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

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?

  • A Create a default static route with ISP1’s address as the next hop while specifying the addresses for ISP2 and ISP3 as qualified next hops with a preference value of six or higher.
  • B Create a default generate route that includes an import policy to match BGP routes from ISP1 and assign a preference value of four or less.
  • C Create a default static route with each neighbor address as the next hop.
  • D Create a default aggregated route.
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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