BASIC WEB DEVELOPMENT

• some notes that I want to share with you. Hope it will improve your knowledge. :)

here is the link if you want to try:

http://www.w3schools.com/html/
https://youtu.be/Odlb-u_ve2Y

step 1

step 2 :

step3 :

 step 4 : 

INTERNET APPLICATIONS (for teaching and learning)

Email

• electronic mail, is whish messages are passed from one computer user to another using a local network or by using modems over telephone lines.
• the massage is eventually delivered to the recipient mail box which is a file on his/her computer and it can be read using a mail program such as Eudora, Microsoft Mail and etc.
• by using email you will be able to:

1. send messages or more memos
2. receive and read the messages
3. reply to messages, image, video, slide show, documents  
4. foward to messages, image, video, slide show, documents
5. send the same messages to a list of people with one stroke
6. attach a text file such as a report to your email message
7. save mail to a file and print the message

Picture 1 : Example Gmail

https://www.youtube.com/watch?v=rd_7DcZ9DzU
https://www.youtube.com/watch?v=oxoM2TH3MBw
https://www.youtube.com/watch?v=bGEvBlA47cc
https://www.youtube.com/watch?v=l_vUJ0CCIAk

Video Conferencing

• video conferencing is the most basic form
• it is the transmission of synchrinised image (video) and speesh (audio) back and forth between two or more physically seperate locations, simulating an exchange as if the two (or more) participants were in the same physical conversation
• it is accomplished through the use of cameras, video monitor/display, microphones and speakers
• cameras are to capture and send video from sender's local endpoint.
• video monitors are to display video signal received from remote endpoints
• microphone are to capture and send audio signal from the sender's local endpoint
• speakers are to play audio received from remote andpoints

https://www.youtube.com/watch?v=DYu_bGbZiiQ

https://www.youtube.com/watch?v=JMOOG7rWTPg

WEB SEARCHING

• are Web sites designed specifically to help you find information on the Web.
• such as, Google, Bing, Yahoo! Search, Ask.com, and etc

Categories Web Searching

- there are four types :

1. Directories - a type of Internet search where categories are selected to locate information on the Internet.
2. Search engines - a software program used by a search site to retrieve matching Web pages from a search database.
3. Meta-search engine - is a search tool that uses another search engine's data to produce theis own result from the Internet. It can take input from a user and simultaneously send out queries to third party search engine for result.
4. Yellow pages - contain iformation about business

DIRECTORIES

META SEARCH

SEARCH ENGINES

YELLOW PAGES

 there are some video that you can watch. :)

https://www.youtube.com/watch?v=SkKC1BnuQsE
https://www.youtube.com/watch?v=R0DQfwc72PM
https://www.youtube.com/watch?v=7RlB1CJovTs
https://www.youtube.com/watch?v=tJQo_pw74ZY
https://www.youtube.com/watch?v=_GVfKWDhsto

INTERNET INFRASTRUCTURE

Internet - the largest & most well-known computer network, linking millions of computers all over the world.

Hierarchy Of Networks

1. from a single computer to LAN.
2. from LAN to ISP.
3. from ISP to WWW.

PICTURE 1: Hierarchy of network.

there is a video that you can watch :)
https://www.youtube.com/watch?v=4C1dDaftt0c&t=24s

Internet Service Provider (ISP)

• a business / other organization that provides Internet access to others, typically for free.
• ISPs include most communications & media companies, such as conventional & wireless phone providers, cable providers & satellite provider

PICTURE 2: Example of ISP.

Internet Protocol (IP)

• the language that computer use to communicate over the Internet.

Internet Protocol Address (IP Address)

• a numeric Internet address used to uniquely identify a computer on the Internet.
• commonly used by computers to refer to others computers.
• are numeric such as 207.46.197.32

PICTURE 3: IPv4 address

PICTURE 4: IPv6 address

Domain Name

• a text-based Internet address used to uniquely identify a computer on the network.

PICTURE 5 : Example of domain name

Hyper Text Transfer Protocol (HTTP)

• how messages are formed & transmitted, and what actions Web servers & browsers should take in response to various commands.
• examples, when you enter a URL in your browser, this actually sends an HTTP  command to the Web server directing it to fetch & transmit the requested Web page from a Web server onto a browser in order to view a Web page that is on the Internet.
• HTTP only transfers the contents of a web page into a browser for viewing.

