Figure 3.4 Packet loss and delay on the Internet
Some critical knowledge about the network part of the Internet is still use-
ful for making decisions about applications and communications. Table 3.1
provides a short summary of the Internet architecture, guidelines, and philos-
ophy [6].
Table 3.1 Internet Architecture, Guidelines, and Principles
GUIDELINES AND
PRINCIPLES DESCRIPTION
The Simplicity Principle Application knowledge and state does not belong in
the network, although the Internet core performs
complex routing and maintains routing state.
The complexity of the Internet belongs at the edges
and any additional complexity is added above the IP
layer. The IP layer of the Internet should remain as
simple as possible.
Complex systems have nonlinear catastrophic
behavior that is thus avoided here. Loose coupling
between components is desirable to reduce the
probability of failures.
(Note that complexity is also expensive, but,
unfortunately, designing complex solutions is easier
than designing simple ones.)
(continued)Global Resonse Time (MS) : Past 30 Days
257
233
210
187
163
140
117
12/2808:00 01/0208:00 01/0708:00 01/1208:00 01/1708:00 01/2208:00 01/2708:00Global Resonse Time (MS) : Past 24 Hours
152
148
144
140
136
132
129
01/2607:55 01/2611:55 01/2615:55 01/2619:55 01/2623:55 01/273:55 01/2707:55Global Resonse Time (%) : Past 30 Days
45
37
30
22
15
7
0
12/2808:00 01/0208:00 01/0708:00 01/1208:00 01/1708:00 01/2208:00 01/2708:00Global Resonse Time (%) : Past 24 Hours
9 7 6 5 3 2 101/2607:55 01/2611:55 01/2615:55 01/2619:55 01/2623:55 01/273:55 01/2707:55Architectural Principles of the Internet 45