1. Figure 5 shows the NSFNET backbone architecture.

2. This policy, however, created a need for commercial network providers to bypass the NSFNET backbone as much as possible.

3. TCP/IP network access expanded again in 1986 when the National Science Foundation Network (NSFNet) provided access to supercomputer sites in the United States for researchers, first at speeds of 56 kbit/s and later at 1.5 Mbit/s and 45 Mbit/s.