2.2.5 Addressing Architecture

An IP datagram carries 32-bit source and destination addresses, each of which is partitioned into two parts - a constituent network prefix and a host number on that network. Symbolically:

      IP-address ::= { <Network-prefix>, <Host-number> }

To finally deliver the datagram, the last router in its path must map the Host-number (or rest) part of an IP address to the host's Link Layer address.

• 2.2.5.1 Classical IP Addressing Architecture
• 2.2.5.2 Classless Inter Domain Routing (CIDR)