Chapter 2. Spanning Tree Protocol Concepts

Spanning Tree Protocol (STP) allows Ethernet LANs to have the added benefits of installing redundant links in a LAN, while overcoming the known problems that occur when adding those extra links. Using redundant links in a LAN design allows the LAN to keep working even when some links fail or even when some entire switches fail. Proper LAN design should add enough redundancy so that no single point of failure crashes the LAN; STP allows the design to use redundancy without causing some other problems.

STP affects many aspects of how switch forwarding logic works. Because Cisco puts the STP exam topics into the ICND2 half of the CCNA Routing and Switching exam, all the detailed examples in the ICND1 Cert ...

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