A Simulated Data Link layer. - - - SDL 01 - Network Simulator. - A simulated MAC+PHY with easy to use APIs like sdlTransmit() and sdlReceive(). - Unique 4-byte interface ids for each simulated node. - CSMA support. - CCA support. - Configurable network parameters like MTU, packet lifetime, max hosts, and bandwidth. SDL 02 - IPC Support. - Interprocess communication support. - Defined SDL protocol data packet. - Simplified transmission (no CSMA).