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I agree with @leew about really-really hosting a live zone (domain) by yourself. For internal use (for example, Active Directory) it's more than recommended to manage your own DNS but for public DNS, there are so many aspects to take care of from security to redundancy that you better let Service Providers do the job. For example, you must have at least two name servers and they must not fail to serve your your zone no matter what the query load is. 
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I agree with @leew about really-really hosting a live zone (domain) by yourself. For internal use (for example, Active Directory) it's more than recommended to manage your own DNS but for public DNS, there are so many aspects to take care of from security to redundancy that you better let Service Providers do the job. For example, you must have at least two name servers and they must not fail to serve your your zone no matter what the query load is.

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I understand the concept of DNS but when somebody says that he/she does his/her own DNS, does it mean that they have their own DNS server? If yes is there any tutorial on how to implement it because I'd like to know more about it? Thx
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I understand the concept of DNS but when somebody says that he/she does his/her own DNS, does it mean that they have their own DNS server? If yes is there any tutorial on how to implement it because I'd like to know more about it? Thx

Do-it-yourself DNS

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

Network design and methodology, also known as network architecture, is the design of a communication network. It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as data formats used in its operation. In telecommunication, the specification of a network architecture may also include a detailed description of products and services delivered via a communications network, as well as detailed rate and billing structures under which services are compensated.

Network Architecture

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.