Labs · 3 scenarios
ARP Resolution
See how a host turns an unknown IP into a MAC address — one subnet check and one request/reply exchange at a time.
Beginner
ARP within the same subnet
Work out whether a destination is local, then build the ARP request yourself.
Intermediate
ARP across a gateway
Find out why a remote destination means ARPing for the gateway instead.
Advanced
ARP cache troubleshooting
Diagnose a stale ARP entry left behind after a server's NIC was replaced.