Summary:To earn your CCNA and pass the BCRAN CCNP exam, you must master the many details of ISDN.  This includes multilink PPP!  Learn the details from Chris Bryant, CCIE #12933. Keywords:ccna, cisco, certification, ccnp, bcran, isdn, multilink, ppp, encapsulation, bri, pass, free, ccie Article Body:ISDN is a huge topic on both your Cisco CCNA and BCRAN CCNP exams.  While...