame to all nodes (routers, systems and other devices) that are connected to it. So, the switch processes the data link layer.

Note: Switches doesn’t have capability to assign address.

Therefore, link-layer switches process the physical and data link layers of the internet protocol stack.


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