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Difficulty: EasyIPv4 Static Routing

A network administrator needs to configure a floating static route on a Cisco router to act as a backup link for a primary path learned via OSPF (Administrative Distance of 110). Which Administrative Distance value must be assigned to the floating static route to ensure it is used ONLY when the primary OSPF route becomes unavailable?

  1. 120Answer
  2. B
    90
  3. C
    1
  4. D
    110

Answer

The floating static route must be configured with an Administrative Distance greater than 110 (such as 120).
For a static route to function as a floating static route (backup), its Administrative Distance must be configured to a value higher than that of the primary route protocol. Since OSPF has an AD of 110, an AD of 120 ensures the static route remains out of the routing table until the OSPF route fails.

Step-by-Step Solution

1
Identify the Administrative Distance (AD) of the primary dynamic route.
The primary route is learned via OSPF, which has a default AD of 110.
Routers prefer routes with lower AD values when installing paths into the routing table.
2
Determine the AD requirement for a backup (floating) static route.
The floating static route must have an AD higher than 110 (for example, 120).
Assigning a higher AD keeps the backup route inactive ('floating') until the lower AD primary route disappears from the routing table.

Key Concept

Floating Static Route Administrative Distance Selection
Estimated Time:45s
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Topics

IPv4 Static Routing

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