1 / 13

Local and Wide Area Networks: Understanding the Pieces

Local and Wide Area Networks: Understanding the Pieces. John H. Porter University of Virginia Coastal Research Center. WHY have a LAN (Local Area Network) hooked to the Internet?. Sharing of Resources disks printers Access to Internet Electronic Mail WWW pages use net resources

olaf
Download Presentation

Local and Wide Area Networks: Understanding the Pieces

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. Local and Wide Area Networks: Understanding the Pieces John H. Porter University of Virginia Coastal Research Center

  2. WHY have a LAN (Local Area Network) hooked to the Internet? • Sharing of Resources • disks • printers • Access to Internet • Electronic Mail • WWW pages • use net resources • Control of setups of multiple computers

  3. Ethernet - How does it work? • Ethernet is the most common system used on LANs • It operates the same way a group discussion works • wait for a pause • start to talk - but stop if someone else talks • in case of “collision” wait for a pause and try again

  4. Network Interface Cards (NICs) for computers Category 5 (CAT5) cables running to Hubs or Switches Optical cable to interconnect hubs and switches Server computers for printing & disk A router to connect them to the Internet A high speed telecommunications line to an Internet Service Provider (ISP) What are the PARTS you need?

  5. Server PC PC PC PC Graphical Network Hub Internet Service Provider Router Hub CAT5 Cable Optical or CAT5 Cable ISDN,T1 etc.

  6. Network Interface Cards • Need one for each PC connected to the network • Most modern MacIntosh computers have Ethernet capabilities built in • Cost: $20-$100

  7. CAT 5 Cables • “twisted pair” copper wires • Have a RJ-45 connector at each end • looks like an extra-wide modular phone plug • Run between the computer and its “hub” • Cost: about $250 per installed “drop” • 2 wall jacks

  8. Hubs and Switches • Hubs connect PCs together to form a network • in a minimal LAN, this might be all you need • Switches are like Hubs but are “smart” enough to optimize network traffic that passes through them • Cost: $50-$200 for most Hubs, $1,000-$3,000 for most switches • Cost depends on number of ports

  9. Optical or CAT5 Cabling • Hubs, switches and routers can be connected using optical cables or CAT5 wiring • Optical cables are preferred for connecting buildings due to reduced susceptibility to lightning etc.

  10. Server(s) • A server is a “normal” PC usually running Windows NT or Linux that shares disks and printers connected to it with other computers on the net. • It can be configured to provide security so that users only have access to “their” part of the system • Cost: $3,000-$10,000

  11. Router • A router is a “very smart” network switch. It calculates the most efficient route for network packets to take. • Cost: $1,000-6,000

  12. Internet Connection • A Internet connection to an Internet Service Provider (ISP) can take many forms: • modem (56KB/S max) ($20/month) • ISDN (64KB/S or 128KB/S) ($200/month) • Leased line • T1 (1.5 MB/sec) ($1,000/month) • DSL

  13. Server PC PC PC PC Cutting Costs: The Ultimate Mini-Net Server runs either WinNT or Win98 with Wingate 3.1 software (http://www.wingate.com) Internet Service Provider 56K modem CAT5 Cable Hub Serial Cable Regular phone line Cost: NICs $60+Hub $50+Cables $40+Software $40= $190 Recurrent cost: $20/month for ISP fees

More Related