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• internetwork – interconnection
of networks – also called an “internet”
• Subnetwork – a constituent of
an internet
• Intermediate system – a device
used to connect two networks allowing hosts of the networks to correspond with
each other
Bridge
Routers
• Internet is an example of an
internetwork.
• network of networks”
• “collection of networks
interconnected by routers”
• “a communication medium used by
millions”Email, chat, Web “surfing”, streaming media
• millions of connected computing
devices: hosts, end-systems
– PCs workstations, servers
– PDAs phones, toasters running network
apps
• communication links
– fiber, copper, radio, satellite
– Links have different bandwidth
• routers: forward packets
• Packet: a piece of message
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