all over the internet, maybe start by looking here > https://www.google.com/search?q=What+are+the+main+securty+breaches+that+happen+to+wide+area+networks&ie=utf-8&oe=utf-8
What are the main securty breaches that happen to wide area networks and what defence strategies to they have in place?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic