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Difficulty: MediumIPv4 Static Routing

A network administrator needs to configure static routes on a Cisco IOS router for destination subnet 10.15.0.0/1610.15.0.0/16. The primary route should use next-hop IP address 192.168.1.2192.168.1.2 with default priority. Additionally, a floating static backup route must be configured via next-hop IP address 192.168.2.2192.168.2.2 to take over only if the primary path learned via OSPF (Administrative Distance 110) becomes unavailable. Which two CLI commands correctly configure this static routing behavior? (Select TWO options.)

  1. ip route 10.15.0.0 255.255.0.0 192.168.1.2Answer
  2. ip route 10.15.0.0 255.255.0.0 192.168.2.2 120Answer
  3. C
    ip route 10.15.0.0 255.255.0.0 192.168.2.2 90
  4. D
    ip route 10.15.0.0 0.0.255.255 192.168.1.2

Answer

The correct commands are 'ip route 10.15.0.0 255.255.0.0 192.168.1.2' for the primary static route and 'ip route 10.15.0.0 255.255.0.0 192.168.2.2 120' for the floating static route.
The standard primary static route is configured using subnet mask notation with an implicit administrative distance of 1. To create a floating static route that acts as a backup to OSPF (which has a default administrative distance of 110), the static route must explicitly specify an administrative distance greater than 110, such as 120.

Step-by-Step Solution

1
Determine the syntax for the primary IPv4 static route.
The command syntax is 'ip route <destination-prefix> <subnet-mask> <next-hop-ip>'. For 10.15.0.0/1610.15.0.0/16, this is 'ip route 10.15.0.0 255.255.0.0 192.168.1.2'.
Standard static routes use default administrative distance 1.
2
Determine the administrative distance needed for the floating static backup route.
The backup route must have an administrative distance greater than OSPF (AD = 110), such as 120.
Routes with lower administrative distance are preferred in the routing table. To act as a backup to an OSPF route, the static route AD must exceed 110.

Key Concept

IPv4 Floating Static Route Configuration and Administrative Distance
Estimated Time:1m 30s
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Topics

IPv4 Static Routing

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