The following information was obtained from a Unix host with an IP address of 20

Question

The following information was obtained from a Unix host with an IP address of 205.133.127.8/24 and a gateway of 205.133.127.1:

(205.133.127.1) at 0:70:41:12:8:9
(205.133.127.34) at 0:50:4:1:89:39
(205.133.127.39) at 0:a0:4b:5:21:c8
(205.133.127.76) at 8:0:20:b:6d:b9
(205.133.127.84) at 0:c0:5:4:14:17
(205.133.127.85) at 0:c0:5:4:1e:19
(205.133.127.86) at 0:c0:5:4:39:2a
(205.133.127.87) at 0:c0:5:4:5c:50
(205.133.127.101) at 0:c0:5:4:39:2a
(205.133.127.103) at 0:c0:5:1:16:81
(205.133.127.105) at (incomplete)
(205.133.127.116) at 0:80:5f:e4:f1:46
(205.133.127.234) at 0:40:33:ca:a1:5d
(205.133.127.238) at 0:60:97:79:2:8a
(205.133.127.255) at ff:ff:ff:ff:ff:ff

Describe the sequence of events that would occur if the host had packets destined for:
a. 205.133.127.84
b. 205.133.127.83
c. 205.133.181.3

Explanation / Answer

a) Dest IP: 205.133.127.84 - host looks in its own ARP table - host finds the MAC address for the Dest IP. - host sends a packet to Dest MAC: 0:c0:5:4:14:17 b) Dest IP: 205.133.127.83 - host does not know MAC address for dest IP - host broadcasts an ARP request for 205.133.127.83 - 205.133.127.83 responds to the host's MAC, with a packet containing it's MAC - host adds new entry to it's ARP table with Dest's IP & MAC - host then sends packet to Dest MAC c) Dest IP: 205.133.181.3 - host realizes Dest IP is on different subnet - host looks in ARP table for the MAC address of it's Default Gateway - host then forwards packets to Dest MAC: 0:70:41:12:8:9

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