1 / 6

Understanding Local Area Networks: Fall '03 Course Material

Dive into the fundamentals of LANs in this comprehensive course material, covering protocols, open source software, network management, and security. Explore the benefits and challenges of LANs, MANs, and WANs.

nathaniel-ewing
Télécharger la présentation

Understanding Local Area Networks: Fall '03 Course Material

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related