Switched Networks in Computer Networking:
A network can be defined recursively as...
- two or more nodes connected by a link
- circular nodes (switches) implement the network
- squared nodes (hosts) use the network
A network can be defined recursively as...
- two or more networks connected by one or more nodes: internetworks
- circular nodes (router or gateway) interconnects the networks
- a cloud denotes “any type of independent network”
Switching Strategies:
Circuit switching:
carry bitstreams
- establishes a dedicated circuit
- links reserved for use by a communication channel
- send/receive bitstream at a constant rate
- example: original telephone network
Packet switching:
store-and-forward messages
- operates on discrete blocks of data
- utilizes resources dynamically according to traffic demand
- send/receive messages at a variable rate
- example: Internet
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