In the fields of computer and network

the heterogeneity of systems and networks has arisen due to several reasons.The studies onteconnection

interworking

interoperation between heterogeneous networks have

therefore

attracted the extensive attention. In this paper

we give our opinions and understanding of some important concepts relative to this studies

e.g.network interconnection

internetworking

interworking

interoperation

and network intercennectionrarchitecture

etc.These would be helpful to the related research.