Well Abr stands for Area border router. Area 0 is a very special area in ospf which has the capability of sharing inter area routes. Abr is some thing in which at least one of its interface is connected to area 0. If incase you are not able to connect to area 0 physically you can do so logically by using the concept of ospf virtual link.  Asbr stands for autonomous system boundary router when ev... (more)

We can’t compare routing protocols like this. Both protocols are different and their behavior is totally different as EIGRP is distance vector and OSPF is link state. If you are asking which protocol you can deploy in your enterprise, it will depend on various factors because no full routing protocol is better over another. Factors that decides which protocols to use: 1-Convergence time 2-Config... (more)