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The most important advantage offered by DNS is the fact that it s organized in a hierarchical manner. This makes the system very scalable because it can be extended by simply adding another branch to the tree-like hierarchy. On top of the hierarchy are the root servers, which have one purpose only: provide information about the top-level domains (TLDs). Some fixed domain names are used for top-level domains, including .com, .org, and .info. Top-level domains exist for all countries as well, such as .nl, .uk, .fr, and so on. Within these top-level domains, persons and organizations can create their own domains, which may contain subdomains as well. For example, an organization could create a domain called example.com and, within the structure of example.com, it could create some subdomains as well, such as east.example.com and west.example.com.

One argument is that Windows is the target of so many viruses merely because it s so popular Although it s true that some of those who write viruses do so because they dislike Microsoft, there s also little doubt that Windows has more than its fair share of security issues Many people are still critical of Microsoft s approach to security For example, from Vista onwards, Windows includes User Account Control (UAC) dialog boxes that appear whenever a system-affecting action is required However, they are so common that many people stop reading what they warn about and simply click OK by reflex Many even switch them off Compare that to Ubuntu: Similar dialog boxes appear whenever a system-affecting action is required, but the Ubuntu password dialog boxes have more of an impact because they appear far less frequently than UAC dialog boxes.

Very few queries involve just a single table, and one of the most common operations in a query is the join. Making joins efficient is certainly worthwhile. Joins involve comparing the values of fields in each of the tables involved in the join. While a join can be on any field, a very common situation is joining the foreign key in one table to the primary key in the table it is referencing. Figure 9-4 shows the Entry table and some columns from the Member table. In the Entry table, MemberID is a foreign key referring to the Member table, which means that any value in MemberID in the Entry table must already exist in the Member table. The data was split into these two separate tables to avoid the updating problems discussed in 1. However, many queries involving the Entry table will also require information from the Member table (for example, a member s name), so we need to join the tables as shown in Listing 9-4. A similar join between the Entry and Tournament tables is also likely to be carried out often.

Also, here the user s password must be entered This forces the user to stop and think rather than simply click a mouse button Although Windows 7 offers reasonable security, Windows XP, Microsoft s most popular operating system (OS) to date, is considered an easy target for hackers and virus writers Upon installation, the default user is given administrative privileges True, a handful of tasks can be performed only by the genuine administrator, but the default user can configure hardware, remove system software, and even wipe every file from the hard disk Although you would never intentionally damage your own system, computer attackers use various techniques to get you to run malicious software (by pretending it s a different file, for example) or they simply infect your computer across the Internet without your knowledge, which is how most worms work.

The number of subdomains is virtually unlimited, although it becomes hard to work with more than four or five levels of domains. No one wants to type www.servers.east.nl. sandervanvugt.com all the time, do they Figure 9-1 provides an example of the partial DNS hierarchy.