A router has used the OSPF protocol to learn a route to the 172.16.32.0/19 network. Which command will implement a backup floating static route to this network?a, ip route 172.16.0.0 255.255.240.0 S0/0/0 200b, ip route 172.16.32.0 255.255.224.0 S0/0/0 200c, ip route 172.16.0.0 255.255.224.0 S0/0/0 100d, ip route 172.16.32.0 255.255.0.0 S0/0/0 100
The correct answer would be option c, “ip route 172.16.0.0 255.255.224.0 S0/0/0 100”.
To implement a backup floating static route, you need to specify a higher administrative distance (AD) value for the static route. The AD value determines the trustworthiness of a route, with a lower value indicating a more preferred route.
In this case, the router has already learned a route to the 172.16.32.0/19 network using the OSPF protocol. To create a backup static route (floating route), we need to specify a static route for the same network with a higher AD value.
Option c correctly specifies the static route as “ip route 172.16.0.0 255.255.224.0 S0/0/0 100”. The network address is entered as 172.16.0.0 with a subnet mask of 255.255.224.0, which encompasses the 172.16.32.0/19 network. The interface S0/0/0 is the outgoing interface for this route. Lastly, the administrative distance (AD) is set to 100, which is higher than the AD value of OSPF (which is typically 110).
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