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When EIGRP returns a stuck in active (SIA) message, it means that it has not received a reply to a query. EIGRP sends a query when a route is lost and another feasible route does not exist in the topology table. The SIA is caused by two sequential events:
1.The route reported by the SIA has gone away.
2.An EIGRP neighbor (or neighbors) have not replied to the query for that route.
When the SIA occurs, the router clears the neighbor that did not reply to the query. When this happens, determine which neighbor has been cleared. Keep in mind that this router can be many hops away.
Q - Describe the process of routing packets.
A - Routing is the act of moving information across an internetwork from a source to a destination.
Q - What are some routing algorithm types?
A - Static, dynamic, flat, hierarchical, host-intelligent, router-intelligent, intradomain, interdomain, link-state, and distance vector.
Q - Describe the difference between static and dynamic routing.
A - Static routing is configured by the network administrator and is not capable of adjusting to changes in the network without network administrator intervention. Dynamic routing adjusts to changing network circumstances by analyzing incoming routing update messages without administrator intervention.
Q - What are some of the metrics used by routing protocols?
A - Path length, reliability, delay, bandwidth, load, and communication cost.
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