In this tutorial we look at the basics of TCP IP addressing. All computer administrators should know the basics of IP addressing at least IP version 4 as Red Hat is just incorporating IP version 6 addressing. This is less important for the subject. If this movie is at all confusing, you're probably far from ready for the Red Hat exams. If this is your situation, study IP addressing in detail. Many Linux texts and even networking texts are available for this purpose. IP Version 4 Addressing uses four different numbers they're separated by dots. Each number is between zero and 255. Format is known as dot or decimal notation. There are private and public IP 4 version for addresses on the Internet. Local networks are generally configured with private IP addresses and they'll have one or two public addresses for Internet access. The difference may not all be that important as I doubt Red Hat will allow Internet access during your exam. While this somewhat of no resimplification. There are three basic IP version 4 address classes, they are classified as A, B and C. And the range of possible IP addresses include the numbers I've shown. There private networks available in each of these classes. The class A private network supports a network of several million IP addresses, the standard class A private network has network address of 10.0.0.0 with a subnet mask as shown. These two numbers are combined together in regular notation to delineate the entire network. It sometimes also expressed in CIDR notation. CIDR stands for Classless inter domain rounding. If you want to broadcast a ping to all the computers on that network you can send it to 10.255.255.255 and the range of IP addresses that can be assigned to actual computers are as shown. The class B private network supports a network of approximately 65,000 computers. Generally its configured on a network address of 172.16.0.0, but you can use network addresses of 172.17.0.0 and so on through 172.31.0.0. Subnet masks, broadcast addresses and the range of IP address for this specific network are as shown. On my home network I have a class C private network with a network address of 192.168.0.0 and on this network I can assign up to 254 different IP addresses. Your system probably has a IP address as shown in the output to the IF config command. As you can see my Ethernet card is shown, its been assign an IP version 4 address of 192.68.0.26 and it's associated with a broadcast address and a subnet mask for that network. I've even been assign an IP version 6 address. Thank you and on to the next tutorial.