What is the lowest layer of the osi model at which lans and wans support the same protocols?
layer 2
layer 3
layer 4
layer 5

Layer 3

Explanation:

The layer 3 in OSI model is the network layer which is responsible for routing the packet across the network.

So we need a switch and a router for the LAN and WAN connection and both of them has to support the same protocols at layer 3.

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