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When you are studying to pass the BSCI exam and earn your CCNP certification, you are going to be introduced to ISIS. ISIS and OSPF are each link-state protocols, but ISIS works quite differently from OSPF. You should master these facts in order to earn your CCNP. A single of the key differences between OSPF and ISIS will be evident to you when you very first begin your BSCI exam research, and that is the terminology. ISIS uses terms that no other protocol you've studied to date makes use of, and mastering these new terms is the initial step to BSCI and CCNP exam good results. water ionizer water ionizer First off, what does "IS" stand for in "ISIS"? It stands for "Intermediate System", which sounds like a group of routers. As opposed to Autonomous Systems, which are logical groups of routers, an Intermediate Program is merely a single router. That's it. water ionizer talk You'll also turn out to be familiar with Finish Systems, referred to in ISIS as an "ES". The End Program is merely an end host. ISIS and OSPF each use the notion of places, but ISIS requires a distinct method to this concept. ISIS routers use three various types of routing levels, according to the area a router has been placed in. Level 2 routers are linked only to the backbone and serve as a transit device between non-backbone places. Level 1 routers are completely internal to a non-backbone place. ISIS uses each Level-1 and Level-two Hellos, which means that the two types of routers just mentioned can't type an adjacency. Fortunately for us, there is a middle ground, and that is the Level 1-two router. These routers connect non-backbone areas to backbone places. L1-L2 routers maintain two separate routing tables, one for L1 routing and another for L2 routing. This is the default setting for a Cisco router, and L1-L2 routers can form adjacencies with both L1 and L2 routers. Portion of the challenge of studying ISIS is acquiring used to the differences in between ISIS and OSPF. Preserve studying the terminology, master one concept at a time, and soon you will be a master of ISIS and a CCNP to boot!