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Difficulty: MediumIPv4 Static Routing

An enterprise router learns the path to a remote subnet 192.168.100.0/24192.168.100.0/24 through EIGRP, which operates with a default administrative distance of 9090. A network engineer needs to configure a backup IPv4 static route to reach this subnet using the next-hop IPv4 address 10.0.5.210.0.5.2 so that the backup route remains inactive until the primary EIGRP path fails. Which Cisco IOS command correctly configures this floating static route?

  1. ip route 192.168.100.0 255.255.255.0 10.0.5.2 95Answer
  2. B
    ip route 192.168.100.0 255.255.255.0 10.0.5.2 85
  3. C
    ip route 192.168.100.0 255.255.255.0 10.0.5.2 90
  4. D
    ip route 192.168.100.0 0.0.0.255 10.0.5.2 95

Answer

The command 'ip route 192.168.100.0 255.255.255.0 10.0.5.2 95' correctly specifies a static route with an administrative distance higher than EIGRP's default AD of 90.
The correct command uses the syntax 'ip route 192.168.100.0 255.255.255.0 10.0.5.2 95'. Because an administrative distance of 95 is higher than EIGRP's default AD of 90, the router keeps this static route in reserve as a floating backup until the primary EIGRP path becomes unavailable.

Step-by-Step Solution

1
Identify the primary routing protocol's Administrative Distance (AD)
EIGRP internal routes have an AD of 90.
Floating static routes require an administrative distance strictly higher than the active primary routing source.
2
Determine the required AD for the floating static route
An administrative distance value greater than 90 (such as 95) is required.
Routes with lower AD values are preferred in the IP routing table. Setting AD > 90 ensures the route stays hidden until the primary route disappears.
3
Verify Cisco IOS static route syntax
Syntax: 'ip route <prefix> <mask> <next-hop-ip> [distance]'.
The subnet mask must be written in standard dotted-decimal format (255.255.255.0), followed by the next-hop IP and the custom AD value.

Key Concept

Floating Static Route Administrative Distance Selection
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Topics

IPv4 Static Routing

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