I have Cisco ACS-1113. I want to connect this in existing network.
My query is ACS have two LAN interface. Whats the use of second interface as Cisco documents states "ACS SE supports the operation of either Ethernet connector, but not both connectors".
It can communicate with other subnets just like any other device. If a device is not on the local subnet, it forwards to the default gateway and off it goes.
Here's a link to the configuration guide-