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Network design 1
The document discusses considerations for designing local area networks (LANs), including needs analysis, technological design, and cost assessment. It then provides two examples of LAN designs: 1. A small company LAN with 20 workstations across two rooms, requiring email, database access, and printing. Three design options are presented with varying levels of functionality and cost. 2. A medium-sized, multi-floor law firm LAN with 50 users across two floors. Issues with multi-floor designs are outlined. Three gold, silver, and bronze design options are presented for the 4th and 5th floors. Costs can vary significantly depending on the specific hardware chosen.
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Network design 1
- 1.
- 2. Introduction Issues inthe design of a Local Area Network (LAN): Needs analysis – What do the users need from this network? Technological design – What devices are needed to properly support the demands that will be put on the network? Cost assessment – Can I afford it?!
- 3. Looking For Hardware? CDW: www.cdw.com Useful catalog of basic and professional grade networking equipment
- 4. White’s LAN Example What type of system will interconnect twenty workstations in one room and 15 workstations in another room to a central server, which offers: Internal e-mail A database that contains all customer information High quality printer access
- 8. Nomenclature P1 Typical PC(1.5GHz) P2 High Traffic PC (2.8GHz) PR Printer FS File Server EF Email/Fax Server M Modem H Hub SW Switch R Router
- 9. An easier wayto draw (ALT I) P1 P1SWSW x16 x12 Technical Services Administrative Services Cat5e Cat5e Wiring Closet FO FS FO Maintenance Room P1 P1PR PR x4 x3 Cat5e R T1
- 10. An easier wayto draw (ALT II) P1 P1SWSW x20 x15 Technical Services Administrative Services Cat5e Cat5eCat5e DS FO Maintenance Room SW Cat5e MS FO PR PR x4 x2 Cat5e Cat5e DSL
- 11. To identifyeach connection between sites: d = distance of the connection (usually shown in either miles or kilometers) s = security level (high, medium, low, or none) du = duplexity (full duplex, half duplex, or simplex) dr = data rate desired (in bps) l = latency, or acceptable delay time across the network (usually in milliseconds, or ms) QoS = Quality of Service (CBR - constant bit rate, VBR - variable bit rate, ABR - available bit rate, UBR - unreliable bit rate, or none) De = Delivery rate (throughput percentage) Network Modeling
- 13. Summary In orderto construct a LAN, you must: Carry out a needs analysis, in order to develop a technological design, and cost assessment You need to know the needs of the company before you can design the LAN, but not every company can afford the LAN they need! The designs should: Show the logical connection of users Show the support for traffic between nodes (connectivity maps) Allow a technically-competent technician to install the physical LAN layout
- 14.
- 15. Overview Designing aLAN for a small company Needs analysis Technology design Cost assessment
- 16. Design in threes 1.Cheapest alternative: Meets only the core requirements, but cheap 2. Most likely: Meets critical requirements close to the stated budget 3. Gold-plated Takes advantage of the best of available products
- 17. Nomenclature P1 Typical PC(1.5GHz) P2 High Traffic PC (2.8GHz) PR Printer FS File Server EF Email/Fax Server M Modem H Hub SW Switch R Router
- 18. Design 1-1 H FS M Internet (ISP) SharedEthernet P2 P2 P1 P1 PR 6 Consultants 1 Assistant 1 Manager 1 Assistant
- 19. Design 1-2 SW SW Travel ConsultantsManagement/Clerical Internet (ISP) M FS EF P2 P1 P1PR P2 P2 P2 PR 1 Manager2 Assistant 6 Consultants
- 20. Design 1-3 R SWSW TravelConsultants Management/Clerical Internet (T1) FS EF P2 PR P2 P2 PR FS P2 PR P2 P2 FO FO 6 Consultants 2 Assistants Manager 2 Printers
- 21. Decision time! Whichone will work? Which one works best? Which is best value for money? Therefore, which one would you recommend?
- 22.
- 23. Overview Designing aLAN for a medium-sized company Needs Analysis Technology Design Cost Assessment
- 24. Issues with multi-floordesigns Can design top-down (backbone to segments), or bottom-up (segments to backbone). Will probably need: Backbone to connect the floors Wiring closet to store connection devices At least one Router A server farm in a secure room
- 25.
- 26. Design in threes Cheapest alternative: Meets only the core requirements, but cheap Most likely: Meets critical requirements close to the stated budget Gold-plated Takes advantage of the best of available products
- 27. Design: Floor plan Floor4 Floor 5 Attorneys+Legal Sec.Reception+Others Recep- tion Clerical Legal Sec. Partners/ Associates Partners/ Associates Network Room Waiting
- 28. Design: The segments 5th 4th4thFloor Wiring Closet 5th Floor Wiring Closet Server Farm 30 Attorneys + 10 Legal Sec. 10 Legal Sec. 6 Clerical + Office Mgr
- 29. Design 1 5th 4th R P1 PR SW T1 FS EF SW P1 PR 10Legal Sec. 6 Clerical 1 Mgr. 24 port 48 port X3 20 Attorneys 10 Legal Sec. P2
- 30. Design 2: 4thFloor SW 5th Floor SW P1 PR 6 Clerical 1 Mgr. SW P1 PR 10 Legal Sec. 8 port 16 port 8 port X2 X5 X7
- 31. Design 2: 5thFloor R 4th Floor T1 SW SW 16 port FS EF 8 port P2 X5 8 port SW PR 20 Attorneys X4 SW P1 PR 10 Legal Sec. 8 port X2 P2 X5
- 32. Design 3: 4thFloor R 5th Floor SW P2 PR 6 Clerical SW P2 PR 10 Legal Sec. 8 port 16 port 8 port X2 X6 X5 P2 PR Mgr. X2 FO FOFO
- 33. Design 3: 5thFloor R 4th Floor DSL SW SW 16 port EFFS 8 port LC X5 8 port SW PR 20 Attorneys X4 SW P2 10 Legal Sec.8 port X2 P2 PR X5 AP FO FO FO
- 34. Decision time! Whichone will work? Which one works best? Which is best value for money? Therefore, which one would you recommend?
- 35.
- 36. Costs Can beradically different depending on the actual devices to be used (hubs, switches, etc., etc.)
- 37. Summary For amedium-sized company LAN: Extra issues in the size of the network and the fact that it is split across two floors Will need a backbone connecting the floors, and a secure room to house the server “farm” Most traffic will be concentrated on the Legal Secretaries