Vocab (week 1) Flashcards
The Internet
A global system of interconnected computer networks that use the internet protocol suite (TCP/IP) to link devices worldwide.
- it is a network of networks that consist of private, public, academic, business and government networks
- linked by a broad array of electronic, wireless and optical networking technologies
The internet…
connects networks together. “Interconnected networks”
Computer network
2 or more computers linked together using: cables, radiowaves (wifi or bluetooth), satellites or telephone lines.
why do we link computers together?
To exchange files, to allow for communication, share resources like printers. etc.
A network of 2 computers
- a single cable
- two cables and another device
- wireless : bluetooth or wifi signals
Most common topology to connect computers?
Star Topology
LAN
Internal network of computers (offices, homes, short distance)
- Local Area Network
- primarily uses ethernet cables to connect
- only works for short distances
- can include wifi signals
WAN
Wide Area Network: Unlimited by geography (connects computers from anywhere in the world)
can use the following:
- Satellites
- mobile towers
- tv cables
- fibre optics
- telephone lines
How do we connect to the internet?
- using an ISP or an Internet Service Provider
What is an ISP
A company people pay to get access to the internet, usually you can buy or rent the modem from them.
- Usually they have polices like Acceptable Use Policy or Terms of service. These may prevent copyright, video games, illegal content and online services, harassment.
Internet vs WWW
- internet - the actual network - the hardware
- ex: using internet but not the web - using an app on your phone, sending an email, sending an instant message
- Web - the content served up through this hardware. the collection of billions of digital pages that are viewable thorugh web browswer software
- browsing web pages (google, youtube, ucr’s webstie)
Transmission mediums
- Electricity (telephone lines, ethernet cables tv cables.)
- Electromagnetic waves (wireless)
- Light (optic fibers)
data transmission is different for short and long distances
- WAN
- phone cables and tv cables
- power lines
- cellphone signals
- satellite signals
- fiber optics
- LAN
- ethernet cables
- wifi signal
Wifi
- wireless networking technology
- uses radio waves
- to provide wireless high-speed internet and network connections.
Hotspot
A physical location where people may obtain internet access, typically using wifi technology
Fiber optics
work using total internal reflection
note: - How do you think continents are connected in the internet?
- Using submarine fiber optic cables!
- Fiber optic cable sare the fastest and best medium for long distance
Markup language
- a system for annotating a document in a way that is syntactically distinguishable from the text
- interpreted by the browser
- HTML, XML, XHTML, some examples
- used to present information
Programming language
- Formal language that contains a set of instructions used to produce an OUTPUT
- Compiled by a compiler or interpreted by an interpreter
- C,C++, Java, Python and assembly are some examples
- used to give instructions to a computer to perform a particular task
HTML
HTML files consist of nested HTML elements
Dynamic webpapge
- dynamic: the user is able to play a role in what you see,
- ex is amazon, the page changes based on what you click on.
static webpage
the page is created once and shows the same content
- no interaction with the user
- you cannot change what you say only the owner is able to do so.
HTML, HYPERLINKS, WWW
- Web pages written in HTML include hyperlinks that when followed from a web browser allow the user to jump from one web page to the next.
- The combination of HTML web pages connected by hyperlinks and internet protocols for data transmission form the basis for the world wide web.
- HTML: web pages are written in a textual language called HTML
- HyperText MarkupLanguage
- hypertext: links that connect to other pages and content
- tags for annotating and structuring text
- HTML is like IOS and there are recent versions - HTML5
