arp in action...

i'm a capturing fool...

notice the captures... in the first the mac is all 0's... after the arp is succesful, the mac gets
populated...

sw2960#sh arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  192.168.1.1             -   001e.79cd.92c0  ARPA
sw2960#ping 192.168.1.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:
.!!!!