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What happens when we type in a URL.Hi All,
What happens when we type a URL in the url box. FOr ex, when we type say www.hotmail.com, I believe the request will go to some central server,where it knows that hotmail.com is mapped to so and so ipaddress and then the files are obtained from that ipaddress. The questions where is the central database/locations. Can some throw any ideas on this. Thanks. "test" <laksh***@comcast.net> wrote in message It's called DNS, Domain Name System, and there is a lot of information on it news:v8idnfccmb7MG9XanZ2dnUVZ_j-dnZ2d@comcast.com... > Hi All, > > What happens when we type a URL in the url box. FOr ex, when we type say > www.hotmail.com, I believe the request will go to some central server, > where it knows that hotmail.com is mapped to so and so ipaddress and then > the files are obtained from that ipaddress. > > The questions where is the central database/locations. Can some throw any > ideas on this. > > Thanks. via Google. Exactly which DNS server you use at a particular moment depends on your ISP at the moment. HTH -pk On Sat, 24 Nov 2007 12:15:13 -0800, "test" <laksh***@comcast.net> That's correct. It's called a DNS (Domain Name System) Server.wrote: > Hi All, > > What happens when we type a URL in the url box. FOr ex, when we type say > www.hotmail.com, I believe the request will go to some central server, > where Also correct. The "real" address of the web site is that IP address,> it knows that hotmail.com is mapped to so and so ipaddress and then the > files are obtained from that ipaddress. not the URL. > The questions where is the central database/locations. Can some throw any Usually the DNS Server is one automatically provided by your ISP, but> ideas on this. you can specify a different one in the Network Connections dialog. Seldom is it necessary to use any but the one your ISP Provides. -- Ken Blake, Microsoft MVP Windows - Shell/User Please Reply to the Newsgroup So does that mean that every ISP will have a DNS server,and where is this
running. That is the whole piont I am not understanding. I thought there should only be one DNS server running at a central location which maps names to ip addresses(and all the requests regarding which ISP's they are from should go to that server). Regardless there should be only central database which maps domain names to ip addresses. Please share your thoughts. Thnx. Show quote "Ken Blake, MVP" <kbl***@this.is.am.invalid.domain> wrote in message news:pg3hk353qi8gahgjmg6v9cre6jqshq8uq4@4ax.com... > On Sat, 24 Nov 2007 12:15:13 -0800, "test" <laksh***@comcast.net> > wrote: > >> Hi All, >> >> What happens when we type a URL in the url box. FOr ex, when we type say >> www.hotmail.com, I believe the request will go to some central server, > > > That's correct. It's called a DNS (Domain Name System) Server. > > >> where >> it knows that hotmail.com is mapped to so and so ipaddress and then the >> files are obtained from that ipaddress. > > > > Also correct. The "real" address of the web site is that IP address, > not the URL. > > > >> The questions where is the central database/locations. Can some throw any >> ideas on this. > > > Usually the DNS Server is one automatically provided by your ISP, but > you can specify a different one in the Network Connections dialog. > Seldom is it necessary to use any but the one your ISP Provides. > > -- > Ken Blake, Microsoft MVP Windows - Shell/User > Please Reply to the Newsgroup On Sat, 24 Nov 2007 14:16:49 -0800, "test" <laksh***@comcast.net> "Every" is a very strong word that I'm always reluctant to use. Iwrote: > So does that mean that every ISP will have a DNS server, wouldn't be surprised if some don't and share another ISP's server. Still the answer to your question is generally yes. > and where is this At the ISP's site.> running. > That is the whole piont I am not understanding. No, there are many. I assume that they somehow communicate with each> > I thought there should only be one DNS server running at a central location other, so that they all contain essentially the same information, but I don't know the specifics of how that is done. Show quote > which maps names to ip addresses(and all the requests regarding which ISP's > they are from should go to that server). Regardless there should be only > central database which maps domain names to ip addresses. Please share your > thoughts. > > Thnx. > > "Ken Blake, MVP" <kbl***@this.is.am.invalid.domain> wrote in message > news:pg3hk353qi8gahgjmg6v9cre6jqshq8uq4@4ax.com... > > On Sat, 24 Nov 2007 12:15:13 -0800, "test" <laksh***@comcast.net> > > wrote: > > > >> Hi All, > >> > >> What happens when we type a URL in the url box. FOr ex, when we type say > >> www.hotmail.com, I believe the request will go to some central