Riporto così, senza molti commenti questo post di Brough Turner. Una specie di promemoria, su cosa è veramente Internet. Ed ha funzionato perché è così, tanto diversa da come vorrebbero che fosse.
I see and hear a lot of confusion about next generation networks (NGN). In most cases people are using the term roughly as the ITU-T defines it:
A Next Generation Network (NGN) is a packet-based network able to provide services including Telecommunication Services and able to make use of multiple broadband, QoS-enabled transport technologies and in which service-related functions are independent from underlying transport-related technologies.
but many people don't realize how little this has to do with the Internet.
The Internet is a "network of networks" that includes millions of smaller domestic, academic, business, and government networks interconnected using IP. It is a hierarchy because there is a backbone of ~28,000 autonomous systems (ASs)
which exchange IP packets using routes established by Border Gateway Protocol (BGP). [From NGN ≠ the Internet, and never will]
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