Resolution Problems and Solutions
Indirection through addressing/naming => requires resolution
Problem usually is to map destination layer N address to its layer N-1 address to allow packet transmission in layer N-1.
1. Direct mapping: Make the physical addresses equal to the host ID part.
- Mapping is easy.
- Only possible if admin has power to choose both IP and physical address.
- Ethernet addresses come preassigned (so do part of IP addresses!).
- Ethernet addresses are 48 bits vs IP addresses which are 32-bits.