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Any network address must provide two pieces of information: it must uniquely identify the machine and it must locate that machine within the larger network In a TCP/IP network, the IP address identifies the PC and the network on which it resides IP Addresses In a TCP/IP network, the systems don t have names but rather use IP addresses The IP address is the unique identification number for your system on the network Part of the address identifies the network, and part identifies the local computer (host) address on the network IP addresses consist of four sets of eight binary numbers (octets), each set separated by a period This is called dotted-decimal notation So, instead of a computer being called SERVER1, it gets an address like so:
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Written in binary form, the address would look like this:
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But the TCP/IP folks decided to write the decimal equivalents:
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00000000 00000001 00000010 11111111 = 0 = 1 = 2 = 255
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Pinging the loopback is the best way to test if a NIC is working properly To test a NIC s loopback, the other end of the cable must be in a working switch or you must use a loopback device
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IP addresses are divided into class licenses, which correspond with the potential size of the network: Class A, Class B, and Class C Class A licenses were intended for huge companies and organizations, such as major multinational corporations, universities, and governmental agencies Class B licenses were assigned to medium-size companies, and Class C licenses were designated for smaller LANs Class A networks use the first octet to identify the network address and the remaining three octets to identify the host Class B networks use the first two octets to identify the network address and the remaining two octets to identify the host Class C networks use the first three octets to identify the network address and the last octet to identify the host Table 182 lists range (class) assignments You ll note that the IP address ranges listed above skip from 126xxx to 128xxx That s because the 127 address range (ie, 127001 127255 255255) is reserved for network testing (loopback) operations (We usually just use the address 127001 for loopback purposes, and call it the localhost address, but any address that starts off with 127 will work just as well) That s not the only reserved range, either! Each network class has a specific IP address range reserved for private networks traffic from these networks doesn t get routed to the Internet at large Class A s private range goes from 10001 to 10255255254 Class B s private range is 1721601 up to 17216255254 Class C has two private addresses ranges: 19216800 to 192168255254 for manually configured addresses, and 16925401 to 169254255254 to accommodate the Automatic Private IP Addressing (APIPA) function Subnet Mask The subnet mask is a value that distinguishes which part of the IP address is the network address and which part of the address is the host address The subnet mask blocks out (or masks ) the network portions (octets) of an IP address Certain subnet masks are applied by default The default subnet mask for Class A addresses is 255000; for Class B, it s 25525500; and for Class C, 2552552550 For example, in the Class B IP address 1311904121 with a subnet mask of 25525500, the first two octets (131190) make up the network address, and the last two (4121) make up the host address
The CompTIA A+ certification exams do not require you to break down IP addresses and subnet masks into their binary equivalents or to deal with non-standard subnet masks like 2552552400, but you should know what IP addresses and subnet masks are and how to configure your PC to connect to a TCP/IP network
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