Refer to the exhibit. After the configuration shown is applied on router R1, the exhibited status message is displayed. Router R1 is unable to form a neighbor relationship with R2 on the serial 0/1/0 interface. What is the most likely cause of this problem?

Refer to the exhibit. After the configuration shown is applied on router R1, the exhibited status message is displayed. Router R1 is unable to form a neighbor relationship with R2 on the serial 0/1/0 interface. What is the most likely cause of this problem?

• The passive-interface command should have been issued on serial 0/1/0.
• The hello interval has been altered on serial 0/1/0 and is preventing a neighbor relationship from forming.
• The network statement used for EIGRP 55 does not enable EIGRP on interface serial 0/1/0.
• The IPv4 address configured on the neighbor that is connected to R1 serial 0/1/0 is incorrect.
• The networks that are configured on serial 0/0/0 and serial 0/1/0 of router R1 are overlapping.

Explanation: According to the status message, serial 0/1/0 is receiving EIGRP packets coming from the IPv4 address 192.168.254.9. This IPv4 address is on a different subnet in contrast to the IP address configured on serial 0/1/0 of R1. The passive-interface command would have prevented any neighbor relationship from forming if the command was issued on serial 0/1/0. Changing the hello interval on one router and not another will not cause an EIGRP neighbor relationship to fail.

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