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Listing 1b Display the ARP cache with the "arp -an" command

? (192.168.1.1) at 00:04:5A:EB:E9:35 [ether] on eth0
? (192.168.1.99) at 00:E0:1E:60:8E:C7 [ether] on eth0
? (192.168.1.103) at 00:D0:09:D6:E5:F6 [ether] on eth0
? (RoadRunner) at 00:50:BF:16:BA:AE [ether] on eth0