Unit 7 Internet And WWW Flashcards
What is the internet
A global network of networks
What is the purpose of the internet
Sharing resources, communication, storage
What are examples of basic services of the internet
Email services and web sites
What are the three things involved when there is communication on the. Internet
Hosts, routers and links
What is a host
The sender or receiver of information — a node
What is a link
Wired or wireless media that connects hosts
What is a router
A specialised devices that connects networks together (it is a path(s) along which data travels from one host to another using a communication link)
What is a router usually used for
A router is usually used to connect an organisations network to an internet service providers network to enable internet access
What resources can you share in the internet
processing power, files (like music, videos, photos, movies etc), and storage
What are basic services on the internet
Cloud storage, email and websites
What is cloud storage
A remote service accessed via the internet
What is the opposite of remote
Local
What are examples of ISPs in sa
Vodacom, MTN, Telkom, Vumatel, Rain etc
What are the benefits of using cloud storage
-You do not have to buy new equipment
-you do not have to maintain expensive storage devices
-you can access the cloud storage at any time from any place and from any computer as long As you are connected to the internet
-you only pay for the storage you are using
-you have an automatic remote backup
What are some concerns about using cloud storage
- An unreliable data connection can stop data access
- security of your data is a concern as you have no control over the security of the cloud storage company other than to trust their contract
- the company storing the data could close or have an irrecoverable disaster.
What is email short for
Electronic email
What is an email
Similar to a letter, an email is sent via the internet to any recipient who has an email address.
What protocol does email use for sending messages
SMTP
What protocol does email use for receiving messages
POP and IMAP
What is a website
A named location on the world wide web located using a URL
What doe WWW stand for
World wide web
What does URL stand for
Uniform Resource Locator
What does http stand for
Hypertext transfer protocol
What is hyper text
Html (hyper text markup language) is the language of the web
What is a protocol
A set of rules regarding communication (sending and receiving)
What are the most common protocols used by computers on the internet.
TCP and IP
What does TCP stand for
Transmission control protocol
What does IP stand for
Internet protocol
What is TCP responsible for
Making sure that a transmission gets from the sender host to its destination host
What is IP responsible for
It identifies the different computers connected to the internet by using an IP address
What is an IP address
4 decimal numbers separated by dots and they will uniquely identify a device in a network
What are TCP and IP called collectively
The TCP/IP suite
What is the advantage of the TCP/IP suite
They allow direct access to the internet and they enable communication between computer systems that may be completely different
What does DNS stand for
Domain name system
What is DNS
An addressing system used by the internet to assign names and numbers to the hosts /computers that are connected
What does each host connected to the internet have
A domain name (also called host name) and a unique IP address to identify it.
What is a hostname made out of
Words that are easy for humans to understand
What is an IP address made out of
A 32 bit or 128 bit number which is difficult for humans to read.
What does the IPv4 addressing system use
It uses 32 bits divided into four 8 bit numbers (ranging from 0-225) separated by dots.
What can you do if you know the IP address of a destination computer
You can type it instead of a URL
About how many IP addresses can be made with the IPv4 system
2^32 = 4.29 billion addresses
Why has IPv6 been introduced
Because all the IPv4 addresses have been assigned to various institutions leading to a shortage of addresses
What do you need to connect to the internet for a computer
For a computer:
- a network interface card (NIC) or wireless enabled computer
- software such as an internet browser
- a device such as a router/ wireless router which would enable you to either connect to a physical line or wireless access point
What does WAP stand for
Wireless access point
What do you need to connect to the internet for a mobile device
A computer with a:
- sim card for access to mobile data
- WIFI capabilities to enable the device to connect to a WIFI access point which is in range of the device or a personal hotspot
- a browser software app installed on the device.
What are the types of connections
Fibre, wireless and cellular
What is fibre
A data communications technology that uses light to transmit data at superfast speeds and high capabilities
What does WIFI stand for
Wireless fidelity
What is a wireless connection
Wireless or WIFI does not use telephone lines or cables to connect to the internet. Instead, it uses radio frequency.
What is cellular
Is you are using a sim card in your device then you can access the internet from anywhere. The speeds can vary depending on the provider but the most common are 3G and 4G speeds.
What does 3G stand for
3rd generation cellular network
What does 4G stand for
4th generation of cellular wireless standards
What is the world wide web
A mass of linked web pages which can be accessed via the internet
How can you display hypertext documents
On a web browser and these documents can contain text, images, videos, sound and other multimedia
What connects documents on the web
Through hyperlinks and URLs
What is a web page
A document on the web which contains text, graphics, audios or hyperlinks
What is a website
A web site is made up of a number of web pages together. It always has a home page
What is http://
Rules for communicating on the internet
What does the s mean in https mean
That the web page or site is safer in terms of user entering private information
What is web browser
Software used that processes HTML to display pages or contents of the World Wide Web
What are examples of web browsers
Google chrome, Microsoft edge, Apple safari, Mozilla Firefox, Opera.
What are additional features on a web browser
Bookmark, page tabs, refresh, navigation etc
What is a search engine
A program that searches documents on the web for specified keywords and returns a list of documents where the keywords were found with hyperlinks to the relative pages
What do you need to do to ensure successful searching
State exactly what you want to find
Identify keywords
Use synonyms
What does every and do to the search
Reduces results returned
What does every or do to the search
Increases the results returned
What does every not (“-“) do to the search
It excludes certain results
What are false positive results
Results that are not relevant to the query
What is the symbol for and
+
What is the symbol for Not
-
What is the symbol for or
|
What is the order of operations for searches
Not
And
Or
What does UIF stand for
User interface design
What is the role of a user interface
To provide a system for a user to interact with a website or computer program
What does CLI stand for
Command line interface
What does a good user interface design include
Consistency, readability, layout, typography, or use of colour usually embodied in a theme
What does a user experience designer do
They ensure the web site or computer program is:
-Easy to use
- has minimal steps
- uses the appropriate colour, font, layout
What does a user experience designer do
They ensure the web site or computer program is:
-Easy to use
- has minimal steps
- uses the appropriate colour, font, layout
What does good readability focus on
Reducing the number of elements on the screen. The elements of the interface must be placed in locations that make them easy to see, recognise and use
What does good navigation focus on
The three click rule, menu bars and buttons, headings
What is the three click rule
A user should be able to do anything on a web site or application Within three clicks
What makes a good typography
Large enough to be readable, lighter colours on dark backgrounds and darker fonts on light backgrounds, use colours in the way the user would expect (red danger, yellow caution, green safety etc), and don’t include too many colours
What makes a good layout
Putting the most important elements of the page where the reader is most likely to look
What makes good consistency
Elements that behave the same should be consistent in colour, design and location on the screen
