|
Home > Archive > CCNA > January 2002 > Couple of ISP questions
You are viewing an archived Text-only version of the thread.
To view this thread in it's original format and/or if you want to reply to
this thread please [click here]
| Author |
Couple of ISP questions
|
|
| UKCCNA 2002-01-27, 2:49 pm |
| Hi all, I know strictly speaking these questions are out of the scope for the CCNA exam but they bug me so...
When you connect to a web server over the internet, do you literally connect to a port on the remote server (via intermediate switches/routers/web servers) OR does your ISP act like a LAN proxy server and retrieve the pages for you and then forward them onto you(therefore "physically" you are only ever connected to the ISP).
ALSO...
When I use NeoTrace to trace a route from my default location (Milton Keynes) to my ISPs POP (a switch somewhere in Milton Keynes) the route seems to go from Milton Keynes down to London (about 50miles south) and then back upto the switch in Milton Keynes...is this right? seems a bit inefficient?
Maybe miles off here folks!
Have a Good One!
 | |
|
|
| UKCCNA 2002-01-28, 6:51 am |
| Woops sorry I meant to say that the above scenario was using a Dial-up Internet connection (TCP/IP / PPP)...
Thanks anyway there was some useful info "in dem der links!" | |
| Hippo 2002-01-29, 10:07 am |
| 
Hiya
I have both worked for and supported ISPs. It is most likely that the ISP uses a web cache server, BT Openworld certainly do. It makes sense to do so because as an end user, you want to receive the web pages as fast as possible. Can you imagine downloading multiple pages from a transatlantic web site. The web cache servers store pages for a limited period of time and make frequent checks of the page's vailidty and how up to date it is. ISPs make use of 'server farms' sometimes remotely located from their router and switch environment. This would explain why your trace route takes to London - to collect an already cacged page - and then back to MK to route it back to you.
Cheers
Hippo  (Glad to see MK represented on the forum) |
|
|
|
|