server, > > > > > > That's correct. It's called a DNS (Domain Name System) Server. > > > > > >> where > >> it knows that hotmail.com is mapped to so and so ipaddress and then the > >> files are obtained from that ipaddress. > > > > > > > > Also correct. The "real" address of the web site is that IP address, > > not the URL. > > > > > > > >> The questions where is the central database/locations. Can some throw any > >> ideas on this. > > > > > > Usually the DNS Server is one automatically provided by your ISP, but > > you can specify a different one in the Network Connections dialog. > > Seldom is it necessary to use any but the one your ISP Provides. > > > > -- > > Ken Blake, Microsoft MVP Windows - Shell/User > > Please Reply to the Newsgroup > -- Ken Blake, Microsoft MVP Windows - Shell/User Please Reply to the Newsgroup Ken Blake, MVP wrote:
> "Every" is a very strong word that I'm always reluctant to use. I That's not quite how I understand it. In general, there's a DNS (Domain > wouldn't be surprised if some don't and share another ISP's server. > Still the answer to your question is generally yes. Name Server) that tells you which DNS handles ".com" and which one handles ".net" and so on. So to lookup www.swiftys.org.uk you start with the ".uk" piece, then go to the DNS for the '.org.uk' piece and so on. Eventually you ask the DNS for "swiftys.org.uk" what the IP address of "www.swiftys.org.uk" is, and you have the IP address of my webserver. (Or rather the IP address of my friends Linux server, which hosts my website in his garage). There are shortcuts built into the mechanism, and it's a *lot* more complex than I've indicated. My ISP is BT, and they have a DNS for their own IP addresses, which I use, but when resolving "www.swiftys.org.uk" it gets it from somewhere completely different, and even though I'm paying someone for this service, I don't really have much idea how it works.
Show quote
"Swifty" <Steve.J.Sw***@gmail.com> wrote in message DNS is basically hierarchal. What happens is this. Say when you type in news:#MbfQ6yLIHA.3976@TK2MSFTNGP03.phx.gbl... > Ken Blake, MVP wrote: >> "Every" is a very strong word that I'm always reluctant to use. I >> wouldn't be surprised if some don't and share another ISP's server. >> Still the answer to your question is generally yes. > > That's not quite how I understand it. In general, there's a DNS (Domain > Name Server) that tells you which DNS handles ".com" and which one handles > ".net" and so on. > So to lookup www.swiftys.org.uk you start with the ".uk" piece, then go to > the DNS for the '.org.uk' piece and so on. Eventually you ask the DNS for > "swiftys.org.uk" what the IP address of "www.swiftys.org.uk" is, and you > have the IP address of my webserver. (Or rather the IP address of my > friends Linux server, which hosts my website in his garage). > > There are shortcuts built into the mechanism, and it's a *lot* more > complex than I've indicated. > > My ISP is BT, and they have a DNS for their own IP addresses, which I use, > but when resolving "www.swiftys.org.uk" it gets it from somewhere > completely different, and even though I'm paying someone for this service, > I don't really have much idea how it works. www.microsoft.com. It will first check your hosts and lmhosts files on the local machine. If it does not find it there, it next checks the dns servers indicated when you get your ip address from your ISP through DHCP, or whatever you entered if you have a static IP. Simplistically put, it will keep kicking the the request up the line until it gets to the root servers if needed until the address of the site requested is found. I could get into a more technical explanation as to how the root servers pass off to authoritative servers at the top level domains( .com, .edu, ..org, etc.), why caching is important in relation to speed, ad nauseam. But this just gives you the basics of how things work. -- Ya know...the hurrier I go, the behinder I get. Remember to always engage brain, before putting mouth into gear. Kill the munge to reply by email. Hello,
See http://computer.howstuffworks.com/web-server.htm/printable -- Show quoteSingapore Web Design http://www.bootstrike.com/Webdesign/ Singapore Web Hosting http://www.bootstrike.com/WinXP/faq.html Windows XP FAQ "test" <laksh***@comcast.net> wrote in message news:v8idnfccmb7MG9XanZ2dnUVZ_j-dnZ2d@comcast.com... > Hi All, > > What happens when we type a URL in the url box. FOr ex, when we type say > www.hotmail.com, I believe the request will go to some central > server,where it knows that hotmail.com is mapped to so and so ipaddress > and then the files are obtained from that ipaddress. > > The questions where is the central database/locations. Can some throw any > ideas on this. > > Thanks. > >  |
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