Why do we need both MAC address and IP address for a network interface? Why not just one address? If only IP address: no link layer operations, no bridging, no broadcast links.  If only MAC address:...

Why do we need both MAC address and IP address for a network interface? Why not just one address?

If only IP address: no link layer operations, no bridging, no broadcast links.

 If only MAC address: no hierarchical Internet architecture, no subnet operations, no routing.

Why are MAC addresses fl at but IP addresses hierarchical?

Why could there be multiple matched IP prefixes in a router’s table lookup? (Explain what network configurations could result in this.)