Chapter 8, “Implementing Ethernet Virtual LANs,” explains the concepts and
configuration surrounding virtual LANs, including VLAN trunking.
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Chapter 9, “Spanning Tree Protocol Concepts,” discusses the concepts behind
some switch interfaces block frames to prevent frames from looping continuously
around a redundant switched LAN.
Chapter 10, “RSTP and EtherChannel Configuration,” shows how to configure
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xlvi CCNA 200-301 Official Cert Guide, Volume 1