Question: Trying to Set an Invalid IP Address Time Required: 10 minutes Objective: Try to set an invalid IP address in Windows. Required Tools and Equipment: Net-XX Description: In this project, you use the Network Connection Properties dialog box to try to set an invalid IP address-subnet mask combination.
1. Log on Net-XX as NetAdmin, if necessary. Right-click Start and click Network Connections.
2. Right-click Ethernet0 and click Properties. Double-click Internet Protocol Version 4 (TCP/IPv4).
3. Make a note of your current IP address settings. In the IP address text box, type 192.168.100.0, and in the Subnet mask text box, type 255.255.255.0. Click OK. You see a message stating that the IP address and subnet mask combination is invalid because all the host bits are set to 0. Click OK.
4. In the IP address text box, type 192.168.100.16, and in the Subnet mask text box, type 255.255.255.240. Click OK. Again, you see a message stating that the IP address and subnet mask combination is invalid because all the host bits are set to 0. The 255.255.255.240 subnet mask specifies that there are 28 bits in the network ID and only 4 host bits. If you do a binary conversion on the last octet (16), you see that the last 4 bits are 0. Click OK.
5. In the IP address text box, type 192.168.100.255, and in the Subnet mask text box, type 255.255.255.0. Click OK. Now you see a message stating that the IP address and subnet mask combination is invalid because all the host bits are set to 1. Click OK.
6. In the IP address text box, type 192.168.100.63, and in the Subnet mask text box, type 255.255.255.224. Click OK. Again, you see a message stating that the IP address and subnet mask combination is invalid because all the host bits are set to 1. If you convert 63 to binary, you find that it's 00111111. Because the network ID is 27 bits, all 5 bits of the host ID are set to binary 1. Click OK.
7. Change the IP address back to the original settings, and click OK twice. Close all open windows. Stay logged on to your computer if you're continuing to the next project.