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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