The IETF published a Recommended Best Practice (RFC 1918) that defined several “private” IP networks that could be used by individuals, corporations, or other organizations without needing to pay to lease them from an Internet service provider (ISP). Public and Private IP AddressesĪs the popularity of TCP/IP increased, many organizations wanted to use it in their own networks, without paying to be connected to the Internet. This is critical to answering subnetting questions. You absolutely must be able to identify the class of an address just by looking at what number is in the first octet. This is because at some point the address 127.0.0.1 was reserved for the loopback (sometimes called localhost) IP-this is the IP of the TCP/IP protocol itself on every host machine. The result is that certain ranges of networks are grouped into classes in a pattern based on the binary values of those high-order bits, as detailed in Table 3.7. These classes were identified based on the pattern of high-order bits (the high-value bits at the beginning of the first octet). Address ClassĮarly in the development of IP, RFC 791 designated five classes of IP address: A, B, C, D, and E. The following sections detail how IP addresses are organized and analyzed, with a view to answering subnetting questions. The default mask is /16 /24 is longer so the address is subnetted.ĬCNA candidates need to be fluent in their understanding of IP addressing concepts. What is the range of private Class A addresses?. What is the range (in decimal) of Class B addresses?.What class of IP address is 191.168.1.0?.
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