18_091007_Chpt06 - MIS 301 Introduction to IT Management...

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Unformatted text preview: MIS 301 Introduction to IT Management Lizhen Xu IROM Department McCombs School of Business Chapter 6 Data Communications Chapter 6: Learning Objectives • Computer Network • Components of LAN • WAN • How encryption works • Purpose of firewall • VPN What is a Computer Network? Computer network – collection of computers that communicate over transmission lines Local Area Network (LAN) • LAN : Connects computers in single location – 2 to several hundred computers – One geographic area – Communication lines can be placed where the organization wants Wide Area Network (WAN) • WAN : Connects computers in different geographical areas – Two or more cities – Uses communication networks from vendors (licensed by government) Internet • Network of networks • Connect LANs, WANs, and other internets • Private networks of networks • Use a variety of communication methods and conventions – Seamless flow of data provided by layered protocol – Protocol : Set of rules that communicating devices follow Summary of LAN & WAN Networks LAN Components Switch • Special purpose computer that receives and transmits messages Network interface card (NIC) • Hardware that connects each device’s circuitry to the cable • Onboard NIC or card that fits into an expansion slot • MAC (media access control) address – Unique identifier for each NIC – Example: 00-1E-C9-4D-3E-B7 – 48 digits: 2 48 ≈ 280 trillion Media connections • Unshielded Twisted Pair (UTP) cable – RJ-45 connector (RJ-11 is the regular telephone line connector) – Maximum transmission length 100 meters (328 ft) Media connections • Optical fiber cables – High traffic or longer distance – Light rays reflected inside glass core (which is surrounded by cladding) – Uses ST and SC connectors SC: Standard Connector ST: Straight Tip IEEE 802.3 or Ethernet Protocol • IEEE : Institute for Electrical and Electronics Engineers • LAN standards committee – IEEE 802 Committee – Protocols always start with 802 • IEEE 802.3 is the most popular protocol for LANs nowadays, also called Ethernet protocol. What is a Protocol? • A protocol is a standardized means for coordinating an activity between two or more entities....
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This note was uploaded on 12/17/2010 for the course MIS 03765 taught by Professor Xu during the Fall '09 term at University of Texas at Austin.

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18_091007_Chpt06 - MIS 301 Introduction to IT Management...

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