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9. Layering in the Internet Application Transport Internet Network interface Application Transport Internet Network interface Internet Network interface Identical message Identical packet Identical datagram Identical datagram Identical frame Identical frame Physical Net 1 Physical Net 2 Gateway G Host A Host B
27. Summary of special address conventions This host Limited broadcast (local net) Host on this net Directed broadcast for net Loopback all 0s all 0s host all 1s net 127 anything (often 1) all 1s
28. Classess and address formats 0 1 2 3 4 8 16 24 31 netid netid hostid hostid multicast address reserved for future use Class A Class C Class D Class E 0 0 0 0 netid hostid Class B 0 1 1 1 1 1 1 1 1 1 1
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32. Subnetting Class B 0 1 Class B 0 1 Class B Address: Before Subnetting Class B Address: After Subnetting Network Network Host Host Subnet