Summary:ISIS hellos differ from OSPF, and so do the adjacency types.  Learn these crucial differences and pass the BSCI exam with Chris Bryant, CCIE #12933. Keywords:cisco, ccnp, bsci, exam, certification, isis, router, type, hello, adjacency, L1, L2, L1/L2, ccna Article Body:In my last ISIS tutorial, I mentioned that while ISIS and OSPF are both link state protocols, their actual...