In the CCNA Security discipline, we learn about many different security attacks. These include such common issues as Reconnaissance Attacks and the dreaded Distributed Denial of Service (DDoS) attacks. It is understandable that new day zero (brand new and unknown) attacks are always going to take place.
Want a real world example? Facebook just experienced some new day zero problems centered around a class of attack known as a Watering Hole attack. This is where a popular Web site used by an organization is attacked and is able to infect systems that visit that site. This is certainly a scary proposition, especially when you consider that Facebook computers that were infected were fully patched to protect against all known attacks.
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