The following points summarize the key concepts of this chapter:
Making Networks Secure
- Network planning must include plans for security.
- The level of security needed depends on the size of the organization and the sensitivity of the data.
- The two security models that keep data and hardware resources safe are password-protected shares and access permissions.
- Merely requiring users to log on does not, in itself, ensure the security of the network.
- The best way to assign permissions is through setting up groups. Administrators can then assign permissions to the group rather than to individuals.
- Ways to enhance security include use of auditing, diskless computers, data encryption, and virus protection.
- Building in virus prevention and recovery policies should be part of a network strategy.
Maintaining a Healthy Network Environment
- When assessing network environmental conditions and requirements, it is important to consider components that are out of sight, such as wiring, as well as visible components, such as computers.
- Controlling temperature and humidity are key factors in maintaining a user-friendly environment.
- The accumulation of material on and around computers can lead to network failures.
- It is important to be aware of the environmental stresses placed on hidden network components, as well as components in plain view.
Avoiding Data Loss
- Planning for a disaster is an essential part of implementing a successful network.
- A network disaster plan should encompass the loss of hardware and data.
- Tape backup is the most common method of preventing data loss.
- Loss of electrical power can causes files to become corrupted, and any data being held in RAM to be lost.
- An uninterruptible power supply provides temporary power so that critical data can be properly stored before the network or computer goes down.
- Fault tolerance is the automatic duplication of data to prevent loss.
- Fault tolerant strategies are called redundant arrays of independent disks (RAID) and include disk striping and disk mirroring.
- Sector sparing is an advanced method of fault tolerance.