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Graduate Program : I have a very active and international graduate student program . A hacker could use a publicly available tool such as nessus ( http://www.nessus.org ) and identify which vulnerability to exploit to carry the attack . Inevitably , a shy person with exotic knowledge of a critical function was terminated by a smart person who did n't understand how the organization really worked . A hacker could use a publicly available tool such as nmap ( http://www.insecure.org ) to find information about the OS ( probing ) of the target host as well as the services configured on the server ( scanning ) . A. Service Layer OAM focuses on the " end-to-end " connectivity of an Ethernet virtual circuit . They look a lot like the first group but are either led by someone who understands how screwed up things are or have a cluster of professionals who are trying to change things . While you could claim that HotJobs is more exclusive , you could also say that it is home to more passive hunters ; you could also claim that loyalty was evidence of success . A. Cisco Ethernet FTTH provides a lower incremental subscriber cost , greater service flexibility , and a more robust , resilient solution with more bandwidth per subscriber readily available for future services . The first two are relatively straightforward and well understood from a security standpoint . A. A. Triple-play services to consumers with high-definition video , video on demand ( VoD ) , and interactive broadband media applications are accelerating the need for bandwidth , and FTTH provides a number of solutions to reduce congestion in the last mile . Created by Louis A. Bloomfield , Professor of Physics , University of Virginia . Should another device be inserted into the STP domain with a lower STP bridge priority or a lower ordered MAC Address ( when having the same priority as the STP root ) , it could take over as the STP root changing the STP topology to a less efficient communication path . As an example the number of hosts infected by the " SQL slammer " worm doubled every 8.5 seconds and the traffic that it generated could grow to saturate a 1-Gbps link in less than a minute .