The full form of DCAP is Data Link Switching Client Access Protocol. It is data link layer protocol used between workstations and routers to transport SNA/NetBIOS traffic over TCP sessions.
Data-Link Switching, DLSw is a means of tunneling Systems Network Architecture (SNA) and NetBIOS traffic over an IP network. Before the development of DLSw, SNA and NetBIOS traffic was transported via Source-Route Bridging (SRB), a protocol for transporting in token ring environments.
In a large network, DCAP addresses the scalability problem by significantly reducing the number of peers that connect to the central site router. The workstations (DCAP clients) and the router (DCAP server) behave in a Client/Server relationship. Workstations are attached to a DCAP server. A DCAP server has a single peer connection to the central site router.
DLSw uses Switch to Switch protocol instead of SRB between routers to create DLSw peer connections, locate resources, forward data, handle flow control and error recovery. The routers are called data link switches.
Data Link Switching Clien tAccess Protocol introduces a hierarchical structure to resolve the scalability problems. All workstations are clients to the router rather than peers to the router. This creates a client/server model. It also provides a more efficient protocol between the workstation and the router.
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