JN0-351: Enterprise Routing and Switching, Specialist (JNCIS-ENT)

By Juniper · Question Mode

QuestionQ3

OSPF

You need to create a default route that will be advertised to your internal OSPF neighbors. You have three upstream Internet connections and must ensure that, whenever available, all traffic uses ISP1 as the primary connection, using ISP2 and ISP3 only when ISP1 is unavailable.

Which solution should you implement for this scenario?

Explanation

A static default route with ISP1 as its ordinary next hop and ISP2 and ISP3 as qualified next hops provides primary/backup forwarding. Junos selects the next hop with the lowest preference; the static route’s default preference is 5, so qualified next hops assigned preferences of 6 or higher are used only when the ISP1 path is no longer usable. The resulting static default route can be advertised to internal OSPF neighbors.

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