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Basic Networking

Basic Networking. Vermont Department of Libraries Prepared by Rob Geiszler. Some Fundamental Concepts. THE Network A little history (DARPA – ARPA – DARPA) A little technology Packet switching The packet header Addresses & Licenses License Classes

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Basic Networking

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  1. Basic Networking Vermont Department of Libraries Prepared by Rob Geiszler

  2. Some Fundamental Concepts • THE Network • A little history (DARPA – ARPA – DARPA) • A little technology • Packet switching • The packet header • Addresses & Licenses • License Classes • Internet Corporation for Assigned Names and Numbers • The Domain Name Server

  3. DNS System http://commons.wikimedia.org/wiki/File:Domain_name_space.svg

  4. Your network Lucid, http://commons.wikimedia.org/wiki/File:Homenet.svg

  5. The NIC futase_tdkr , http://commons.wikimedia.org/wiki/File:NIC_on_RTL8139C.JPG

  6. Your Network and THE Network • Addresses, Addresses, Addresses • The MAC address • Public Addresses • Private Addresses • 192.168.x.x • 10.0.x.x • Static addressing vs. Dynamic Host Configuration Protocol • ipconfig • ipconfig /all

  7. Interpreting ipconfig

  8. The Router • Configuration issues using the configuration screens • Router default accounts and passwords: • http://www.phenoelit-us.org/dpl/dpl.html • http://www.routerpasswords.com/index.asp • Or check the manufacturer’s website • URLs usually 192.168.0.1, 192.168.1.1 or 192.168.2.1 • Remember the RESET button

  9. Network troubleshooting • Check ALL the connections! • Check ALL the connections – AGAIN! • Ipconfig – are all the ducks in a row? • ping – are we connected? • To test for connection • To test for DNS • tracert – where does the connection fail?

  10. Network protocols and : ports • TCP/IP • http:80 • FTP:21 • SSH:22 • Telnet:23 • smtp:25 • DNS:53 • IMAP:143 • https:443 • dhcpv6:556 (client) • dhcpv6:557 (server)

  11. Cables – CAT 5 & 6 ← Regular (Straight) T568B Crossover →

  12. Jacks – CAT5 & 6

  13. Adding wireless • What’s different about wireless? • The configuration screen • Security on wireless routers • When? • Keys • WEP • WPA • WPA2 • Access points and repeaters

  14. Some helpful utilities • Ipconfig • ping • Tracert • Softperfect Network Scanner: • http://www.softperfect.com/products/networkscanner/

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