▶ 14.4 Enterprise Firewalls
The ARPANET began as a research network in 1969. Within a decade, it was so reliable that many organizations used it for routine data traffic. The same happened to the internet in the 1980s.
Because it was originally a research network, many internet sites focused on supporting and promoting research efforts. Many sites provided public access to some basic resources and data files. Most sites provided services like “finger” (Section 2.3), email, and access to shared files. Some sites even allowed outsiders to store files on their file servers to simplify sharing with the site’s own users.
At the same time, computers had become cheap and powerful enough to earn a place on the desktop of most technical professionals. ...
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