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What is the difference between redundancy at the physical and logical layers?
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  • What is the difference between redundancy at the physical and logical layers?

What is the difference between redundancy at the physical and logical layers?

Physical redundancy is about diverse cables, conduits, and entry points; logical redundancy is about diverse routing decisions, BGP policies, and traffic engineering. Both are needed for true resilience because a perfectly redundant physical path can still fail logically through misconfiguration. The strongest designs treat physical and logical redundancy as complementary requirements rather than alternatives.

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