The official self-study test preparation guide for the Cisco CCNP BCMSN exam 642-811 This best-selling study guide helps you master all the topics on the new CCNP BCMSN exam, including: Switch operation and configuration VLAN Trunking Protocol (VTP) Aggregating Switch Links Spanning Tree Protocol (STP) Multilayer switching Router redundancy and load balancing Multicasting Quality of service (QoS) IP telephony Securing switch access Switch security with virtual LANs (VLANs)