You are a senior network administrator managing your company's data center.
Upon receiving complaints from server team that yesterday there were multiple short network cuts that impacted some very sensitive applications running in the data center, you investigate and find out that one of the level 1 network engineers performed the following changes on these 4 switches:

  • he created a new vlan 200 on all 4 switches
  • he added vlan 200 to instance 2 on all switches in this order: Acc-1 -> Acc-2 -> Dist-1 -> Dist-2

Note: the trunks between the switches allow all vlans!

Considering the actions performed by the junior engineer,
1. how can you explain the network cuts ?
2. how could have he performed the task (to assign new vlan 200 to instance 2) without any network cut ?

Post your answer in the 'Comments' section below and subscribe to this blog to get the detailed solution and more interesting quizzes.