The first line of defense in cybersecurity is taking proactive measures to detect and protect the entire IT landscape. It’s critical to have the right security systems and processes in place to  find known and unknown threats before they impact your business. But you also need a bulletproof plan in case your systems are breached. You need to move very quickly to limit damage, so you should have a team experienced in handling these situations ready to jump to action, bringing along tools, procedures, and a proven methodology to stop attacks and to repair and restore whatever you can. Here are five critical factors in preparing for the first 24 hours after an attack: