Chapter 7 - Chapter 7 Telecommunica3ons the Internet and Wireless Technology Part 1 Networking Basics •  Iden3fy the principal components of

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Unformatted text preview: Chapter 7. Telecommunica3ons, the Internet, and Wireless Technology Part 1. Networking Basics •  Iden3fy the principal components of telecommunica3ons networks and key networking technologies •  Describe the main telecommunica3ons transmission media and types of networks •  Explain how the Internet and Internet technology work and how they support communica3on and e‐business •  Iden3fy the principal technologies and standards for wireless networking, communica3on, and Internet access •  Assess the value to business of radio frequency iden3fica3on (RFID) and wireless sensor networks Learning Objec3ves Produced by Dr. Brian Janz 1 What Is A Computer Network? •  Two or more connected computers •  Major components in simple network – Client computer – Server computer – Network interfaces (NICs) – Connec3on medium – Network opera3ng system – Hub or switch – Router Components of a Simple Computer Network Figure 7-1 Produced by Dr. Brian Janz 2 Types of Networks •  Local‐area networks (LANs) – Client/server or peer‐to‐peer – Ethernet – physical network standard – Topologies: star, bus, ring •  Campus‐area networks (CANs) •  Metropolitan‐area networks (MANs) •  Wide‐area networks (WANs) Network Topologies Figure 7-6 Produced by Dr. Brian Janz 3 Networks In Large Companies •  Components can include: – Hundreds of local area networks (LANs) linked to firm‐wide corporate network – Various powerful servers •  Web site •  Corporate intranet, extranet •  Backend systems –  Mobile wireless LANs (Wi‐Fi networks) – Videoconferencing system – Telephone network – Wireless cell phones Corporate Network Infrastructure Figure 7-2 Produced by Dr. Brian Janz 4 Communica3ons Networks •  Physical transmission media –  Twisted telephone pairs –  Coaxial cable –  Fiber op3cs and op3cal networks •  Wireless transmission media and devices –  Microwave –  Satellites –  Cellular telephones •  Transmission speed/capacity –  Hertz –  Bandwidth Signals: Digital vs. Analog •  Modem: Translates (or “MODulates”) digital signals into analog form, and then retranslates (or “DEModulates”) back to digital Figure 7-5 Produced by Dr. Brian Janz 5 Packet Switching •  Method of slicing digital messages into parcels (packets), sending packets along different communica3on paths as they become available, and then reassembling packets at des3na3on •  Previous circuit‐switched networks required assembly of complete point‐to‐point circuit •  Packet switching more efficient use of network’s communica3ons capacity Packet‐Switched Networks and Packet Communica3ons Figure 7-3 Produced by Dr. Brian Janz 6 TCP/IP and Connec3vity •  Connec3vity between computers is enabled by protocols –  Protocols: Rules that govern transmission of informa3on between two points •  Transmission Control Protocol/Internet Protocol (TCP/IP) –  Common worldwide standard that is basis for Internet •  4‐layer DoD reference model for TCP/IP –  Applica3on layer –  Transport layer –  Internet layer –  Network interface layer The Transmission Control Protocol/Internet Protocol (TCP/IP) Reference Model Figure 7-4 Produced by Dr. Brian Janz 7 Chapter 7. Telecommunica3ons, the Internet, and Wireless Technology Part 2. The Global Internet The Global Internet •  What is the Internet? •  Connec3ng to the Internet – Internet service providers (ISPs) •  DSL, cable, satellite, T lines (T1, T3) •  Internet addressing and architecture – IP addresses – The domain name system •  Hierarchical structure •  Top‐level domains Produced by Dr. Brian Janz 8 The Domain Name System Figure 7-8 The Global Internet •  Internet Architecture –  Trunk lines (backbone networks) –  Regional networks –  ISPs •  Internet Governance –  No formal management –  Policies established by professional, government organiza3ons, e.g., IAB, ICANN, W3C •  The Future Internet –  IPv6 –  Internet2, NGI Produced by Dr. Brian Janz 9 Internet Network Architecture Figure 7-9 Internet Services •  E‐mail •  Chaeng and instant messaging •  Newsgroups •  Telnet •  File Transfer Protocol (FTP) •  World Wide Web •  Voice over IP (VoIP) •  Virtual private networks (VPNs) Produced by Dr. Brian Janz 10 Client/Server Compu3ng on the Internet Figure 7-10 How Voice Over IP (VoIP) Works Figure 7-11 Produced