23-01-2013, 11:38 AM
Internet Architecture and IP Addresses
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Introduction of TCP/IP Internet
Internet Architecture
Physical network: computers on the same physical network are physically connected.
Computers on different physical networks are not physically connected.
IP router (or IP gateway): dedicated systems that connect two or more networks.
Host: end-user system. It connects to physical networks, and there are possibly many hosts
per network
Properties of the classful addressing scheme?
They are self-identifying: the boundary between netid and hostid is self-explained from the
address. This can benefit routing because the entries of routing tables store mainly use netid,
not the entire IP address
How do routers work?
Routers need to find the right routes when forwarding packets.
Routers’ decision is based on the routing information they have
Routing table: use destination network, not the destination host; otherwise, the
table will be huge.