-Circles represent processing units and squares represent network
-routers. Bold lines represent communication links. The zone "AS2" models the core of a national network interconnecting a
-small flat cluster (AS4) and a larger hierarchical cluster (AS5), a
-subset of a LAN (AS6), and a set of peers scattered around the world
-(AS7).
-
-Networking zones (:ref:`pf_tag_zone`) are an advanced concept used to factorize the description
-to reduce the size of your platform on disk and in memory.
-Any zone may contain sub-zones, allowing for a hierarchical
-decomposition of the platform (as you can see in the tree representation on the left).
-Routing can be made more efficient (as the
-inter-zone routing gets factored with :ref:`pf_tag_zoneroute`) and
-allows you to have more than one routing model in your platform. For
-example, you can have a coordinate-based routing for the WAN parts
-of your platforms, a full routing within each datacenter, and a highly
-optimized routing within each cluster of the datacenter. In this
-case, determining the route between two given hosts gets
-"somewhat more complex" but SimGrid still computes
-these routes for you in a time- and space-efficient manner.
-
-
-Routing basic elements: hosts and links
-***************************************
-
-A platform is composed of a set of resources, namely hosts, links and disks.
-On these resources you may run activities that will require some capacity and
-will make the time advance.
-
-Given a look at this example of some hosts and links being declared
-
-.. code-block:: xml
-
- <zone id="AS5-4" routing="Full">
- <host id="host0" speed="1Gf"/>
- <host id="host1" speed="2Gf"/>
- <link id="link0" bandwidth="125MBps" latency="100us"/>
- </zone>
+Both images above represent the same platform. On the left, circles represent hosts (i.e. processing units) and squares
+represent network routers. Bold lines represent communication links. The zone "AS2" models the core of a national
+network interconnecting a small flat cluster (AS4) and a larger hierarchical cluster (AS5), a subset of a LAN (AS6), and
+a set of peers scattered around the world (AS7). On the right, the corresponding hierarchy of zones is highlighted.