Question

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

Answer 1

Answer: 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.