What is route redistribution and a potential risk when performing it between protocols?

• A. Moving routes from one routing protocol to another; risk includes routing loops and suboptimal paths if metrics are misconfigured.
• B. Relaying MAC addresses between frames.
• C. Injecting traffic into a network.
• D. Changing interface IP addresses.

Answer: (A)

Route redistribution means taking routes learned by one routing protocol and advertising them into another protocol so different parts of the network can share reachability information. This is useful when parts of the network run different protocols but still need to reach the same destinations.

The best answer highlights a key risk: routing loops and suboptimal paths if metrics aren’t configured correctly. Different protocols use different metric schemes and decision rules, so when you move a route into another protocol you must translate or adjust its metric and apply controls to prevent the same route from bouncing back across the boundary. Without proper tagging and filtering, a redistributed route can re-enter the original protocol and create loops or instability. Proper safeguards include route tagging, route maps or distribution lists, and careful metric and administrative distance adjustments to ensure the most reliable path is chosen.

Other options describe concepts that aren’t about inter-protocol routing—MAC addressing in frames, injecting traffic, or changing interface IPs.