Prof. Alfred J Bird, Ph.D., NBCT Office – Science, 3rd floor, S Office Hours – Monday and Thursday 3:00 to 4:00

 VLAN  Spanning Tree Protocol  SNMP  PoE  Physical vs. Virtual

 2 Approaches  Static  Dynamic  3 types of VLANs  Port-based  Tag-based  Protocol-based

 When devices are set up in a Mesh Configuration loops are possible  Designed to prevent looping  Switches exchange information using BPDUs (bridge protocol data units)

 BPDU (Bridge Protocol Data Unit)  Root Switch  Configuration BPDU  TCN (Topology Change Notification)  TCA(Topology Change Notification Acknowledgement)

 Election of a root switch  Removing redundant data paths  Calculate shortest distance to root switch  Select best path between switches  Select ports that are parts of the spanning tree

 Blocking State  Listening State  Learning State  Forwarding State  Disabled

 SNMP v1  SNMP v2  SNMP v3

 PoE  PD (Powered Device)  PSE (Power Sourcing Equipment)  Endpoint PSE  Midpoint PSE  Resistive Power Discovery

 No need to run external power to each device  Only one cable for power and data  Monitoring power using SNMP  Networking devices can be moved easily