Refer to the exhibit. Router R3 is receiving multiple routes through the EIGRP routing protocol. Which statement is true about the implementation of summarization in this network?
- Automatic summarization has been enabled only for the 172.21.100.0/24 network.
- Automatic summarization is disabled on R3.
- Automatic summarization is enabled on neighboring routers.
- Automatic summarization is disabled on a per-interface basis.
Explanation: Automatic summarization is disabled on R3, so no routes to the null0 interface have been created for networks 172.21.0.0/16 and 192168.254.0/24. If automatic summarization had been enabled on R3 neighbors, the networks that were received by R3 would have been summarized classful statements.
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