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单项选择题 Refer to the exhibit. EIGRP has been configured on routers R1 and R2. However， R1 does notshow R2 as a neighbor and does not accept routing updates from R2. What could be the cause ofthe problem？（）

A、The no auto-summary command has not been issued under the EIGRP process on bothrouters

B、Interface E0 on router R1 has not been configured with a secondary IP address of 10.1.2.1/24

C、EIGRP cannot exchange routing updates with a neighbor’s router interface that is configuredwith two IP addresses

D、EIGRP cannot form neighbor relationship and exchange routing updates with a secondaryaddress

  • D

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