Learn the correct command to set up a backup route from R1 to R2’s LAN network using a floating static route. Understand IP addressing, subnetting and administrative distance to configure proper redundancy.
Table of Contents
Question
Refer to the exhibit.
A secondary route is required on router R1 to pass traffic to the LAN network on R2 if the primary link fails. Which command must be entered to configure the router?
A. ip route 10.0.2.0 255.255.255.240 10.0.0.7 92
B. ip route 10.0.2.0 255.255.255.240 10.0.0.6 91
C. ip route 10.0.2.0 255.255.255.248 null0 93
D. ip route 10.0.2.0 255.255.255.248 10.0.0.6 91
Answer
To configure a secondary (backup) route on R1 to reach R2’s LAN network (10.0.2.0/29) in case the primary link fails, the correct command is:
D. ip route 10.0.2.0 255.255.255.248 10.0.0.6 91
Explanation
Here’s why:
- The destination network is R2’s LAN which is 10.0.2.0/29. This matches the network and mask in option D.
- The next-hop IP should be R2’s IP on the link between R1 and R2, which is 10.0.0.6 as shown in the exhibit. Option D uses this next-hop.
- The administrative distance (AD) needs to be higher than the primary route’s AD of 90. An AD of 91 will make this a backup “floating” static route. Option D uses AD 91.
Options A and B use an incorrect subnet mask of /28 for the 10.0.2.0 network, which is actually a /29.
Option C specifies a null0 interface instead of a real next-hop, which would discard traffic rather than route it.
So in summary, option D will correctly configure R1 with a secondary route to R2’s LAN using the correct network, mask, next-hop and administrative distance to serve as a backup route if the primary path fails.
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