Refer to the exhibit.
Prior to implementing OSPF on the network, an ArubaOS switch had the IP routing table shown in the exhibit. The network administrator then sets up OSPF in the network. The switch calculates these OSPF routes to 10.1.20.0/24:
• Through 10.1.0.1 with cost 3 and administrative distance 110
• Through 10.1.0.2 with cost 3 and administrative distance 110
How does the way the switch handles traffic destined to 10.1.20.0/24 change with the introduction of OSPF?
A. The switch stops sending the traffic to 10.1.0.3 and instead load balances it to 10.1.0.1 and 10.1.0.2.
B. The switch no longer drops this traffic and instead load balances it to 10.1.0.1 and 10.1.0.2.
C. The switch continues to send the traffic to 10.1.0.3, but it now has backup routes for the traffic in case the connection to 10.1.0.3 fails.
D. The switch no longer drops this traffic and instead sends it to 10.1.0.1.
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Can anyone explain this answer?
Thank you.
Before introducing OSPF there is no specific entry for 10.1.20.0/24 so the default route over 10.1.0.3 is used.
After introducing OSPF the routing table contains 2 additional entries:
10.1.20.0/24 via 10.1.0.1 ad110, me3
10.1.20.0/24 via 10.1.0.1 ad110, me3
The router prefers specific entry over default, so it stops using the default.
The two entries have the same AD and metric i.e. they are equally good, so load balancing is introduced.