1) BGP allows you to communicate with other networks that have different routing policies. If you were to communicate with those same networks by using IGP, both locations need to agree on their routing policies.
BGP also allows you to run more routes than IGPs.
2) EIGRP uses both (network & neighbor). I don't understand the question.
In eigrp (and most other routing protocolls) you can add neighbors staticaly. Thats what you need the neighbor command for. You may need this feature on Media where EIGRP cannot find it's neighbor via MCast (and in many CCIE Lab Studies :-) ).
The network command is to announce certain prefixis with EIGRP or any other IGP. The network command is also used to switch the routing protocol on on the interfaces covered by the network statement. That's not true for OSPFv3 and BGP!
The differences between IGP/BGP is as explained, but you need to run a IGP within each Autonomous System to announce the BGP Next Hops and to build the BGP neighborships.
Network x.x.x.x is used to tell the router to advertise (multicast) the network x.x.x.x. The network command is used for each of the networks that the router is connected to and is a part of the EIGRP network.
Neighbor x.x.x.x cmd is used to define a neighboring router with which to exchange routing information. EIGRP exchanges routing information with the neighbors in the form of unicast packets whenever the neighbor command is configured for an interface. EIGRP stops processing all multicast packets that come inbound on that interface. Also, EIGRP stops sending multicast packets on that interface.
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