Addresses
Ethernet address (MAC address )
- 48-bit unique addresses hard wired in NICs (280 trillion)
- 12 hex numbers, e.g. 00-A0-C9-9F-00-07
- first three identify company, Intel in the example
- how to see: System Information, Network Adapter
IP address (number)
- 32-bit value, not hard coded (4 billion), assigned manually or by DHCP
- four dotted quads, each quad a decimal from 0-255, corresponding to eight bits, e.g. UBMAIL IP address is 198.202.0.25
