What is meant by a control plane that is based on per-router control? In such cases, when we say the network control and data planes are implemented "monolithically." what do we mean?

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What is meant by a control plane that is based on per-router control? In such cases, when we say the network control and data planes are implemented "monolithically." what do we mean?

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What is meant by a control plane that is based on per-router control? In such cases, when we say the network control and data planes are implemented "monolithically." what do we mean?

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