In implementations that have multiple
physical networks, all data traffic from Network 1 destined for
Network 2 has to go through the router. In this implementation there
are 2 broadcast domains. Both networks will have unique Layer 3 IP
Addressing Network/Subnetwork Addressing schemes.
In a structured Layer 1 wiring scheme,
multiple physical networks can be created very easily by simply
patching the horizontal cabling and vertical cabling into the
appropriate Layer 2 switch using patch cables. As you will see, this
implementation provides for more robust network security. Traffic
between the two networks can be controlled at the router. The router
is also the central point in the LAN for traffic destined for the WAN
port.
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