by Dr. Brian Janz 11 A Virtual Private Network (VPN) Over the Internet Figure 7-12 The World Wide Web •  HTML (Hypertext Markup Language): – Formats documents for display on Web •  Hypertext Transfer Protocol (HTTP): – Communica3ons standard for transferring web pages •  Uniform resource locators (URLs): – Addresses of web pages •  e.g., hgp:// •  Web servers •  Sohware for loca3ng and managing web pages Produced by Dr. Brian Janz 12 The Global Internet: Web 2.0 •  Second‐genera3on Internet‐based services enabling people to collaborate, share informa3on, and create new services online •  Cloud compu3ng, mashups and widgets •  Blogs: Chronological, informal websites created by individuals using easy‐to‐use weblog publishing tools •  RSS (Really Simple Syndica3on): Syndicates Web content so aggregator sohware can pull content for use in another seeng or viewing later •  Wikis: Collabora3ve websites where visitors can add, delete, or modify content on the site The Global Internet: Web 3.0 •  Efforts to make using Web more produc3ve –  Inefficiency of current search engines •  Seman3c Web –  Collabora3ve effort to add a layer of meaning on top of Web, to reduce the amount of human involvement in searching for and processing Web informa3on •  Other, more modest views of the future Web –  Increase in cloud compu3ng, SaaS –  Ubiquitous connec3vity between mobile and other access devices –  Make Web a more seamless experience Produced by Dr. Brian Janz 13 Intranets and Extranets •  Intranets –  Use exis3ng network infrastructure with Internet standards/ sohware developed for the Web –  Create networked applica3ons that can run on many types of computers –  Protected by firewalls •  Extranets –  Allow authorized vendors and customers access to an internal intranet –  Used for collabora3on –  Firewall protec3on cri3cal Chapter 7. Telecommunica3ons, the Internet, and Wireless Technology Part 3. Wireless Telecommunica3ons Produced by Dr. Brian Janz 14 The Wireless Revolu3on •  Wireless devices – PDAs, BlackBerry, smart phones •  Cellular systems – Compe3ng standards for cellular service •  United States: CDMA •  Most of rest of world: GSM – Third‐genera3on (3G) networks •  Higher transmission speeds suitable for broadband Internet access Wireless Computer Networks and Internet Access   Bluetooth (IEEE 802.15) –  Links up to 8 devices in 10‐m area using low‐ power, radio‐based communica3on –  Useful for personal networking (PANs) Produced by Dr. Brian Janz 15 Wi‐Fi (IEEE 802.11) •  Set of standards: 802.11a, 802.11b, 802.11g, 802.11n •  Used for wireless LAN and wireless Internet access •  Use access points: Device with radio receiver/ transmiger for connec3ng wireless devices to a wired LAN •  Hotspots: One or more access points in public place to provide maximum wireless coverage for a specific area •  Weak security features WiMAX (IEEE 802.16) •  Wireless access range of 31 miles •  Require WiMAX antennas •  Sprint Nextel building WiMAX networks Produced by Dr. Brian Janz 16 Wireless Sensor Networks •  Networks of hundreds or thousands of interconnected wireless devices embedded into physical environment to provide measurements of many points over large spaces •  Used to monitor building security, detect hazardous substances in air, monitor environmental changes, traffic, or military ac3vity •  Devices have built‐in processing, storage, and radio frequency sensors and antennas •  Require low‐power, long‐las3ng bageries and ability to endure in the field without maintenance Radio Frequency Iden3fica3on (RFID) •  Small tags with antenna and embedded microchips containing data about an item as well as loca3on •  Tags transmit radio signals over short distances to special RFID readers, which send data over network to computer for processing –  Ac3ve RFID: Tags have bageries, data can be rewrigen, range is hundreds of feet, more expensive –  Passive RFID: Range is shorter, also smaller, less expensive, powered by radio frequency energy •  Common uses: –  Automated toll‐collec3on –  Tracking goods in a supply chain •  Reduced cost of tags making RFID viable for many firms Produced by Dr. Brian Janz 17 How RFID Works Figure 7-17 Produced by Dr. Brian Janz 18 ...
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This note was uploaded on 02/24/2011 for the course MIS 7650 taught by Professor Janz during the Spring '11 term at U. Memphis.

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