High Quality Content by WIKIPEDIA articles! ACF NCP stands for Advanced Communication Function - Network Control Program. It is the program that controls network communications in a standard SNA. DLSW+ is an IP transport solution for SNA/NetBIOS between peering routers. In traditional SNA networks, ACF/VTAM software on the host and ACF/NCP software on the FEPs together perform all routing of SNA traffic, ensuring that the traffic flows appropriately from source to destination. Because it does not have any ACF/NCP or ACF/VTAM functionality within it, DLSw+ routers cannot route traditional SNA traffic. Instead, DLSw+ simply encapsulates the traffic in IP. Within the IP network the traffic is routed, but when converted back to SNA, it must continue to be routed by ACF/NCP or ACF/VTAM. Two issues that result from this fact have caused some IT organizations to continue to support FEPs in the data center.

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