internet and WWW LU7 Flashcards
what is the internet
GAN
worldwide collection of computer networks that can be connected to share resources + communicate
how is info transferred using internet
travels through several interconnected networks
host
sender or receiver computer
how are hosts connected
bounded or unbounded communication links
routers
devices that determine paths data must travel along to get from one host to other using communication link
services on the internet
cloud storage
email
websites
cloud storage
storage of data online in the cloud
benefits of cloud storage
no need to buy new equipment
don’t need to manage + maintain expensive storage devices
automatic remote backup
only pay for storage space you use
can access anytime any place any device as long as internet
cons of cloud storage
unreliable internet connection can stop data access
no control over security of company-have to trust contract
company could close/irrecoverable disaster
protocol to send messages
SMTP
protocols to receive messages from mail server
POP IMAP
what is a website
collection of linked web pages that can be accessed using internet browser
how do you access websites
accessed by their domain name
TCP
transmission control protocol
responsible for making sure transmission gets from sender host to it’s destination
IP
internet protocol
identifies diff computers connected to the internet
advantages of TCP/IP Suite
allow direct access to the internet
enable communication between completely different computer systems
DNS
domain name system
addressing system that assigns unique names + numbers to hosts
hostname
domain name
made up of words
IP address
unique 32-bit number or 128 bit number
divided into four 8 bit numbers (0-255)
what is needed to connect computer to the internet
network card
software eg internet browser
device eg router
what is needed to connect mobile device to the internet
sim card
browser software
wifi capabilities
adsl
asymmetric digital subscriber line
data communications technology that provides fast data transmission over copper cables
fibre
data communications technology that uses light to transmit data at fast speeds and high capacities
wireless/wifi
uses radio frequency
cellular
sim card
3G+ 4G (
www
world wide web
mass of linked web pages that can be accessed via internet
interconnected docs connected by hyperlinks and URLs
navigate to diff pages via hyperlinks
runs ON the internet
web page
any document on the web
URL
uniform resource locator
unique address of web page on the internet
http://.
hypertext transfer protocol
rules for communicating on the internet
https://.
hypertext transfer protocol
safe for user to enter private information
web browser
program used to locate and view web pages
processes HTML code + displays in browser window
bookmarks,refresh,page tabs
search engine
program that searches documents on the web for specified keywords and returns list of documents where keywords were found and hyperlinks to relevant pages
what is the best way to search
state exactly what you want to find
identity keywords
use synonyms
logical operators
define logical relationship between search terms
reduces number of returns in internet searches
AND OR NOT
AND
+
must contain BOTH items
limits search results
OR
|
either one or several or all
more results returned
NOT
excludes keywords
when search use -
false positive results
many results that are not relevant to the query
role of user interface design
provide system for user to interact w a system such as website or computer program
CLI
command line interface
requires user to type commands to instruct system
GUI
graphical user interface
click on icons
why is command line interface tricky to use
user must learn large list of commands
commands can be misspelt
what do good user interface designs include
consistency
readability
layout
typography or use of colour (w/ theme)
how do we ensure good readability
ensure fonts are readable and available in all web browsers
use recognisable icons
reduce number of elements on screen
place elements in usable,recognisable locations
what is the 3 click rule
once entering a website a user should achieve their aim in a minimum of 3 clicks
how do you achieve navigation between pages
menu bars and buttons
headings
hyperlinks
how do you utilise typography to have a good user interface design
not too many colours
fonts dark and large enough to read
dark colours light background vice versa
use colours in expected way (red danger)
what elements go into the user interface design
readability
navigation
typography
layout
theme
consistency
In boolean logic what does a 1 stand for?
true
What are the types of connections used to connect large networks or personal devices to the internet
Asymmetric Digital Subscriber Line (ADSL)
Fibre
Wireless (WI-FI)
Cellular
what are the types of internet connections
adsl
fibre
wireless
cellular
