connecting laptop needs to get its
own IP address, addr of first-hop
router, addr of DNS server: use DHCP
DHCP request encapsulated in UDP,
encapsulated in IP, encapsulated in
802.3 Ethernet
Ethernet frame broadcast (dest:
FFFFFFFFFFFF) on LAN, received at
router running DHCP server
Ethernet demuxed to IP demuxed,
UDP demuxed to DHCP