Which of the following stability features are associated with IGRP?

The correct answer relates to the characteristics of Interior Gateway Routing Protocol (IGRP) in maintaining stability within a routing environment. Specifically, IGRP utilizes split horizons and holddown timers to combat routing loops and ensure that the routing information remains accurate and updates are appropriately controlled.

Split horizon is a technique used to prevent routing loops by prohibiting a router from advertising a route back out of the interface from which it was learned. This principle helps maintain stability by ensuring that routing information doesn't lead to incorrect routing decisions.

Holddown timers are used to prevent a router from accepting any new, potentially erroneous routing information for a specified period after it has learned that a route is down. This allows sufficient time for the network to stabilize and for the converging information to settle, thus preventing the router from potentially flapping between different routes.

These mechanisms work together to enhance the reliability and stability of routing tables within IGRP, making sure that changes in the network topology don't lead to instability and incorrect packet delivery.

The other options include terms and features not specifically associated with IGRP's stability mechanisms, such as poison reverse updates, which is a characteristic of other protocols like RIP, and load balancing, which, while a concept in routing, does not directly define