Summary:To truly understand Frame Relay subinterfaces and split horizon, you've got to see both in action.  Study for your exam and prepare for success with this fully illustrated lab from Chris Bryant, CCIE #12933. Keywords:ccna, ccnp, exam, certification, frame, relay, subinterface, split, horizon, rip, network, loopback Article Body:Earning your Cisco CCNA and CCNP is a tough...