Скачать или смотреть CCNA OSPF Routing-1 Class 27

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Open Shortest Path First (OSPF) is a link-state routing protocol that sends information about directly connected links to all routers in an AS network. The protocol maintains a complete picture of the network topology, which is shared with all routers in an area of the AS to calculate the shortest path to each destination.
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The CCNA—which stands for Cisco Certified Network Associate—is an entry-level information technology (IT) certification issued by networking hardware company Cisco. The CCNA is designed to validate your knowledge on fundamental networking concepts often requested in networking roles in IT positions