Creating a Domain Model

Creating a Domain Model

Company Alpha will need to create a domain, which will underline the system on which the Internet functions. Each location will have a unique numeric Internet protocol (IP) address that will represent a user-friendly form. The importance of the domain names in regards as far as naming the computers and networking the services to map the network addresses and organize them into a hierarchy of domains, which tis process is called name resolution (Marinković, 2012).

In most cases, DNS names will consists of two or more parts separated by periods just like in the example above. The last (rightmost) part of the name is called the top-level domain (TLD), and the other parts of the name are subdomains (Marinković, 2012).

Using Forwarders

Forwarders in a variety of ways to regulate the flow of DNS traffic on your network that receive queries from clients frequently other DNS servers on the Internet to resolve names, generating a significant amount of traffic on the network’s Internet connection which needs a resolution (VIXIE, 2009).

There are several scenarios forwarders can be useful and redirect Internet traffic. For example, if the branch office is connected to your corporate headquarters using a T-1 leased line, and the branch office’s Internet connection is a much slower shared dial-up modem, you can configure the DNS server at the branch office to use the DNS server at headquarters as a forwarder. The recursive queries generated by the clients at the branch office then travel over the T-1 to the forwarder at the headquarters, which resolves the names in the usual manner and returns the results to the branch office DNS server. The clients at the branch office can then use the resolved names to connect to Internet servers directly, over the dial-up connection. No DNS traffic passes over the branch office’s Internet connection (VIXIE, 2009).

Also there is a way forwarders can limit the number of servers that transmit name resolution queries through the firewall to the Internet. If the business has five DNS servers on the network, all of which provide both internal and Internet name resolution services, which will have five points where the network is vulnerable to attacks from the Internet. By configuring four of the DNS servers to send all their Internet queries to the fifth server, this will create only one point of vulnerability.

Understanding Zone Types

Every zone consists of a zone database, which contains the resource records for the domains in that zone (GERBER, 2010). The DNS server in Windows Server 2003 supports three zone types (see Figure 4), which specify where the server stores the zone database and what kind of information it contains. The three zone types are