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Synchronizing time with other servers in an NTP hierarchy uses the concept of stratum Every server in the NTP hierarchy has a stratum setting between 1 and 15, but with a stratum of 16 being used to signify that a clock is not currently synchronized at all The highest stratum level that a clock can use is 1 Typically, this is a server that s connected directly to an atomic clock with a very high accuracy The stratum level that is assigned to a server that s directly connected to an external clock depends on the type of clock that s used In general, though, the more reliable the clock is, the higher the stratum level will be A server can get its time in two different ways: by synchronizing with another NTP time server or by using a reference clock.

Once you have an understanding of the tables in the database and how they are related, you can look at which tables you will need in order to extract the subset of data you require. Consider a query like Find all the men who have entered a Leeston tournament. This sentence contains a few key words. Nouns are often a clue to which tables or fields we are going to need. Verbs often help us find relationships. Let s look at the nouns. Tournament is a big clue, and we have a Tournament table, so that is a start. The word men is another noun in the query description. We don t have a Men table, but we do have a Member table. It is fairly clear then that the Member and Tournament tables are going to play a part in our query. Now we need to get a feel for how these two tables are related. Figure 10-4 shows the part of the SQL Server database diagram containing these two tables. We see that that they are not directly related but are connected via the Entry table. That makes sense, because the verb enter is in our query description.

Content: You can disable pop-up windows and disable JavaScript. Note that it s quite unlikely that you would want to completely disable JavaScript, because many modern web sites make heavy use of it (including online shopping sites and web-based e-mail, such as Google s Gmail). You could use a third-party plug-in called NoScript (http://noscript.net). This tool allows you to disable JavaScript, Java, Flash, and other plug-ins that could potentially be harmful to Firefox on all web sites by default. You can easily re-enable these scripts on each web site that you trust through the NoScript applet, located in the lower-right corner of the browser window. Privacy: You can customize retention of browser history, cookies, and private data. If privacy is of utmost importance, you can select the option Use custom settings for history and check the Clear history when Firefox closes check box. Security: You can customize attack site and forgery detection, passwords, and warning messages. You should customize these settings based on how you use the Web. For example, it s obvious that the Warn me when sites try to install add-ons check box should be selected, since malware is distributed this way. And if you transact business on the Web, the Block reported web forgeries option offers added protection from getting duped.

Summary

If a server synchronizes with an NTP time server, the stratum used on that server will be determined by the server it s synchronizing with: if a server synchronizes with a stratum 3 time server, it automatically becomes a stratum 4 time server If, on the other hand, a reference clock is used, a server does not get its time from a server on the Internet but instead determines its own time Again, the default stratum used is determined by the type and brand of reference clock that s used If it s a very reliable clock, such as one synchronized via GPS, the default stratum setting will be high If a less reliable clock (such as the local clock in a computer) is used, the default stratum will be lower.

In this chapter, you ve looked at what threats your system faces and how security holes can be exploited by malicious interests. You learned about measures you can take to protect your system, such as updating it online, using AppArmor to guard against errant applications, configuring the system s firewall, using encryption for e-mail and file privacy and authentication, installing an antivirus program, and customizing web browser security. We also discussed some commonsense rules you can follow to keep your system safe. In the next chapter, we move on to looking at how your Ubuntu system can be personalized and how to set up everything to suit your own preferences.

What does SQL do If we say SELECT MemberType FROM Member, we will get the output in Figure 2-8a with all the duplicates included. If we do not want the duplicates, then we can use the keyword DISTINCT, as in Listing 2-21.