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Internet
• 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.
• internet : collection of
networks interconnected by router and/or bridges
• The Internet
• The global collection of
thousands of individual machines and networks
• Intranet
• Corporate internet operating
within the organization
• Uses Internet (TCP/IP and http)
technology to deliver documents and resources
• End System (ES)
• Device attached to one of the
networks of an internet
• Supports end-user applications
or services
• ES sometimes called DTE
• Intermediate System (IS)
• Device used to connect two
networks
• Permits communication between
end systems attached to different networks
• Examples: Routers and Bridges
• Bridge
– IS used to connect two LANs
using similar LAN protocols
– Address filter passing on
packets to the required network only
– OSI layer 2 (Data Link)
• Router
– Connects two (possibly
dissimilar) networks
– Uses internet protocol present
in each router and end system
– OSI Layer 3 (Network)
X.25
– First public data network
– Connection number used for data
transfer of packets
– data packets contain 3 byte
header and upto 128 bytes of data
– X.25 replaced by Frame Relay
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