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Security Plus Notes

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Submitted By etgarcia
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Chapter 1: Measuring and Weighing Risk
Risk Assessment
Risks to which the organization is exposed
Allows you to develop scenarios that can help evaluate how to deal with risks
Ex. An OS, server, or application may have known risks in certain environments
Create a plan for your organization.
Risks that need addressing
Risk assessment components allows the organization to provide a reality check on real risks and unlikely risks.
Ex. Industrial espionage and theft are likely, but a risk of a pack of dogs stealing contents of payroll files is low, therefore resources should be allocated to prevent espionage. * Computing Risk Assessment
Prioritize
Measurements of risk assessment
Annualized rate of Occurrence (ARO)
This is the likelihood, often drawn from historical data, of an event occurring within a year.
Used in conjunction with monetary value assigned to compute Single Loss Expectancy (SLE) and Annual Loss Expectancy (ALE).
Risk Assessment formula
SLE x ARO = ALE
You can expect that every SLE, which is equal to Asset Valve (AV) times Exposure factor (EF), will equivalent to $1000 and that there will be seven occurrences in a year (ARO), the ALE is $7000. Conversely if there is only a 1- % chance of an event occurring in a year (ARO=0.1) then the ALE Drops to 100.
Examples:
You are the administrator of a web server that generates $25,000 per hour in revenue. The probablility of the web server failing is estimated to be 25 percent, and a failure would lead to 3 hours of downtime at a cost of $5000 in components to correct. What is ALE?
The SLE is $80,000 (25,000 x 3 hours + 5,0000), and the ARO is .25. therefore ALE is 20,000 ($80,000 x .25).
You’re the administrator for a research firm that works on only one project at a time and collects data through the web to a single server. The value of each research project is approx. $100,000. At any

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