Connecting: Networking, Online, WiFi, Internet, Intranet. Book: Chapters 17, 18
ITC QUIZ 4, due Sunday, November 2.
ITC ASSIGN 4, due Sunday, November 2.
- Connecting to the digital world
- Networking computers
Connecting to the digital world
- Connect to other computers
- Connect to other users
Networking between computers
- How Networking Works interconnected by communication channels that allow sharing of resources and information.
- A computer network, or simply a network, is a collection of computers and network hardware interconnected by communication channels that allow sharing of resources and information.
- They can be wired to each other through cables that transfer communication signals and data.
- They can also network to each other through wireless, which uses radio communication. Radio communication is radiation of electromagnetic signals through the atmosphere or free space.
- How Home Networking Works.
What networked computers do
- Link to home computers/devices: Computers networked at home can allow family members with different computers to share a printer, to share files with each other without transferring by physical saving and moving on USB flash drives, to synchronize files on devices, etc.
- Link to Local Servers: Computers networked with servers, like our classroom computers to the Seattle Central servers, can allow software and printers to be situated on the servers and logged in computers to access those devices and resources without having them actually installed on the actual local computer. Workplaces can share an Intranet space, can share appropriately licensed software, and can share hardware as well.
- Link to global servers: Computers that are networked, through broadband and WiFi, can connect with computers all over the city and world for shared information, email, browser searches, etc.
- Wired connections allow you to connect with other computers through physical wired technology that uses existing infrastructure.
- Host Ethernet Adapter: A physical Ethernet adapter that is integrated directly into the GX+ bus on a managed system. Needs an Ethernet cable to a router that in turn is wired to a service (like Broadband). Can automatically detect another computer connected with a straight-through cable and then automatically introduce the required crossover.
- Router: A router is a networking device that forwards data packets between computer networks, by connecting to two or more data lines from different networks. Example: a home network connected to the Internet.
- A router has interfaces for different physical types of network connections, (such as copper cables, fiber optic, or wireless transmission) and contains firmware for different networking Communications protocol standards.
- Modem: A modem (modulator-demodulator) is a device that modulates an analog carrier signal to encode digital information and demodulates the signal to decode the transmitted information.
- Voice Modem: A device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. Older computers had a modem installed, which could work with telephone lines to transmit communications data to other computers.
- Example: Comcast
- Analog Signal: An analog signal is continuous, meaning that there are no breaks or interruptions, and it can tolerate distortion.
- Digital Signal: Digital signals are not continuous, but use specific values to represent information, and distortion can create "noise" in the signal. Example:
- Switch: A switch (switching hub) is a device used on a computer network to physically connect devices together. Each networked device connected to a switch can be identified using a MAC address, allowing the switch to regulate the flow of traffic, which maximizes security and efficiency of the network.
- A MAC address (media access control address) is a unique identifier assigned to network interfaces for communications.
- Wireless connections allow you to connect with other computers using radio communication.
- Types of wireless include terrestrial microwave communication, Satellites/microwave radio waves, high-frequency radio and spread spectrum technologies, and Free-space visible or invisible light optical communication.
- Example: Comcast/Xfinity WiFi
- White Space is defined as the unused frequencies allocated to broadcasting services but that are left unused. In the United States, television stations ended analog signals in June 2009, which opened up this space.
- There are wireless LANs, WANs, MANs.
- Cellular Network: radio network distributed over land areas called cells, each served by at least one fixed-location transceiver,
known as a cell site
or base station.
- Router, Modem, Switch:
- Bluetooth: A wireless technology standard for exchanging data over short distances (using short-wavelength radio transmissions) from fixed and mobile devices, creating personal area networks (PANs) with high levels of security.
- Radio modems: Used for long-distance wireless connections, such as for direct broadcast satellite,WiFi, and mobile phones.