Type of Internet connection

1. Dial-up connection - a type of Internet connection in which the computer or other device must dial-up and connect to a service provider's computer via telephone line before being connected to to the Internet.
2. Direct connection - a type of Internet connection in which the computer or other devices is connected to the Internet continually.
3. Conventional dial-up Internet access - dial-up Internet access via standard telephone lines.
4. Cable Internet access - fast, direct Internet access via cable TV lines.
5. DSL (Digital Subscriber Line) Internet access - fast, direct Internet access via standard telephone lines.
6. Satellite Internet access - fast, direct Internet access via the airwaves and a satellite dish.
7. Fixed wireless Internet access - fast, direct Internet access available in some areas via the airwaves.
8. Broadband over fiber (BoF) Internet access - very fast, direct Internet access via fiber-optic networks, also refered as fiber-to-the-premises (FTTP) Internet access.
9. WiFi hotspots - a location that provides wireless Internet access to the public.

PICTURE 6 : Type of Internet connection.

CONNECTING A NETWORK  : WIRED & WIRELESS (PART 2)

Wired Networking

1. Twisted pair cable - a networking cable consisting of wire stands twisted in sets of two and bound into a cable. Can be used with both analog and digital data transmission and commonly used for LAN. The pair of wire are twisted together to reduce interference and improve performance.
2. Coaxial cable - a networking cable consisting of a centre wire inside a grounded, cylindrical shield, capable of sending data at high speeds. Commonly used today in computer networks, for short-run telephone transmissions outside of the home and for cable television delivery. It is much less susceptible to interference and can carry more date more quickly.
3. Fibre-optical cable - a networking cable that utilizes hundreds of thin transparent fibres over which lasers transmit data as light. Transfer data represented by light pulses at speed of billion of bits per second. Commonly used for to the high-speed backbone lines of a network.

Wireless Networking

1. Infra Red (IR) - a wireless networking medium that sends data as infrared light rays. Sends data as infrared light rays over relatively short distances. Used to beam data between some mobile devices, television remote control, etc.
2. Blue tooth - a networking standard for very short-range wireless connections, the devices are automatically connected once they get within the allowable range. Blue tooth through clothing and other nonmetallic objects.
3. WiMAX - a networking standard that is faster and has a greater range than WiFi.
4. WiFi - a widely used networking standard for medium-range wireless networks

CONNECTING A NETWORK  : HARDWARE (PART 1)

Network Hardware

• various types of hardware are to create a computer network, to connect multiple networks together, to connect a computer or network to the Internet.
• there are 7 types of hardware.

1. Network Interface Card (NIC) - an expansion card through which a computer can connect to a network. Provides the physical connection between the network & computer workstation. Major factor in determining the speed & performance of a network.
2. Repeater - are devices that amplify signals along a network. Are available for both wired & wireless networks, repeaters for a wired & wireless network are often called range extenders. Are extend the length of transmission media.
3. Switch - a device used to connect multiple devices on a single (typically wired) network, forwards packets to only the intended recipient. Contains ports to which the devices on the network connect (typically via networking cables) & facilitates communications between devices. Identifies which devices connected to the switch is the one the data is intended for & send the data only to that device, rather than sending data out to all connected devices.
4. Bridges - allows the computer on the individual network/separate parts of a network to exchange information. Advice used to bridge / connect two LANs. Most common often used to connect wired devices wireless to a network. Can only transfer information from one network to another. Also used to split on overloaded network into smaller parts.
5. Routers - connect multiple devices to a cellular network. can direct/route information to the correct destination. Automatically detect if a part of the network is not working/slow. Contain fast processors to help prevent network slowdown. Prevent looping problems by analysis the information the transfer 7 directing it to the proper destination. Are often used to connect LAN to a WAN. Can also be used to break up the WAN into segment.
6. Hubs / Concentrator - a type of multiplex that combines multiple messages & sends them via a single transmission medium in such a way that all the individual messages are simultaneously active, instead of being sent as a single combined message. The main function is to connect the wires in the network. Help to eliminate errors on the network that are caused by electrical interference.
7. Workstation - a special computer designed for technical applications. Intended primarily to be used by one person at a time. Are commonly connected to a LAN & run multi-user operating system.
8. File server - a computer attached to a network that has the primary purpose of providing a location for shared disk access, shared storage of computer files such as documents, photographs, movie, etc, that can be access by the workstation are attached to the same computer network.

