An enterprise router learns the remote network 10.50.0.0/16 via OSPF, which has a default … — Cisco CCNA

An enterprise router learns the remote network $10.50.0.0/16$ via OSPF, which has a default administrative distance of 110. A network administrator must configure a floating static backup route to reach destination $10.50.0.0/16$ using next-hop IP address $192.168.12.2$ . The backup route must only enter the routing table if the primary OSPF path fails. Which Cisco IOS command correctly configures this floating static route?

A
ip route 10.50.0.0 255.255.0.0 192.168.12.2 90
B
ip route 10.50.0.0 255.255.0.0 192.168.12.2 110
ip route 10.50.0.0 255.255.0.0 192.168.12.2 120Answer
D
ip route 10.50.0.0 255.255.0.0 192.168.12.2

Answer

The command 'ip route 10.50.0.0 255.255.0.0 192.168.12.2 120' correctly configures the floating static route.

A floating static route acts as a backup path and must remain dormant in the routing table until the primary path fails. Since the primary path is installed by OSPF with an Administrative Distance of 110, the backup static route must be assigned an Administrative Distance higher than 110 (e.g., 120). The command 'ip route 10.50.0.0 255.255.0.0 192.168.12.2 120' fulfills this requirement.

Step-by-Step Solution

Identify the primary routing protocol and its Administrative Distance (AD).

The primary route to

10.50.0.0/16

is learned via OSPF, which has an AD of 110.

Floating static routes rely on AD comparison to remain inactive until primary routes fail.

Determine the required AD for the backup floating static route.

The floating static route must have an AD greater than 110 (such as 120).

Lower AD values are preferred by the router forwarding logic; a higher AD ensures the route stays out of the routing table while OSPF is active.

Construct the Cisco IOS static route command syntax.

'ip route 10.50.0.0 255.255.0.0 192.168.12.2 120'

Syntax requires destination prefix, subnet mask, next-hop IP, and the explicit administrative distance metric at the end.

Key Concept

Floating Static Route Administrative Distance Selection

Estimated Time:1m 30s

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