There are now a large number of backbone and mid-level networks in other countries. For example, most western European countries have national networks that are attached to EBone, the European backbone. The infrastructure is still immature, and quite inefficient in some places. For example, the connections between other countries often are slow or of low quality, so it was common to see traffic between two countries that is routed through the NSFNET in the U.S. [Braun and Claffy1993].