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One of those nights…

Studying for the CCNA ICND2 exam has moved into the final countdown, with only 3 weeks to go until the test. Up until this point I have focused on each concept as it has come up and not really thought about all the concepts covered on the ICND2 exam. Well, the sheer amount of content hit me like a ton of bricks tonight. I can’t believe how much information is covered in this exam. You could seriously split the exam in two with routing as one test and switching as another and they would still be two beefy exams. Though, to be honest, I felt this exact same way about ICND1 at about this time and did not have any issues passing the exam, so here’s to hoping the same applies to ICND2.

Anyway, tonights topic was the Open Shortest Path First (OSPF) routing protocol. Commonly used as a replacement to EIGRP for those networks not running cisco equipment. OSPF is a link state protocol with each router forming a map of the network. OSPF uses the Hello protocol to inform its neighbors about the routes it knows and periodically letting it’s neighbors know that it is still up and running. This is much more efficient than a distance vector protocol, such as RIP, which advertises it’s entire routing table with each broadcast.

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