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Difficulty: EasyFloating Static Routes

A router receives its primary path to the 172.20.0.0/16 subnet via internal EIGRP. Which administrative distance value should be configured on a static route to ensure it functions as an inactive floating backup route until the primary path fails?

  1. A
    1
  2. B
    10
  3. C
    90
  4. 95Answer

Answer

An administrative distance value of 95 should be specified for the static route.
A floating static route is designed to serve as a backup path that only installs into the IP routing table when the primary route fails. Router forwarding decisions prioritize routes with lower administrative distance (AD) values. Internal EIGRP has a default AD of 90. Assigning a value of 95 ensures the static route has a higher AD than the primary EIGRP route, keeping it dormant until EIGRP route failure occurs.

Step-by-Step Solution

1
Identify the administrative distance of the primary routing protocol.
Internal EIGRP has a default administrative distance (AD) of 90.
Routers use administrative distance to evaluate trustworthiness when selecting the best path among different routing sources.
2
Determine the required administrative distance for a floating static backup route.
The backup static route must have an AD greater than 90 (e.g., 95).
A floating static route remains inactive in the routing table only if its administrative distance is higher than that of the active primary routing protocol.

Key Concept

Floating Static Route Administrative Distance
Estimated Time:45s
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Topics

Floating Static Routes

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