Two US airlines recently suffered major network outages recently that left flights grounded and caused delays for tens of thousands of passengers. These incidents remind us that even the slightest change or error in configuring security policies can bring an entire organization to its knees. Yet security changes are made to devices on a daily basis, whether these are alterations to filtering rules or changes to the traffic routing – networks are in a constant state of change. So what can you do to prevent these outages and minimise their impact when they do happen?

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