lesson 1: WWW, internet, info privacy Flashcards
what is the internet
interconnected networks-not the same as www
when a comp is turned off, do application systems have the ability to store info. What can?
no bc they are terminated
it is the storage device that can store info (hard disk). this is why we save our files.
what does web server down mean
means a software application/system is not working
most used web servers
apache. http, litespeed, openresty
what is www
one of the many services the internet provides. provides acess to internet info/resources such as videos
what is http protocol
a request response stateless protocol that doesnt remeber user info. there will be no response if there is no request
url
uniform resource locator
what are 1998 cookies
a text file max 4k bytes
what server is the internet based on
client server architecture which has no built in security measures
which layers does the web server deal w
application
presentation
session
(do not provide security)
why is www based on n-tier architetecure
bc secruity reasons that affect the web server not j the web user
tier 1-presentation tier
-consists of web browser and http part of the web browser
-responsible for collecting the request from the user and fowarding the request to the web server
tier 2 application tier
contains server-side scrips which are exectued to process data and send the info to tier 1
aso handles identity autenication
tier 3 data tier
retrieve data and send it to tier 2 for processing
internet applications
email, www, text messaging