post #3

Domain Name System

From Wikipedia, the free encyclopedia

Jump to: navigation, searcht

The Domain Name System (DNS) is a hierarchical distributed naming system for computers, services, or any resource connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities. Most prominently, it translates domain names meaningful for users to the numerical IP addresses needed for the purpose of locating computer services and devices worldwide. By providing a worldwide, distributed keyword-based redirection service, the Domain Name System is an essential component of the functionality of the Internet.
An often-used analogy to explain the Domain Name System is that it serves as the phone book for the Internet by translating human-friendly computer hostnames into IP addresses. For example, the domain name www.example.com translates to the addresses 192.0.43.10 (IPv4) and 2620:0:2d0:200::10 (IPv6). Unlike a phone book, the DNS can be quickly updated, allowing a service's location on the network to change without affecting the end users, who continue to use the same host name. Users take advantage of this when they recite meaningful Uniform Resource Locators (URLs) and e-mail addresses without having to know how the computer actually locates the services.
The Domain Name System distributes the responsibility of assigning domain names and mapping those names to IP addresses by designating authoritative name servers for each domain. Authoritative name servers are assigned to be responsible for their particular domains, and in turn can assign other authoritative name servers for their sub-domains. This mechanism has made the DNS distributed and fault tolerant and has helped avoid the need for a single central register to be continually consulted and updated. Additionally, the responsibility for maintaining and updating the master record for the domains is spread among many domain name registrars, who compete for the end-user's, domain-owner's, business. Domains can be moved from registrar to registrar at any time.
The Domain Name System also specifies the technical functionality of this database service. It defines the DNS protocol, a detailed specification of the data structures and communication exchanges used in DNS, as part of the Internet Protocol Suite.
The Internet maintains two principal namespaces, the domain name hierarchy^[1] and the Internet Protocol (IP) address spaces.^[2] The Domain Name System maintains the domain name hierarchy and provides translation services between it and the address spaces. Internet name servers and a communication protocol implement the Domain Name System.^[3] A DNS name server is a server that stores the DNS records for a domain name, such as address (A) records, name server (NS) records, and mail exchanger (MX) records (see also list of DNS record types); a DNS name server responds with answers to queries against its database.

Post #2

helloworld.html' file

 
     charset
="utf-8">  

   

To Young To Stop

 
This code is written by my hand. This is great.
    This is my first attempt at developing a web page by hand. I think this might lead to something new.
As time goes on I think I can learn to make about any kind of web page.  I have plans for this so I can make a little money doing this.
What do you think?
    Now that I have learned how to do this I want to learn how to add pictures and links.

 <img src="bilde.jpg"/>
 <img src="build3.jpg"/>

 
1 down and 10000000 to go

Blog post 1

I am in virgin territory. This is my one and only blog as of this moment. I have decided to learn a totally new subject. I want to know about computer programing and how it works. I need to satisfy my need to know . This is a new direction in my learning and it takes me out of my comfort zone of knowledge. My first assignment was to start a blog. Well here it is.  My goal is to follow the path of learning in the p2pu courses.If all goes well I will learn a few things about programing and actually write a program of some kind. Well this is it for now.   Rick