Internship in Network Security Essay

Internship in Network Security Essay

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During my internship I worked in the Network Security Operations Center (NSOC), which is in charge of the network stability of the network. NSOC’s focus is to ensure the integrity of MCI’s network and systems as well as the protection of its strategic and intellectual assets through an ongoing concerted program of prevention, detection, investigation and response to fraud and abuse. There is also a team that was more involved with inside of NSOC which is called the Incidence Response Operations Center (IROC). The projects that I took place in were to respond specifically to network security alarms generated by the intrusion detection sensors that are located within the MCI network. These sensors examine packets of data and determine suspicious activity based upon past experience as well as customized triggers. The IROC response capability allows all network security incidents to be analyzed and the appropriate responses initiated as determined by the event’s level of risk. In addition, the IROC security knowledge base, which stores previous incident resolutions, resides within one organization and helps the planning of future security solutions as determined by trending of the actual security alarms. The IROC security analysts utilize an alarm system that presents the alarms with detailed information. It includes the sensor location, signature number, a description of the alarm, a source and destination IP address, severity level, and the date and time stamp. The security analyst investigates the alarm starting with the knowledge base entry if this exists. A knowledge base entry is a resolution that was previously implemented to resolve this type of alarm. If there is no knowledge base entry then the analyst begins to investigate ...


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...ures that they use to monitor the network and they felt like several of them which was created years ago may not be needed are might even needed to be modified to fit the network operations of today. This was very difficult starting off trying to apply the knowledge about signatures that I was taught and what I read. I had to rely on a few of our senior engineers to help get through the first couple of signatures and then after I got the hang of it became evident of what I need to do. I was in charge of dissecting thirty signatures and on twenty-two of them changes was made to them regarding the results of my project. There are hundreds of thousands alarms a day and through my results that cut the IDS from triggering on over ninety-five thousands plus alarms. With this such of decline in false positive alarms will make the job for the IROC team easier after I am gone.

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