Cisco CCNP / BSCI Certification: Introduction To ISIS Terminology: Unterschied zwischen den Versionen

Version vom 3. September 2012, 03:11 Uhr

When you happen to be studying to pass the BSCI exam and earn your CCNP certification, you happen to be going to be introduced to ISIS. ISIS and OSPF are both link-state protocols, but ISIS operates quite differently from OSPF. You ought to master these particulars in order to earn your CCNP.



1 of the major differences in between OSPF and ISIS will be evident to you when you initial start your water ionizers BSCI exam studies, and that is the terminology. ISIS utilizes terms that no other protocol you have studied to date makes use of, and mastering these new terms is the initial step to BSCI and CCNP exam achievement.



First off, what does "IS" stand for in "ISIS"? It stands for "Intermediate Program", which sounds like buy water ionizer 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.



You will also become familiar with Finish Systems, referred to in ISIS as an "ES". The End Method is simply an end host.



ISIS and OSPF both use the concept of areas, but ISIS requires a distinct approach to this idea. ISIS routers use three different types of routing levels, according to the region a router has been whole house carbon filter placed in. Level two routers are connected only to the backbone and serve as a transit device among non-backbone places. Level 1 routers are totally internal to a non-backbone place.



ISIS makes use of each Level-1 and Level-two Hellos, which means that the two sorts of routers just mentioned cannot 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 areas. 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 type adjacencies with each L1 and L2 routers.



Component of the challenge of mastering ISIS is obtaining employed to the differences amongst ISIS and OSPF. Preserve studying the terminology, master a single concept at a time, and soon you are going to be a master of ISIS and a CCNP to boot!