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91-811 Local Area Networks – Fall ‘03

91-811 Local Area Networks – Fall ‘03. Agenda: Introduction Roll Call Syllabus review Contact Information Description and Goals Schedule Textbook Assignments Readings Grading Blackboard Site. Definitions Network Protocol Open vs Closed LAN / MAN / WAN Lab 1. Definitions.

nathaniel-ewing
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91-811 Local Area Networks – Fall ‘03

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  1. 91-811 Local Area Networks – Fall ‘03 Agenda: • Introduction • Roll Call • Syllabus review • Contact Information • Description and Goals • Schedule • Textbook • Assignments • Readings • Grading • Blackboard Site • Definitions • Network • Protocol • Open vs Closed • LAN / MAN / WAN • Lab 1

  2. Definitions Network: Two or more nodes which can communicate with each other; also, the structure over which the communication flows • TV/Radio Network • Professional Network (Heinz Network NY, Pgh, etc) • Highway Network • Network of blood vessels or nerve endings in the body • Computer Network Protocol: Set of rules for communicating • Between people - “Hi”, “How are you”, “Goodbye”; handshakes; pauses in conversation; personal space; tone of voice. • Between political entities – White House Protocol Office. • Between computers – TCP/IP, HTTP, etc. Must be explicitly defined in great detail. • What happens when you don’t follow the protocol?

  3. Open vs Proprietary Protocols Historically, most protocols were proprietary (closed). • Used by vendors to lock in customers (good for them, bad for you) • Competitors used reverse engineering techniques (hard, error-prone) • IBM SNA, Token Ring; Microsoft SMB (file/print sharing) • Intellectual property and patent restrictions Internet is based on open protocols • Specification freely available for download • Working code implementing protocols (open source) • Anyone can implement for any system – critical mass • Good for customers. Bad for business? Not necessarily, just bad for old business models • TCP/IP, HTTP (WWW), DNS, FTP, Telnet... Leads to a larger Open Source movement

  4. Open Source Software for LAN Environments • Most prominent: • Linux – Powerful Unix based operating system • Apache – Web server run by 64% of hosts (Microsoft IIS has 26%) • OpenOffice – Suite of office applications; usable in place of MS Office • Samba – Provides SMB (Windows-type) file sharing on non-MS OS’s • Network management: Big Brother, Nagios, MRTG • Network security: Nessus, Snort, Ethereal, nmap • Three main advantages: cost, reliability, flexibility • See www.opensource.org FAQ and Advocacy sections • Lower costs come from: • No software licensing fees • Reduced hardware upgrades - usable on otherwise obsolete computers • Reduced support costs • Negatives: Unfamiliar to most; sometimes unpolished; • fewer support personnel and materials available

  5. LAN/MAN/WAN • Local Area Network / Metropolitan Area Network / Wide Area Network

  6. LAN/MAN/WAN Summary Table Ownership, Distance, Data Rate, Monthly Cost, User Base, Scope

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