What optional EIGRP configurations will be required in order to achieve full connectivity within AS 100?

Refer to the graphic.

What optional EIGRP configurations will be required in order to achieve full connectivity within AS 100?

Refer to the graphic.

What optional EIGRP configurations will be required in order to achieve full connectivity within AS 100?

A.
Use the EIGRP no auto-summary command on R1 and R2.

B.
Use the EIGRP no auto-summary command on R3 and R4.

C.
Use the passive interface on the R1 and R2 interface that connects to the 10.1.1.0/24 and
10.1.2.0/24 subnet respectively.

D.
Use the passive interface command between the R3 and R1 connection and between the R3
and R2 connection.

E.
Use the variance command on R3.

Explanation:
EIGRP automatically summarizes routes at the classful boundary, the boundary
where the network address ends as defined by class-based addressing. In most cases, auto
summarization is a good thing, keeping the routing tables as compact as possible
In the presence of discontiguous subnetworks, automatic summarization must be disabled for
routing to work properly. To turn off auto-summarization, use the following command:
Router(config-router)#no auto-summary



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