How to understand the Domain Name System

Written by Clare Lawrence

How to understandrepparttar Domain Name System By Clare Lawrence 13th August 2004

Ever wonder why DNS systems came into existence? Efficiency. Every computer has a distinct IP address, andrepparttar 108267 Internet needed an elite method for obtaining these addresses and for managingrepparttar 108268 system as a whole. Enter ICANN.

The Internet Corporation for Assigned Names and Number managesrepparttar 108269 DNS root ofrepparttar 108270 Internet domain namespace. ICANN’s role is to managerepparttar 108271 assignment of identifiers, ensuring that all users have unique names.

The DNS system is run by a series of servers called DNS servers. ICANN managesrepparttar 108272 root DNS domains, under which arerepparttar 108273 top-level domains. It also manages:

Organizational domains Geographical domains Reverse domains

Beneathrepparttar 108274 top-level domains are other naming authorities such as Nominet,repparttar 108275 UK’s naming authority.

How does a DNS Query work?

The process occurs in two parts. Firstly, a name query begins at a client computer and is passed to DNS client service for resolution. Whenrepparttar 108276 query cannot be resolved locally, DNS servers are queried.

For example, when a web browser callsrepparttar 108277 fully qualified domain name,repparttar 108278 request is passed on torepparttar 108279 DNS client service to resolverepparttar 108280 name by using locally cached information. Ifrepparttar 108281 query is held inrepparttar 108282 cache, thenrepparttar 108283 process is complete.

If, however,repparttar 108284 query cannot be answered locally,repparttar 108285 DNS client service uses a server list (ordered in sequence) to query external DNS servers. When a DNS server receives a query, it first checks to see if it is authoritive for that domain name. If it is authoritive, it resolvesrepparttar 108286 name, andrepparttar 108287 process is complete.

Domain and website tools

Written by Clare Lawrence

Domain and website tools By Clare Lawrence 29th October 2003 Clare isrepparttar CEO of Discount Domains Ltd a leading UK Domain name registration service.

I use several tools to monitorrepparttar 108266 performance of my own websites, by regularly reviewing their progress I can see what works and what does not.

Ranking tools

Where is my listing? Want a tool that can tell you which page your site appears on by keyword?

Top25web searches domain names by keyword forrepparttar 108267 following search engines:- Google, Alta vista and inktomi, drilling down forrepparttar 108268 first 500 entries on each search engine.

How many of my websites pages are indexed? Do you have a large site? – it can be a pain usingrepparttar 108269 site: command in Google,repparttar 108270 following tells you how many of your pages are indexed in Fast, Google, Alta Vista and MSN creates a pie chart ofrepparttar 108271 % of your pages indexed in each ofrepparttar 108272 engines.

Meta – Tag analysers

Meta tags are much less important than they used to be, thoughrepparttar 108273 Title tag is still very powerful.

The following are my favourites:- - selectrepparttar 108274 website analysis option fromrepparttar 108275 left hand, this is particularly good at telling if you’ve gotrepparttar 108276 right combination of keywords in your tags and which keyword should be where. - this analyses your tags, and gives a narrative opinion – excellent beingrepparttar 108277 best rating.

Traffic statistics

Good traffic statistics are essential for your own site, but how to get information on rivals traffic?, Alexa makes use of its own database of user and converts these to a traffic ranking.

The Alexa site can be found at


Google and other search engines have problems with poor html – so cleaning uprepparttar 108278 glitches in your scrip can be helpful. The following is a good free html validator :-

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