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Difficulty: EasyIPv4 Static Routing

Which Cisco IOS command configures an IPv4 floating static route to destination network 172.20.0.0/16172.20.0.0/16 through next-hop IP address 10.0.0.210.0.0.2 so that it serves as a backup to a primary route learned via Internal EIGRP (Administrative Distance of 9090)?

  1. ip route 172.20.0.0 255.255.0.0 10.0.0.2 130Answer
  2. B
    ip route 172.20.0.0 255.255.0.0 10.0.0.2 80
  3. C
    ip route 172.20.0.0 0.0.255.255 10.0.0.2 130
  4. D
    ip route 172.20.0.0 255.255.0.0 10.0.0.2 10

Answer

ip route 172.20.0.0 255.255.0.0 10.0.0.2 130 correctly configures the backup floating static route with an administrative distance higher than the primary EIGRP route.
The command correctly uses the standard subnet mask format for destination network 172.20.0.0/16 and sets an administrative distance of 130. Because 130 is greater than EIGRP's administrative distance of 90, the router keeps this static route inactive in reserve until the primary EIGRP route is lost.

Step-by-Step Solution

1
Identify the proper Cisco IOS static route command syntax.
Syntax is: ip route <destination-prefix> <subnet-mask> <next-hop-ip> [distance]
Cisco IOS requires a subnet mask (255.255.0.0) rather than a wildcard mask.
2
Determine the required Administrative Distance (AD) for a floating static route.
The AD must be greater than 90 (the AD of Internal EIGRP).
Routes with lower AD values are preferred in the routing table. To act as a backup, the static route must have a higher AD so it is only installed when the primary route goes down.
3
Select the command matching both syntax and AD requirements.
ip route 172.20.0.0 255.255.0.0 10.0.0.2 130
130 is greater than 90 and the syntax uses the valid subnet mask format.

Key Concept

IPv4 Floating Static Route Configuration and Administrative Distance Selection
Estimated Time:45s
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Topics

IPv4 Static Routing

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