here are some videos that you can watch :)

https://www.youtube.com/watch?v=U1-2gGD9sYk

https://www.youtube.com/watch?v=IRBaMcAYA-s
https://www.youtube.com/watch?v=BAQidNNnZhU

hope you will enjoy it :)

COMPUTER NETWORKING AND TOPOLOGY

Computer Networking

• a connection between two computers by direct cabling is qualified to be a network.
• in the world of computer, networking is the practise of linking two/more computing device together for the purpose of sharing data.
• networking are built with a mix of computer hardware & computer software.

Networking Classification.

1. LAN (Local Area Network) - a computer that interconnects computers within a limited area & has its network equipment & interconnects locally manage. e.g: a residence, school, laboratory, university campus, office building.
2. MAN (Metropolitan Area Network) - a computer network that interconnects user with computer resources in a geographic area/region larger than that covered by even a large LAN but smaller than area covered by WAN. e.g: the cable television network available in many cities.
3. WAN (Wide Area Network) - a computer that extends over a large geographical distance. The Internet may be considered a WAN. e.g: use technology like ATM for connectivity over the long distance.
4. PAN (Personal Area Network) - a computer network used for data transmission amongst devices. PAN can be used for communication amongst the personal devices themselves. e.g: computers, telephones, tablets, printer, fax machine, scanner, PD A's.

Network Components

1. Terminal & Workstation - normally refers to data sources & destination. e.g : personal computer, terminals, workstation.
2. Network electronic devices (network hardware) - network hardware includes all computers, peripherals, interface cards & other equipment needed to perform data-processing & communications within the network. e.g : hub, bridge, router, switch gateway.
3. Network Software - the information, data/programming used to make it possible for computers to communicate/connect to one another. e.g : Windows 95, Win 98, NOS (Networking Operating System)
4. Network Architecture Standard - Blueprint of standards for a network consisting of items such as media interface, encoding methods, transmission protocols, routing protocols.
5. Transmission media - the physical pathway that connect computers & devices on a network. have two categories which are bounded & unbounded.

• Bounded - which provide a conduct from one to another. e.g : twisted-pair cable, coaxial cable & fibre-optic cable.
• Unbounded - media transport electromagnetic waves without using physical conductor. e.g : satellite communication, cellular telephony & microwave transmission.

The Use Computer Network

• sharing physical resources such as printers.
• provide a powerful communication medium among employees.
• using computer network, manufactures can place order electronically as needed. this reduces the needed for large inventories & enhances efficiency.
• home user can access information, communicate with other people & buy products & services with e-commerce.
• can be surfing the World Wide Web for information/just for fun.
• sharing public domain music, families sharing photos, movies & user downloading public software package.
• can be used by applications to carry audio & video.

Advantages Computer Network

1. Speed - networks provide very rapid method for sharing & transferring files. This method of transferring files (referred to as sneaker-net) is very time-consuming.
2. Cost - network able versions of many popular software programmes are available at considerable savings when compared to buying individually licensed.
3. Security - files & programmes on a network can be designated as "copy inhibit", so that you do not have to worry about illegal copying of programmes.

Network Topology

- indicates how a network is design or lay out.

- network topology has 2 part which are physical topology & logical topology.

• Logical Topology : the mapping of the 'flow of'' data between the nodes in the network.
• Physical Topology : indicates how the devices in the network are arranged.

- there are 4 most common physical topology.

1. Bus network - consists of a continuous length of cable that connects 2 / more devices together. A bus called a backbone network. Each end of the cable on the bus network must have a terminator.
2. Star network - consists of individual computer connected to a centre point on the network. Each computer connected to a centre network connector, called a hub.
3. Ring network - consists of individual computer connected to a single length of cable arranged in a ring. The information travels in one direction only. There is no beginning / end in a ring network.
4. Hybrid network - a network structure used a mixture of many different of network structure. Hybrid network structure such as ring, star, bus network in one large network.

 

there are some video that you can watch :)
https://www.youtube.com/watch?v=Ap0UrGYsxrk
https://www.youtube.com/watch?v=osWctsnbMa4

HAVE FUN !!!   😉 😊