Refer to the exhibit. Which route must be configured on R1 so that OSPF routing is used when OSPF is up, but the server is still reachable when OSPF goes down?
A.
ip route 10.1.1.10 255.255.255.255 gi0/0 125
B.
ip route 10.1.1.0 255.255.255.0 172.16.2.2 100
C.
ip route 10.1.1.0 255.255.255.0 gi0/1 125
D.
ip route 10.1.1.10 255.255.255.255 172.16.2.2 100
Answer is A.
At a glance, B has a lower manually set AD of 100.
C command is wrong anyway, if you want to use the interface name instead of the next hop, you use the local router's interface which is R1's g0/0. G0/1 is the next hop to R2.
D has a lower AD than 110.
A has the correct command with a static host route directly to the server, a /32 subnet (host route), the local router's exit interface of g0/0, and a higher manually set AD of 125.
next hop can be specified in 2 ways:
- IP address: must use IP of the next hop router
- Interface: must use local interface connected to the next hop router
this demonic detail answers the question: gi0/0
this is teh interface towards the fateful server 1. the ip route syntax is destination + netmask + next hop. the latter can be replaced bythe interfaceif you want to reach a destination in a more direct manner
Answer is C because we need to configure a floating static route. Cannot use A because that will configure a static route as OSPF does not have a entry for 10.1.1.10 only the network 10.1.1.0/24. In order for a static route to become a floating static route we need the AD to be higher than the OSPF routing protocol so it will not be put into the routing table. If you configure A you will create a static route for 10.1.1.10 in your routing table which is wrong.
By configuring a static address to a /32 address you would create an entry in the routing table. When the router tries to route to the server network it will look for the longest matching prefix which would be the /32 (statically configured route). So it would by pass OSPF because the OSPF network is /24. Although C isn't right either since the interface is incorrect.
Looking back while A is not the right answer it is the best answer.
upvoted 2 times
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