December 2007
Intermediate to advanced
464 pages
14h 44m
English
Content preview from Patterns in Network Architecture
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Chapter 4. Stalking the Upper-Layer Architecture
You have Telnet and FTP. What else do you need?
—Alex McKenzie, 1975
If the Virtual Terminal is in the presentation layer, where is the power supply?
—Al Reska, 1979
Introduction
Although there has been a strong interest in “the upper layers” over the years, as these quotes indicate, there have been differing misconceptions about them. Since the earliest days of the Net, the upper layers have been a bit mysterious and unclear. The early network software removed concerns of reliability and routing from the applications. And with only a couple of dozen hosts connected by what seemed high-speed lines, one had the illusion of having an environment for distributed computing. All of this sparked the ...
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