Multiple choice

Refer to the exhibit. The 10.4.0.0 network fails. What mechanism prevents R2 from receiving false update information regarding the 10.4.0.0 network?

  1. split horizon

  2. hold-down timers

  3. route poisoning

  4. triggered updates
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Split horizon is a mechanism that prevents a router from advertising a route back out the same interface through which it was learned. When the 10.4.0.0 network fails, R2 would receive information about it from R1. Without split horizon, R2 might advertise this route back to R1, causing routing loops or confusion. Split horizon prevents this by not advertising the route back toward its source. Hold-down timers (B) suppress route updates for a period, route poisoning (C) marks routes as unreachable, and triggered updates (D) send immediate notifications.

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