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By Rob Cameron

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Sample text

Structured attacks are more worrisome because they are conducted by hackers with significant skill. They are able to discover new vulnerabilities in systems by executing complex actions that the system designers did not protect against. Structured attackers often use so-called zero-day exploits, which are exploits that target vulnerabilities that the system vendor has not yet issued a patch for or does not even know about. These motivations or goals can include theft of source code, theft of credit card numbers for resale or fraud, retribution, or destruction or disruption of a competitor.

In this section how Ethernet functions will be focused on. As of the time of this writing the main layer two protocol that is used by NetScreen firewalls is Ethernet. Ethernet is the most commonly used medium today in corporate networks. com 17 18 Chapter 1 • Networking, Security, and the Firewall data link layer is used to communicate across the local medium. 7 shows the breakdown of the use of layers and where they take place during system-tosystem communication. When systems need to talk over Ethernet, they cannot use IP addresses, because Ethernet is at a lower level and it is used to move IP between layer three devices.

You boot up your computer, and immediately some pit-bull of a virus starts attacking your PC. You send some e-mail to a co-worker in a remote location, and a hacker with a God complex decides to read it, gets some critical information and ruins your next product release. How about this? You’re in charge of your corporation’s website running 24/7 and your firewall fails while you’re fast asleep, causing thousands or millions of dollars in lost revenue. These may sound silly, but unfortunately they happen every day.

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