You work for a large enterprise network that spans many remote locations and uses EIGRP as its only routing protocol. Recently, the network grew too rapidly and it is having a lot of SIA problems…

Secondary networks do not cause or contribute to SIA problems; SIA is driven by excessive query propagation and slow reply times, which are unrelated to secondary IP address configuration.

EIGRP Wide Metrics increases metric granularity for interfaces above 1 Gbps to avoid metric saturation, but it does not affect the query-reply process or address SIA conditions.

Duplicate router IDs cause LSA conflicts in OSPF; in EIGRP, router IDs are used only for loop prevention in external routes and have no bearing on SIA behavior.

Route summarization creates query boundaries in EIGRP - when a specific route goes active, queries are contained within the summarization boundary and cannot flood the entire network, directly reducing the chance of a query timing out and causing an SIA condition.

EIGRP Stub routing marks remote routers so that hub routers never send them queries; stub routers only advertise connected and summary routes back, eliminating them as participants in the query process and preventing SIA at remote sites.