The following information was obtained from a host with an IP address of 205.133
ID: 641081 • Letter: T
Question
The following information was obtained from a host with an IP address of 205.133.127.8 subnet mask 255.255.255.0 and a default gateway of 205.133.127.1: *Note: all addresses between 205.133.127.0 and 205.133.127.255 are on the same LAN
C:>ping foxnews.com
Pinging 96.17.202.208 with 32 bytes of data:
Reply from 96.17.202.208: bytes=32 time<10ms TTL=255 Reply from 96.17.202.208: bytes=32 time<10ms TTL=255 Reply from 96.17.202.208: bytes=32 time<10ms TTL=255
C:>ARP -a
Internet Address Physical Address 205.133.127.1 00-50-54-7b-e8-c0 205.133.127.4 00-10-1f-52-10-00 205.133.127.8 00-60-08-93-38-c2 205.133.127.9 00-60-08-93-38-db 205.133.127.12 00-50-04-c3-c1-95 205.133.127.14 00-c0-f0-12-ad-59 205.133.127.16 00-10-4b-c9-61-37 205.133.127.17 00-50-da-11-f7-5f 205.133.127.30 0-50-da-0b-ff-4b 205.133.127.34 00-50-04-01-89-39 205.133.127.255 ff-ff-ff-ff-ff-ff 205.133.127.39 00-a0-4b-05-21-c8 205.133.127.47 00-c0-05-01-4e-4b 205.133.127.53 00-c0-05-04-39-2a 205.133.127.76 08-00-20-0b-6d-b9 205.133.127.84 00-c0-05-04-14-17 205.133.127.85 00-c0-05-04-1e-19 205.133.127.86 00-c0-05-04-39-2a 205.133.127.88 00-c0-05-04-5b-c9 205.133.127.101 00-c0-05-04-39-2a 205.133.127.110 00-c0-05-04-14-17 205.133.127.116 00-80-5f-e4-f1-46 205.133.127.158 00-c0-05-04-39-2a 205.133.127.234 00-40-33-ca-a1-5d 205.133.127.238 00-60-97-79-2-8a
a) Describe the sequence of events (in detail) that would occur if this host then had packets destined for: 1) 205.133.127.86 2) 205.133.127.87 3) 96.17.202.208
Explanation / Answer
205.133.127.87
The host does not know MAC address for destination IP address.
So the host broadcasts an ARP request for 205.133.127.87
The IP address 205.133.127.83 responds to the host's MAC, with a packet containing it's MAC address.
The host adds new entry to it's ARP table with Destination’s IP and MAC.
The host then sends packet to Destination MAC address.
The host looks for the destination IP address.
Since it is not present with in the IP address, it will broad cast the destination IP address.
The broad cast is done through the default gate way IP address.
The destination address is not with in the LAN.
So it broad cast the address to the outer Internet gate way.
If the destination is responses to the IP address, it will send a response packet with the MAC address.
The MAC address is added to the ARP table.
The data is then sent to the desired MAC address.
In general, the data packet is sent to the MAC address of the default gate way 00-50-54-7b-e8-c0.
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