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Difficulty: MediumIPv4 Static Routing

A Cisco router relies on OSPF (administrative distance 110) to reach destination network 192.168.10.0/24192.168.10.0/24. A backup path is connected via next-hop IPv4 address 10.0.0.210.0.0.2. The network engineer must configure a floating static route so that traffic uses this secondary link only when the primary OSPF path becomes unavailable. Which command correctly configures this backup static route?

  1. ip route 192.168.10.0 255.255.255.0 10.0.0.2 120Answer
  2. B
    ip route 192.168.10.0 255.255.255.0 10.0.0.2 90
  3. C
    ip route 192.168.10.0 255.255.255.0 10.0.0.2
  4. D
    ip route 192.168.10.0 0.0.0.255 10.0.0.2 120

Answer

The command 'ip route 192.168.10.0 255.255.255.0 10.0.0.2 120' correctly configures the floating static route.
The command specifying 'ip route 192.168.10.0 255.255.255.0 10.0.0.2 120' uses proper Cisco IOS syntax with a subnet mask and assigns an administrative distance of 120. Because 120 is higher than OSPF's administrative distance of 110, the route will stay out of the routing table until the OSPF route is lost.

Step-by-Step Solution

1
Identify the primary routing protocol's Administrative Distance (AD)
OSPF has an AD of 110.
Floating static routes must have an AD strictly higher than the primary routing protocol to remain inactive while the primary route is present in the routing table.
2
Verify Cisco IOS static route command syntax
Syntax: 'ip route <destination-network> <subnet-mask> <next-hop-ip> [distance]'.
Cisco static routes require a dotted-decimal subnet mask (e.g., 255.255.255.0) rather than a wildcard mask.
3
Select the correct Administrative Distance value
An AD of 120 is greater than 110.
Setting the AD to 120 ensures the static route remains floating in backup state until the primary OSPF route (AD 110) fails.

Key Concept

Floating Static Route Administrative Distance
Estimated Time:1m 15s
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Topics

IPv4 Static Routing

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