You don't want to hand your datacenter over to an intruder quite so easily
in the highlands of Scotland, and I found myself needing to explain the difference between East-West and North-South traffic to some colleagues in the context of datacenter security.I'm not exactly sure of the origins of this naming convention, but the idea is that the ingress/egress point of a datacenter carries the"North-South" traffic, while the traffic that flows between servers within the datacenter is the"East-West" traffic.
This is the"perimeter" model of security, which became prominent for several reasons. First, the number of ingress points to a datacenter is small – maybe as low as one, certainly no more than a handful. So it is natural to place centralized security appliances next to those choke points so that all the traffic can be passed through them.
One version of this story is that the original internet architecture had no security, and that early efforts to add security followed the end-to-end argument, which makes a good case for putting security into end-systems.For example, encryption and authentication are security mechanisms that can be implemented in end-systems .with Marjory Blumenthal, a multitude of factors pushed the internet towards the adoption of centralized appliances inserted into the path of traffic by the late 1990s.
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