Web Creators Call Internet Outdated
ElvaWSJ writes "Several networking pioneers are dissatisfied with the Internet's underpinnings, and some are offering remedies to ease the strain that bandwidth-hungry services put on technology networks. Along with other projects here in the US and around the world, numerous companies and organizations are looking to rewrite the underpinnings of the internet. This piece looks at new concerns from old hands at networking, with comments from folks like Larry Roberts and Len Bosack. 'Mr. Roberts's concern over the Internet's infrastructure stretches back years. Even while at ARPAnet, he says he was unsure how long the technology could work, especially since the system didn't ensure that information packets would arrive at their destination. His fears crystallized in the late 1990s when he saw companies begin to use the Internet to make phone calls and consumers begin to dabble in online video.'"
Without getting too network-geeky, while they are both protocols they operate on different levels of the OSI model.
SMTP operates at the highest level (Layer 7); it has absolutely no concern for how messages are delivered, it is only concerned with how to format those messages, how to parse and read them, etc. Once it has the message formatted as what you would recognize as email, it passes it down to lower OSI levels and stops caring. You can completely gut TCP/IP and SMTP will continue to function; likewise you can completely alter SMTP without TCP/IP even caring.
TCP, on the other hand, is a Layer 4 protocol. Layer 4 is where the actual work of sending data takes place once the connection is established, and ensures reliable transmission.
IP is a level lower, on the Network level (3). Basically speaking, it figures out how to send the data. It does the job of routing.
While it is a matter of semantics, the lower you go down the more of "the Internet" one could argue it is. I would consider it fair to say TCP and IP both make up "the Internet" (though they do not have to--this was by choice). Things like SMTP, FTP, HTTP, etc. are services that run on top.
(These explanations are greatly simplified of course.)