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In the age of computers and scientific calculators, making manual conversions between binary and decimal notation might seem like an outmoded and unnec essarily tedious means of solving an arithmetic problem. Truth be told, network administrators on the job rarely need to make such conversions, and when they do, administrators are far more likely to rush to a calculator for help than to a pencil and paper. Even during the certification exam, you can avoid performing manual conversions because at many test centers a scientific calculator is built into the exam interface. (All test centers include at least a non-scientific calculator.) So, you might ask, why not simply rely on calculators to perform decimal binary conversions and avoid performing these operations by hand The short answer is that by learning to perform these calculations by hand, you will visualize IP addresses more clearly and therefore be able to spot and repair IP configuration problems more easily. This skill is especially important for subnetted networks, in which IP address schemes can appear confusing. Regardless of this practical benefit, performing manual conversions between the dotted-decimal and binary notation of an IP address is simply a skill expected of a good network administrator, the same way a modern accountant who relies on accounting software for everyday calculations is still expected to be able to perform long division. If that analogy doesn t provide ample motivation, just think that learning to perform these operations by hand gives you a backup method of performing conversions when a scientific calculator is unavailable, as well as an always-available means to flaunt esoteric knowledge and impress your coworkers.

Accustomed to decimal systems, people naturally prefer to express decimal values over their binary equivalents. With dotted-decimal notation, each 32-bit address value of an IP address is viewed as four base-10 groupings ranging from 0 to 255, as in the exam ple 192.168.0.225. These values represent the four 8-bit values that make up the 32bit address. In both binary and decimal notations, each of the four groupings is referred to as an octet. However, only in binary form is it possible to see the value of each individual bit. For example, the IP address 192.168.0.225 is expressed in binary notation in the following manner:

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When a user attempts to log on to a Windows Server 2003 network, DNS is required to locate a domain controller and any other network resources the client needs to access. In fact, when you install Windows Server 2003 on the first server in your organization and add the Domain Controller role, you can choose to have the wizard install the DNS Server role and add new zones based on the DNS name you specified in the wizard. In many organizations, a BIND version of DNS is already running. This BIND version, unfortunately, might not support the DNS requirements for deployment of Active Directory. You can correct these problems by doing the following:

11000000 10101000 00000000 11100001

For any 32-bit IP address, octets and bit places are numbered from left to right. Conse quently, the first octet refers to the leftmost octet, and bit places 1 through 8 refer to the eight leftmost bit places, beginning on the far left. The second octet refers to the next eight bits (bit places 9 16), followed by the third octet (bit places 17 24), and the

Upgrade all BIND DNS servers to version 8.1.2 or later to meet DNS requirements for Active Directory support. Verify that the BIND DNS implementation you are using supports the service loca tion (SRV) resource record. Remember that the SRV record specifies the location of services. For example, _http._tcp.contoso.com IN SRV 0 0 80 could be an SRV record that pointed all users to a Web server named webserver.contoso.com. Verify that the BIND DNS implementation you are using supports dynamic updates, as described in Request For Comments (RFC) 2136. This is not a requirement, but it is highly recommended. If this feature is not supported, additional manual administration of SRV records will be needed for DNS configuration support of Active Directory to work properly.

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fourth octet (bit places 25 32). Periods are used to separate the four octets in dotteddecimal notation, and spaces are used to separate them in binary notation. Table 2-2 shows the scientific and decimal notations associated with each bit place within a binary octet. Notice that as you move from left to right and begin with the first bit s value of 128, each successive bit represents half the potential value of the previous bit. In reverse direction, as you move from right to left and begin with the eighth bit s value of 1, each successive bit represents double the potential value of the previous bit. This pattern allows you to easily recall the potential value of each bit place within an octet.

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Table 2-2

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