• 07Apr

    Active Directory is truly the heart of an organization. You might even say if a computer system were a human being it would be the brain spanning all knowledge of the system. It is a central repository for all data regarding users, groups, computers, printers, shared folders, contacts, and policies. This store all information into a database, also can be known as the hive. Which contains strings and strings of data, and meta data.

    Many applications are written to connect to the Active Directory. This is useful because when you start to implement a system you can easily integrate it with authentication. If you are a authenticated user at a certain level you can restrict other users access to other resources. Such as you don’t want your Public Relations department to be able to have access to Human Resources files.

    As a Systems Administrator or Network Administrator you can safeguard practically anything you chose. You can even specify in a group policy what programs you would want users to access or install. Let alone when a user signs on run a batch file or implement an import of internal resources of favorites into the users Internet Explorer. If you are just learning about Information Technology I would suggest you visit Microsoft’s website for a training guide. There you can also find resources such as a Virtual Machine to experiment with. You need to practice because this is something you will need to know.

    – Harry Caskey

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  • 06Apr

    I started thinking about this last night. I know the significance of DNS within my field and I thought I would blog about it today. DNS is such a power tool, the average user uses it all the time and probably doesn’t know it.

    DNS plays a huge role in connection everyone to everyone. It starts with your Local Network Connection, for any network connection to work you have to have at least these 3 different settings configured. 1) An IP Address, this is your unique identifier assigned to a media access control (MAC) address which is the hardware that is your device. 2) A Gateway, this needs to be defined so that when you request data it knows where to send it out and expect to receive. 3) DNS Servers, after you have your IP address assigned and Gateway you will need your DNS servers to do resolution requests for you such as….

    Let’s say you get your network card setup and want to go to “www.google.com” well your computer doesn’t automatically know where “www.google.com” is at. So it sends a request to a DNS server which holds that information. So you are at your computer you type the address in “www.google.com” the first query that gets asked is where is “.com.” at? The .com is part of what’s called a TLD which stands for Top Level Domain. These are typically government run servers by ICANN. At this level these domain names can not be purchased. Then your query request then looks for the record “google” under the TLD “.com.”. When it finds that record it asks for “www” under “.google.com.”? Then for each of these requests you have a Public IP address, these are assigned by your Internet service provider (ISP). So the final query that gets sent to your computer returns the value IP address with (209.85.139.9) resulting in “www.google.com.”. Your computer then receives all of the information that is provided on the default port 80 at that IP address with that given host header value.

    It is vital as a Network Administrator to know that your network is configured correctly. This also is very important to know because when you need to troubleshoot something you will need to know how to solve the problem. If you If you are just learning about the Information Technology field or have an interest, it is very important that you know how DNS works and if there is an underlying issues within your zone records. So that when clients request access to certain sites you know where they are being sent to.

    One great thing about DNS that you can utilize is custom domain configuration you can make a domain name “blahdityda.blog” and tell your DNS server to point to this web server. When you control the DNS you can configure your local DNS to allow “blog” to be a TLD then under that record configure bladityda to point to the specific web server hosting the host header value. These are great for and commonly used in organizations that have internal portals, or intranets.

    If you learn DNS like that back of your hand it will make things easier for you and how you can manage your network. I would recommend that you utilize DNS to it’s full potential.

    – Harry Caskey

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