INT21CN Computer Networks

Practical #11

  1. Discover the IP address of the computer you're using to read this Prac sheet. How you do this depends on what operating system you're running.

    What is the (apparent) class of the IP address that you discover? What is the netmask in use? Are there any other IP addresses mentioned that are interesting? And anyway, why did I use the word "apparent" above?

  2. Optional Exercise: write [1] a computer program that can translate between 32-bit numbers and dotted decimal form. Extend your program to determine whether the address is class A, B or C, and print the network and host portions. Further extend your program to recognise and identify special IP addresses such as the limited broadcast address, a directed broadcast address, etc.
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