Some types of networks
- LAN: Local Area Network, which is a network that connects computers and devices in a limited geographical area such as home, school, or office building. LIKE Seattle Central
- HAN: Home area network, which is a residential LAN used for communication between digital devices typically used in the home, like personal computers and peripherals. LIKE puter, phone, table, printer.
- MAN: Metropolitan area network, which is a large computer network that usually spans a city or a large campus. LIKE Microsoft.
- WAN: Wide area network, which is a computer network that covers a large geographic area such as a city, country, or spans even intercontinental distances. Combines many types of communications media such as telephone lines, cables, and air waves. LIKE WA State government sites/usage.
- PAN: Personal area network, which is a is a computer network used for data transmission among devices such as telephones, tablets, remote car door unlocker, and personal digital assistants. Has an average range of less than 10 meters (about 30 feet).
- BAN: Body area network, which is wireless network of wearable computing devices, such as implants, wearable sensors, etc. LIKE pacemaker, insulin regulator, health-care reading uploads.
- Internet/The Web
- Internet Changes?
- An Intranet is a computer network that uses Internet Protocol technology to share information, operational systems, or computing services within an organization.
- An intranet is not open to external users, and usually required specific login and password procedures by the user.
- An intranet is accessible locally within a workplace or organization.
- An intranet may also be accessible through wired and/or wireless connection.
- An intranet exists to network computers and host information specific and proprietary to the organization.
- Any of the well known Internet protocols may be found in an intranet, such as HTTP (web services), SMTP (e-mail), and FTP (file transfer protocol).
The World Wide Web
What tools are on the Web?
- Browser interfaces: These let users navigate from one web page to another via hyperlinks embedded in the documents shown in the browsers. Browsers include IE, Firefox, Chrome, Safari, etc.
- Search Engines: A web search engine is software code that is designed to search for information on the World Wide Web, and relies on databases to store information in order to retrieve it for a user's search query. Examples include Google, Bing, Yahoo, etc.
- Web sites: A set of related web pages served from a single web domain. The StudioBast Class websiteis an example.
- Web email: web-based email applications that allows users to send electronic text messages between parties.
- VoIP: Voice-over-Internet Protocol, which allows the Internet to carry voice traffic instead of phone lines.
- Data Transfer: file sharing by emailing attached files, or using FTP to upload/download files to other computers or to a website. Also includes Streaming media (the real-time delivery of digital media).
- Cloud Computing Tools: Applications and resources in the web that allow users to use browsers for workflow instead of installing software on their computers.
The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to develop Web standards.
- Web standards contribute to the consistency in how web browsers function and the interfaces we see.
- Web standards are important for consistancy in web page code preparation, styles, and translation.
- The The W3C Markup Validation Service is a tool for web coders to use to evaluate whether html and CSS code is up to W3C standards and has the best chance of being translated properly on different browsers.
Internet / Web Issues
- Future of the Internet?
- Net Neutrality: Internet service providers and governments should treat all data on the Internet equally, not discriminating or charging differentially by user, content, site, platform, application, type of attached equipment, and modes of communication. (Quote per wikipedia)
- 2010 - the FCC approved "high-level rules of the road", created to encourage internet providers give everyone equal access to the WWW. However, on this month (Jan 2014) a federal appeals court struck this down in favor of allowing providers like Verizon to charge different customers different rates, impose tolls for higher-bandwidth sites, and generally allow bandwidth throttling for profit
- Open Internet Freedom (Brenda Cooper.com)
- And, a word from our Sponsor (just kidding) John Oliver
- File transfers - puter to drives
- File transfers - puter/drives to OneDrive / Dropbox
- File transfers - FTP (File Transfer Protocol)
- Edison Space
Let's transfer files!
- Check THIS web address:
- Follow THESE Steps
- ITC QUIZ 4: Due Sunday, November 2.
- ITC ASSIGN 4 Due Sunday, November 2.
- ITC EXTRA 3: Word Search, 2 points. Print out, have fun, turn in paper by Wednesday, November 12.