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ether channel configuration ether channel how to configure port security info grapic template. prefix size useable host class-b class-a subnet calculation ip subnetting for ipv4 difficult of recovering data limited writing/deleting cycle poor lifespan unique file system structure ssds are more expensive disadvantage of ssd bridgeid+ mac address stp switch election stp configuration stp commands bridge id port priority disabled state blocking state forwarding state learning state listening state port state loogguard bpduguard bpdus root guard root port root bridge spanning tree protocol stp vlan configuration dtp configuration vtp configuration vlan dtp vtp database load balance count in router bandwidth calculation computer mamory units bit/byte calculation dns port number tcp ip port network port network concept of ether channel ether channel tutorial ether channel interview question osi network model osi layers network layers