Ensuring Network Security

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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

• Planning for Network Security
• Security Models
• Security Enhancements
• Computer Viruses

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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

• Companion Virus
• Macro Virus
• Polymorphic Virus
• Stealth Virus

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Symptoms of a Virus

• The computer will not boot.
• The data is scrambled or corrupted.
• The computer operates erratically.
• A partition is lost.
• The hard drive is reformatted.

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Virus Protection Software

• 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

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Maintaining a Healthy Network Environment

• Computers and the Environment
• Creating the Right Environment

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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

• Noise
• Electromagnetic interference (EMI)
• Vibration
• Corrosive and explosive environments
• Untrained and unskilled workers

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Avoiding Data Loss

• Data Protection
• Tape Backup
• Uninterruptible Power Supply (UPS)
• Fault Tolerant Systems
• Optical Drives and Disks
• Disaster Recovery

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Causes of Network Disaster

• 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

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Data Loss Recovery

• Tape backup systems
• An Uninterruptible power supply (UPS)
• Fault tolerant systems
• Optical drives and disks

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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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