You've just given a friend an overview of the ARP protocol. "I've got it," he says when you're through. ARP is part of the data link layer because it provides a service to the network layer." So, how...

You've just given a friend an overview of the ARP protocol.

"I've got it," he says when you're through.

ARP is part of the data link layer because it provides a service to the network layer."

So, how do you respond to him?

Note: This is a Computer Network question.