Which mechanism reduces convergence time by sending an immediate update when a route changes?

• A. Triggered Updates
• B. Split Horizon
• C. Hold-Down Timers
• D. Route Poisoning

Answer: (A)

Immediate propagation of routing changes is provided by triggered updates. When a route changes, a triggered update is sent right away instead of waiting for the next scheduled update. This brings faster awareness to neighboring routers, allowing them to adjust their routing tables quickly and converge sooner on a consistent view of the network.

Split horizon helps prevent loops by not advertising a route back on the same interface, but it doesn’t accelerate update propagation. Hold-down timers intentionally delay accepting changes to avoid flapping, which slows convergence. Route poisoning advertises an unusable route with an infinite metric to hasten removal, but it’s not the mechanism that delivers an immediate update upon a change.