09-CCNP Switch 300-115 (Lecture 9 ) By Eng-Ahmed Nazmy | Arabic • Introduction to Spanning-Tree • Spanning-Tree Cost Calculation • PVST (Per VLAN Spanning Tree) • Spanning-Tree TCN (Topology Change Notification) https://www.facebook.com/free4arab http://www.free4arab.com https://twitter.com/free4arab1 https://plus.google.com/113503705132872627915 نور الهدى لتكنولوجيا المعلومات