1. Ensuring Network Security Making Networks Secure Maintaining a Healthy Network Environment Avoiding Data Loss 1

2. Making Networks Secure 2 Planning for Network Security Security Models Security Enhancements Computer Viruses

3. Training Reduces User Errors 3

4. Permissions Control Access to a Resource 4

5. Use Windows NT Explorer to Set Permissions 5

6. Modifying Group Permissions 6

7. Common File Infectors 7 Companion Virus Macro Virus Polymorphic Virus Stealth Virus

8. Symptoms of a Virus 8 The computer will not boot. The data is scrambled or corrupted. The computer operates erratically. A partition is lost. The hard drive is reformatted.

9. Virus Protection Software 9 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

10. Maintaining a Healthy Network Environment 10 Computers and the Environment Creating the Right Environment

11. Environmental Extremes Affect Computers 11

12. Include Hidden Components in Environmental Assessment 12

13. Keeping the Computer Cool 13

14. Industrial Considerations 14 Noise Electromagnetic interference (EMI) Vibration Corrosive and explosive environments Untrained and unskilled workers

15. Avoiding Data Loss 15 Data Protection Tape Backup Uninterruptible Power Supply (UPS) Fault Tolerant Systems Optical Drives and Disks Disaster Recovery

16. Causes of Network Disaster 16 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

17. Data Loss Recovery 17 Tape backup systems An Uninterruptible power supply (UPS) Fault tolerant systems Optical drives and disks

18. Reduce Network Traffic by Backing Up to a Separate Segment 18

19. UPS as Backup Power Source 19

20. Disk Striping Combines Areas on Multiple Drives 20

21. Disk Mirroring Duplicates a Partition on Another Physical Disk 21

22. Sector Sparing or Hot-Fixing Steps 22