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These days, most laptop or computer users are pretty familiar with navigating to DNS-based resources, such as www.microsoft.com . To resolve these friendly names to TCP/IP addresses that the network stack can use, you have to have some process for mapping them. Originally, ASCII flat files (sometimes named HOSTS files, as shown in Figure three.1) had been made use of for this purpose.

In some cases, HOSTS files are nonetheless utilized at present in rather little networks, simply because they are able to assistance troubleshoot name resolution problems.

As the quantity of machines and network devices grew, it became unwieldy for administrators to manage all of the manual updates expected to enter new mappings to a master HOSTS file and distribute it. Also, years ago countless Microsoft networks applied WINS servers, which helped turn a NetBIOS (pc) name into a TCP/IP address. Just like with a HOSTS mcsa certification
file, somebody had to manually configure the ASCII flat-file version of WINS, referred to as the LMHOSTS file. These files did enable networks lessen ...
... broadcast targeted traffic, but clearly, a superior program was necessary. As you'll be able to see from the sample HOSTS file in Figure 3.1, you can conduct a speedy test from the e mail servers name resolution:

Make an effort to ping the server utilizing the host name to verify that you simply can reach it applying an easy-to-remember name.

Following these actions need to drive property the concept of DNS for you personally given that you possibly can see it operating to make your life simpler. Now you dont need to bear in mind 10.0.0.10, as an example; you must keep in mind exchange03 only.

You are able to almost certainly also see how this strategy can come to be unwieldy when you have a great number of hosts that choose to use easy-to-remember names as an alternative to IP addresses to find resources on your network.

When dealing with large networks, each users and network administrators should be in a position to locate the resources they need with minimal looking. Users dont care about the actual physical or logical network address with the machine; they just desire comptia security certification
to be able to connect to it applying a hassle-free name that they're able to remember. From a network administrators standpoint, having said that, every single machine should have its personal logical address that makes it a part of the network on which it resides. Therefore, some scalable and easy-to-manage system for resolving a machines logical name to an IP address was necessary. DNS was designed for this purpose.