What command might be part of a working EIGRP configuration on R2 to ensure R1 and R2 become neighbors?

The command that ensures R1 and R2 become neighbors is related to how the Enhanced Interior Gateway Routing Protocol (EIGRP) forms adjacencies between routers. When configuring EIGRP, the "network" command is critical because it tells the router which interfaces to include in the EIGRP process based on the specified IP address range.

In this case, using "network 10.0.0.0" designates that any interface with an IP address that falls within the 10.0.0.0 subnet is to participate in EIGRP. This means that if R1 is within that subnet, it can potentially discover and establish a neighbor relationship with R2. For EIGRP to function correctly, both routers need to be in the same EIGRP Autonomous System (in this example, assumed to be 99) and be on directly connected networks.

Other options do not wholly fulfill the requirement for establishing neighbor relationships as effectively. For instance, specifying a network with a mask (like "10.0.0.2 0.0.0.0") aligns a specific interface to EIGRP but might limit where neighbors can be formed. Similarly, "router eigrp 99" indicates the