OSPF summary

Here is a list of the most important OSPF features:

  • link state routing protocol
  • classless routing protocol
  • supports VLSM (Variable Length Subnet Mask)
  • converges fast
  • uses the concept of areas
  • uses multicast address for routing updates ( and
  • sends partial routing updates
  • supports only equal cost load balancing
  • manual summarization can be done only on ABRs and ASBRs
  • uses interface cost as a metric
  • uses SPF algorithm to calculate the best paths
  • open standard
  • each router inside an area has the same topology table
  • supports clear-text and MD5 authentication

Prerequisites for 200-301

200-301 is a single exam, consisting of about 120 questions. It covers a wide range of topics, such as routing and switching, security, wireless networking, and even some programming concepts. As with other Cisco certifications, you can take it at any of the Pearson VUE certification centers.

The recommended training program that can be taken at a Cisco academy is called Implementing and Administering Cisco Solutions (CCNA). The successful completion of a training course will get you a training badge.

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