Appendix D. Solutions to Selected Exercises

Chapter 1

1.1	Calculate the maximum number of class A, B, and C network IDs.
A1:	The value is 2⁷ – 2 (126) plus 2¹⁴ - 2 (16,382) plus 2²¹ – 2 (2,097,150) for a total of 2,113,658. We subtract 2 in each calculation since a network ID of all zero bits or all one bits is invalid.
1.2	Fetch the file `nsfnet/statistics/history.netcount` using anonymous FTP (Section 27.3) from the host `nic.merit.edu`. This file contains the number of domestic and foreign networks announced to the NSFNET infrastructure. Plot these values with the year on the x-axis and a logarithmic y-axis with the total number of networks. The maximum value for the y-axis should be the value calculated in the previous exercise. If the data shows ...

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