Assume we have an isolated link not connected to any other l

Assume we have an isolated link (not connected to any other link) such as a private network in a company. Do we still need addresses in both network layer and data link layer? Explain.

Solution

Network address is required when you want to connect with other link(different newtwork).

Data Link address is required to communicate with the different systems in same network(link).

So, all the system in a private network of an company do not need network address. They can communicate using data link (MAC address or physical address).