Lecture Networking essentials plus (3 e) Chapter 10 Ensuring network security

Ensuring Network Security
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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

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Training Reduces User Errors

3

Permissions Control
Access to a Resource

4


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

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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.

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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

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Maintaining a Healthy
Network Environment
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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
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Noise
Electromagnetic interference (EMI)
Vibration
Corrosive and explosive environments
Untrained and unskilled workers

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Avoiding Data Loss
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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
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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
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Data Loss Recovery
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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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