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CCNA Routing and Switching ICND2 200-105 Official Cert Guide, Academic Edition by Wendell Odom

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Chapter 3. Spanning Tree Protocol Implementation

Cisco IOS–based LAN switches enable Spanning Tree Protocol (STP) by default on all interfaces in every VLAN. However, network engineers who work with medium-size to large-size Ethernet LANs usually want to configure at least some STP settings. First and foremost, Cisco IOS switches traditionally default to use STP rather than Rapid STP (RSTP), and the simple upgrade to RSTP improves convergence. For most LANs with more than a few switches, the network engineer will likely want to influence the choices made by STP, whether using traditional STP or RSTP—choices such as which switch becomes root, with predictability about which switch ports will block/discard when all ports are physically working. ...

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