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(DNS servers may act as both a root server and an SOA at the same time a very common practice in private networks) As a root server, the Houston server has a listing for the SOA in the Dallas domain This does not mean it knows the IP address for every system in the Dallas network As a root server, it only knows that if any system asks for an IP address from the Dallas side, it will tell that system the IP address of the Dallas server The requesting system will then ask the Dallas DNS server (DNS1Dallas) for the IP address of the system it needs That s the beauty of DNS root servers they don t know the IP addresses for all of the computers, but they know where to send the requests!
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Figure 10-10 Root server in action
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NOTE In the early days of DNS, you were required to enter manually into your DNS server the host name and IP address of every system on the network While you can still do that if you want, today most DNS servers take advantage of Dynamic DNS (DDNS) DDNS enables systems to register their host names with their DNS server automatically, eliminating the need to enter them manually The hierarchical aspect of DNS has a number of benefits For example, the vast majority of Web servers are called www If DNS used a flat name space, only the first organization that created a server with the name www could use it Because DNS naming appends domain names to the server names, however, the servers wwwtotalsemcom and wwwmicrosoftcom can both exist simultaneously DNS names like wwwmicrosoftcom must fit within a worldwide hierarchical name space, meaning that no two machines should ever have the same FQDN
10: Network Naming
EXAM TIP Just because most Web servers are named www doesn t mean they must be named www! Naming a Web server www is etiquette, not a requirement Figure 10-11 shows the host named accounting with an FQDN of accountingtexas totalsemcom
accountingtexastotalsemcom
Figure 10-11 DNS domain
NOTE Technically, the texastotalsemcom domain shown in Figure 10-11 is a subdomain of totalsemcom Don t be surprised to see the terms domain and subdomain used interchangeably, as it s a common practice These domain names must be registered for Internet use with an organization called the Internet Corporation for Assigned Names and Numbers, or ICANN (wwwicannorg) They are arranged in the familiar second leveltop level domain name format, where the top level is COM, ORG, NET, and so on, and the second level is the name of the individual entity registering the domain name
Name Resolution
You don t have to use DNS to access the Internet, but it sure makes life a lot easier! Programs like Internet Explorer accept names such as wwwmicrosoftcom as a convenience to the end user, but utilize the IP address that corresponds to that name to create a connection If you know the IP address of the system you want to talk to, you don t
CompTIA Network+ All-in-One Exam Guide
need DNS at all Figure 10-12 shows Internet Explorer displaying the same Web page when given the straight IP address as it does when given the DNS name wwwmicrosoft com In theory, if you knew the IP addresses of all the systems you wanted to access, you could turn off DNS completely I guess you could also start a fire using a bow and drill too, but most people wouldn t make a habit of it if there were a more efficient alternative, which in this case, DNS definitely is! I have no trouble keeping hundreds of DNS names in my head, but IP addresses Forget it! Without DNS, I might as well not even try to use the Internet, and I d wager that s true of most people
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