Exercises

Exercises

1.1	Calculate the maximum number of class A, B, and C network IDs.
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 a visual trend, extrapolate the values to estimate when the current addressing scheme will run out of network IDs. (Section 3.10 talks about proposals to correct this problem.)
1.3	Obtain a copy of the Host Requirements RFC [Braden 1989a] and look up the robustness principle that applies to every layer of the TCP/IP protocol suite. What is the reference for this principle?
1.4	Obtain a copy of the latest Assigned Numbers RFC. What is the well-known port for the "quote of the day" protocol? Which RFC defines the protocol?
1.5	If you have an account on a host that is connected to a TCP/IP internet, what is its primary IP address? Is the host connected to the worldwide Internet? Is it multihomed ?
1.6	Obtain a copy of RFC 1000 to learn where the term RFC originated.
1.7	Contact the Internet Society, [e-mail] or [phone], to find out about joining.
1.8	Fetch the file about-internic/information-about-the-internic using anonymous FTP from the host is.internic.net .