Chapter 7: Telecommunications, the Internet, and Wireless Technology Flashcards
network components, key networking tech, internet (tech), wireless networking
What is a network and it basic components?
Two or more connected computers
- computers, network interfaces, a connection medium, network operating system software & either a hub or a switch
What does the networking infrastructure of large corporations consist of?
- traditional telephone system
- mobile cellular communication
- wireless local are networks
- videoconferencing systems
- coporate website
- intranets & extranets
- many local & wide area networks, incl. Internet
What are the characteristics of contemporary networks?
Shaped by:
- client/server computing
- use of packet switching (slicing digital messages into packets to make communication more efficient)
- adaption of Transmission Control Protocol (TCP)/ Internet Protocal (IP) as universal communications standard for linking disparate networks & computers (incl. Internet)
- protocols provide a common set of rules to enable communication between different components in telcom
What types of networks are there?
- small personal area networks (PANs)
- local area networks (LANs): 500m radius
- wide area networks (WANs): several miles to entire continents
- metropolitan area networks (MANs): single urban area
- digital subscriber line (DSL): high-capacity internet connections
–> physical transmission media through copper telephone wire, coaxial copper cable, fiber-optic cable & wireless transmission
What is the INternet and how does it work?
Worldwide network of networks that uses the client/server model of computing & the TCP/IP network reference model
- every computer in the network is assigned a unique numeric IP address
- Domain Name System (DNS) converts IP-addresses to user-friendly domain names
- world-wide internet policies (org. & government bodies, such as Internet Architecture Boards (IAB))
Name some major Internet services
email, newsgroups, chatting, instant messaging, Telnet, FTP (File Transfer Protocol) & the web
What is the web?
- based on HTML (Hypertext Markup Language) and can display text, graphics, video & audio
- Extensible Markup Language (XML) as new paradigm: more powerful & flexible, tagging allows computer to process data automatically
- website directories, search engines & Really Simple Syndication (RSS) help locate information on the web
- information-sharing through RSS, blogs, wikis & social networking
What is the future web?
- more semantic search
- visual search
- prevalence of apps
- interconnectedness of devices (IoT)
New internet ech
- VoIP for voice transmission
- VPNs as low-cost alternative to private WANs
- Internet2: Testing leading edge tech for Internet
What are the technologies for Internet access?
Evolution toward high-speed, high bandwidth, digital packet-switched transmission
- 3G: 144 kbps - 2 mbps
- 4G: up to 100mps
- %G: up to gbps
What are the two cellular standards?
- Code Division Multiple Access (CDMA) –> US
- Global System for Mobile Communications (GSM) –> Europe & rest of world
What are the three standards for wireless computer networks?
- bluetooth for PANs
- WiFi for LANs
- Wimax for MANs
What is the RFID?
Radio frequency identification: Powerful tech for tracking movement of goods by using tags with embedded data about an item & its location (radio signals passed to computer for reading)
What are WSNs?
Wireless sensor networks: Networks of interconnected wireless sensing & transmitting devices that are embedded in the physical environment to provide measurements of many points over large spaces
