To hear the official Rogers explanation, the nationwide system failure that cascaded across the country last Friday happened during a maintenance update. I'm no IT expert, but I know enough to know that maintenance updates are routine. How could the "routine" have caused such a collosal collapse? Today on The Daily Brief, we continue with our cyber-security series 1 CLICK 2 CYBER CHAOS. We focus on the vulnerablilty and resilience of critical infrastructure. How much of a threat is there? Host Kym Geddes is joined by Greg Markel, CEO at Ridge Canada and veteran broadcast journlist Kevin Newman.

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