300-320 Question #382: Real Exam Question with Answer & Explanation

The correct answer is A: route summary. When an uplink is in a 'floating state' (continuously going up and down, also called route flapping), route summarization (route summary) is the recommended solution. By aggregating multiple specific routes into a single summary route, the summary remains stable and advertised to

Question

Uplink floating state ( up and down ). What you can do to solve this problem?

Options

Aroute summary
BCisco Express Forwarding
CBFD
DUDLD

Explanation

When an uplink is in a 'floating state' (continuously going up and down, also called route flapping), route summarization (route summary) is the recommended solution. By aggregating multiple specific routes into a single summary route, the summary remains stable and advertised to neighbors even if individual component routes flap. This prevents the instability from propagating throughout the network and reduces unnecessary routing updates. BFD detects failures quickly but does not suppress flapping; UDLD addresses unidirectional link issues; CEF is a forwarding mechanism, not a stability solution.

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