Audit trails and emergency procedures audit trails

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Audit Trails and Emergency Procedures Audit Trails – log of events, systems may have many audit logs each capturing specific information n Access logs should contain: n Date and Time Access attempted n Whether the attempt was successful or not n Where was access granted (which door) n Who attempted Access n Who modified access privileges at the supervisor level n Some trails can send alerts n Audit Trails are detective not preventative Emergency Procedures Clearly documented, readily accessible and updated periodically n Should include: n Emergency Shutdown procedures n Evacuation procedures n Employee training, awareness and periodic drills n Periodic System tests Administrative Personnel Controls Implemented commonly by the HR department during hiring and firing n Pre-employment screening n Employment references, educational history n Background checks, credit n On going employee checks n Security clearances – if required n Ongoing evaluations and reviews n Post-employment n Exit interview n Removal of network access n Return of computer inventory, laptops Environmental and Life Safety Sustain computer and personnel operating environment Three focus areas: n Electrical power n Fire detection and suppression
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n Heating Ventilation and Air Conditioning Electrical power Electrical Power Terminology Description Fault Momentary loss of power Blackout Complete loss of power Sag Momentary low voltage Brownout Prolonged low voltage Spike Momentary high voltage Surge Prolonged high voltage Inrush Initial surge of power Noise Steady interference Transient Short duration of line noise Clean Non-fluctuating power Ground One wire is grounded Clean steady power supply - Most common threats are noise, brown outs, and humidity Noise - Presence of electrical radiation in the system interferes with distribution of clean power Several Types of Noise: n Most common is Electromagnetic Interference (EMI) and Radio Frequency Interference (RFI) n EMI is caused by the generation of radiation due to charge differences between the hot, neutral and ground wires. n Two common types of Electromagnetic Interference - EMI are: n Common Mode noise - the generation of radiation due to charge differences between the hot and ground wires n Traverse Mode Noise: the generation of radiation due to charge differences between the hot and neutral wires n Radio Frequency Interference (RFI) is generated by the components of an electrical system, can damage equipment Protective measures for noise: n Power Line Conditioning n Proper Grounding n Cable shielding n Limiting exposure to magnets, fluorescent lights, motors and space heaters Brownouts Brownout is a prolonged drop in supplied usable voltage; can do serious damage to sensitive equipment n American National Standards Institute allows: n 8% drop between building meter and the power source n 3.5% drop from the meter to the wall n Surges and spikes as power comes back on line can also cause problems.
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