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Difficulty: MediumIPv4 Static Routing

A network engineer needs to configure a backup IPv4 static route on router HQ-Rtr to reach the remote LAN 10.220.50.0/2410.220.50.0/24. The primary path to this destination is learned via OSPFv2, which has a default Administrative Distance of 110. The backup static path must be routed through the next-hop IP address 192.168.88.2192.168.88.2 and should only be inserted into the IP routing table if the primary OSPF path fails. Which Cisco IOS command must be configured on HQ-Rtr to achieve this design requirement?

  1. ip route 10.220.50.0 255.255.255.0 192.168.88.2 120Answer
  2. B
    ip route 10.220.50.0 255.255.255.0 192.168.88.2 90
  3. C
    ip route 10.220.50.0 255.255.255.0 192.168.88.2 110
  4. D
    ip route 10.220.50.0 0.0.0.255 192.168.88.2 120

Answer

The command 'ip route 10.220.50.0 255.255.255.0 192.168.88.2 120' correctly configures a floating static route with an Administrative Distance higher than OSPF.
The command specifying 'ip route 10.220.50.0 255.255.255.0 192.168.88.2 120' uses valid Cisco IOS syntax and assigns an Administrative Distance of 120. Because 120 is higher than OSPF's default Administrative Distance of 110, the static route remains inactive in the routing table until the primary OSPF path is lost.

Step-by-Step Solution

1
Identify the primary routing protocol and its Administrative Distance (AD).
The primary route is learned via OSPFv2, which has a default AD of 110.
To create a floating (backup) static route, its AD must be higher than the AD of the active primary routing protocol.
2
Determine the required Administrative Distance for the backup route.
An AD greater than 110 (such as 120) must be specified at the end of the static route command.
Routes with lower AD values are preferred. An AD of 120 ensures the route stays out of the routing table until the primary OSPF route disappears.
3
Verify Cisco IOS static route syntax.
Syntax format: 'ip route <destination-prefix> <subnet-mask> <next-hop-ip> [distance]'.
Cisco IOS requires subnet masks in dotted-decimal format (255.255.255.0), not wildcard masks.

Key Concept

Floating Static Route Administrative Distance Selection
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Topics

IPv4 Static Routing

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