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Ensuring Network Security Making Networks Secure Maintaining a Healthy Network Environment Avoiding Data Loss
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Making Networks Secure
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Planning for Network Security Security Models Security Enhancements Computer Viruses
Training Reduces User Errors
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Permissions Control Access to a Resource
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Use Windows NT Explorer to Set Permissions
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Modifying Group Permissions
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Common File Infectors
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Companion Virus Macro Virus Polymorphic Virus Stealth Virus
Symptoms of a Virus
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The computer will not boot. The data is scrambled or corrupted. The computer operates erratically. A partition is lost. The hard drive is reformatted.
Virus Protection Software
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Warns of a potential virus Keeps a virus from activating Removes a virus Repairs some of the damage that a virus has
caused Keeps a virus in check after it activates
Maintaining a Healthy Network Environment
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Computers and the Environment Creating the Right Environment
Environmental Extremes Affect Computers
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Include Hidden Components in Environmental Assessment
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Keeping the Computer Cool
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Industrial Considerations
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Noise Electromagnetic interference (EMI) Vibration Corrosive and explosive environments Untrained and unskilled workers
Avoiding Data Loss
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Data Protection Tape Backup Uninterruptible Power Supply (UPS) Fault Tolerant Systems Optical Drives and Disks Disaster Recovery
Causes of Network Disaster
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Component failure Computer viruses Data deletion and corruption Fire caused by arson or electrical mishaps Natural disasters, such as lightning, floods,
tornadoes, and earthquakes Power-supply failure and power surges Theft and vandalism
Data Loss Recovery
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Tape backup systems An Uninterruptible power supply (UPS) Fault tolerant systems Optical drives and disks
Reduce Network Traffic by Backing Up to a Separate Segment
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UPS as Backup Power Source
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Disk Striping Combines Areas on Multiple Drives
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Disk Mirroring Duplicates a Partition on Another Physical Disk
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Sector Sparing or Hot-Fixing Steps
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