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Although DNS is the main system used for name resolution, it s not the only one. You can set it up in parallel with a NIS system and the /etc/hosts file. If you do this, the order in which the different systems are searched is important. The search order is determined by the /etc/nsswitch.conf file; see Listing 9-2 for an example. Listing 9-2. Contents of the /etc/nsswitch.conf File root@RNA:~# cat /etc/nsswitch.conf # /etc/nsswitch.conf # # Example configuration of GNU Name Service Switch functionality. # If you have the `glibc-doc-reference` and `info` packages installed, try: # `info libc "Name Service Switch"` for information about this file. passwd: group: shadow: hosts: networks: protocols: services: ethers: rpc: netgroup: compat compat compat files dns files db db db db nis files files files files

The hard way requires in-depth knowledge of how networks operate and an ability to hack configuration files, both of which are beyond the skills of many ordinary computer users Fortunately, several programs act as interfaces to iptables and make it simple to operate (or at least as simple as any equivalent Windowsbased software firewall, such as ZoneAlarm from Check Point Software Technologies) In Ubuntu, this built-in firewall is turned off by default This is because the developers don t think that Ubuntu requires a firewall, and on a technical level, they re correct Unlike Windows, Ubuntu has no Internet-facing services (programs that wait for connections from the Internet or local area network) It was just such a service on Windows XP that allowed the Blaster worm to bring the Internet to its knees in 2003 (see http://enwikipediaorg/wiki/Blaster_worm).

Expressed metaphorically, the theory is that without any windows or doors, Ubuntu is difficult, if not impossible, for hackers to break into (or for viruses or worms to infect) However, configuring the firewall with a program like Firestarter, which we examine later in this chapter, can be done so quickly and with such little effort that, in our opinion, there s no reason not to use the Linux firewall In addition, as with most versions of Linux, Ubuntu doesn t come with antivirus protection out of the box This is because there are practically no viruses affecting Linux, and it is reasoned that there simply isn t a need for virus protection However, as with a firewall configuration program, installing an antivirus program is easily done, and we explain how in this chapter But first, we spend some time examining more-basic security concepts.

For all of the important information on your server, the nsswitch.conf file contains an indication where it should be searched for. In the case of hosts and network information, the example file is pretty clear: it first checks local configuration files and only after that does it check the DNS hierarchy. This means that you can use /etc/hosts to override information as defined in DNS.

If the Member table did not have an index on the names, this would require the rows to be retrieved and then sorted. Will it help to provide an index on LastName (or better still, a compound index on LastName, FirstName) Not necessarily. If the name index is a clustered index, it will definitely help speed up the process, because all the information we are seeking is contained in the required order in the index. If it is a nonclustered index, we can find the names in the correct order, but then we need to follow the reference to the whole row to look up the rest of the information. The lookup operation can be quite costly, and often the database system will choose to scan the unsorted table and then sort the records later. How does the database software know what to do and, more important, how do we know what it is going to do We will come back to these questions in the Query Optimizer section later in this chapter.

Following that, we look at how to set up encryption for files and e-mail so they can be opened only by the intended recipients Then we cover some elementary steps that you can take to protect your system..

If you ve switched to Ubuntu from Windows, there s a very good chance that the security failings of Windows featured in your decision. Windows 7 contains many improvements, but Microsoft s record on security over the past few years has not been great. New and serious security warnings have appeared on an ongoing basis, and even now, new and devastating viruses and Trojans make news headlines with worrying frequency (usually described as a PC virus rather than what it actually is a Windows virus).