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Network Sales and Services Handbook by Matthew J. Castelli

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Chapter 19. High Availability Networking

The following topics are covered in this chapter:

  • Measuring Network Availability

  • Internetwork Reliability Options

The term high availability can be nebulous to define because the term itself is considered subjective; what one person or network provider considers to be “high availability” does not necessarily mean the same for another person or network service provider.

High availability is a subjective interpretation of two network availability statistics:

  • Mean-Time-to-Repair (MTTR)—. Average time required to recover/restore from a network outage or repair a failed component.

  • Mean-Time-Between Failure (MTBF)—. Average time a network or component works without failure.

This chapter discusses measuring network availability ...

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