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Difficulty: EasyFloating Static Routes

A network administrator needs to configure a backup static route to destination network 192.168.50.0/24 via next-hop IP address 10.1.1.2. The primary route to this network is learned dynamically through OSPF, which has a default administrative distance of 110. Which command correctly configures a floating static route that remains inactive in the routing table until the primary OSPF route fails?

  1. ip route 192.168.50.0 255.255.255.0 10.1.1.2 120Answer
  2. B
    ip route 192.168.50.0 255.255.255.0 10.1.1.2 90
  3. C
    ip route 192.168.50.0 255.255.255.0 10.1.1.2
  4. D
    ip route 192.168.50.0 255.255.255.0 10.1.1.2 100

Answer

The command 'ip route 192.168.50.0 255.255.255.0 10.1.1.2 120' correctly configures the floating static route.
A floating static route acts as a backup path and must be configured with an administrative distance higher than the primary route's protocol. Because OSPF has a default administrative distance of 110, setting the static route's administrative distance to 120 ensures it stays out of the routing table until the primary OSPF path fails.

Step-by-Step Solution

1
Determine the administrative distance of the primary routing protocol
OSPF has a default administrative distance of 110.
A floating static route must have a higher administrative distance than the primary route to remain inactive while the primary route is operational.
2
Select an administrative distance value for the static route higher than 110
The value 120 is greater than 110.
Specifying 120 at the end of the 'ip route' command creates a floating static route that only enters the routing table if the OSPF route (110) disappears.

Key Concept

Floating Static Routes and Administrative Distance
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Topics

Floating Static Routes

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