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Building a Corporate Network – A Case Study

Building a Corporate Network – A Case Study. Objectives. At the end of this case study you will be able to Transfer a business communication requirements into a data network requirement Describe the primary components that constitutes a data network

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Building a Corporate Network – A Case Study

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  1. Building a Corporate Network – A Case Study

  2. Objectives • At the end of this case study you will be able to • Transfer a business communication requirements into a data network requirement • Describe the primary components that constitutes a data network • Identify the basic elements of LAN, WAN and Security sub systems • Prescribe a high level network structure for a generic corporate data network

  3. Acme Corporation • Acme Corporation is a multinational organization who has two of their manufacturing plants in Sri Lanka. They produce automobile tires for export and local market. The main factory and head office is located at Kelaniya and another factory at BOI zone, Katunayake. They have a warehouse at Peliyagoda and a raw material store at Thalawakale. Acme Corp need to build a data network to deploy their new ERP (Enterprise Resource Planning) application. The Katunayake factory and Peliyagoda warehouse are to be connected online to the head office and the raw material store is to be connected for batch processing via a dial up facility. In addition they need to have Internet connectivity, a local web site and E-mail service for their staff. Staff from corporate head quarters (abroad) and telecommuters in Sri Lanka need to gain access to Acme Corp network for various activities. Data and network security are concerns of the network administrator.

  4. Acme Corporation (Cont’d) Raw Material Stores (Thalawakale) Branch Factory (BOI Zone - Katunayake) Warehouse (Peliyagoda) Internet Head Office / Main Factory (Kelaniya) Telecommuters Mobile Users

  5. Network Elements • User and server local connectivity at head office, branch, warehouse and store • Network switches and devices • Cabling infrastructure (copper/fiber) • Wide area interconnectivity • Routers • Links from a network service provider • Internet connectivity • Router • Internet connection from as Internet Service Provider (ISP) • Security • Firewall • Virtual Private Network (VPN) device • Telecommuting • Remote access server • Modems • Telephone lines • Wireless connectivity at head office • Wireless access point • Network address planning

  6. Branch Factory 10/100 Base-TX Warehouse Stores 10/100 Base-TX 10/100 Base-TX Branch LAN • Branch, Warehouse & Stores LAN Devices • 10/100 Base-TX Autosense Ethernet Switch - 03 nos. • Copper (UTP) Cable plant at all 03 locations

  7. Wireless Access Point NetworkPrinter ERP Server and other shared Resources MobileUsers 10/100 Base-TX Optical Fibre Uplinks 100 Base-FX 10/100 Base-TX 10/100 Base-TX Head Office LAN Floor 3 Floor 2 Floor 1

  8. Head Office LAN (cont’d) • Head Office LAN Components • 10/100 Base-TX Autosense Ethernet Switch – 03 nos. • Optical fiber transceivers – 4 nos. • Wireless Access Point – 1 no. • Copper (UTP) / Fiber Cable plant

  9. DSU/CSU Modem Leased Line DSU/CSU DSU/CSU Router DSU/CSU Modem PSTN Ethernet Modem Modem Router Modem Ethernet Wide Area Network Branch Factory Router Head Office Ethernet Router Warehouse Ethernet Stores

  10. Wide Area Network (cont’d) • WAN Components • Routers – 4 nos. • DSU/CSUs – 4 nos. • (Digital Service Units/Channel Service Units) • Modems (synchronous) – 5 nos. • Leased Lines – 2 nos. • Head Office ↔ Branch Factory • Head Office ↔ Warehouse • PSTN Links (Telephone lines) – 5 nos. • Head Office – 2 nos. • Branch Factory – 1 no. • Warehouse – 1 no. • Stores - 1 no.

  11. WAN Connectivity Options • Leased Links / Clear Channel Circuits • Dead copper loops • Active copper loops • Microwave point-to-point links • Microwave point-to-multi point access system • PDH/SDH* transmission networks • Satellite links • Dark fiber loop • Free space optics (laser) • Public Switched Data Networks • Frame Relay • ATM • Public IP Backbone • Multi Protocol Label Switching (MPLS) IP backbone • VPN over Internet • Packet over SONET/SDH PDH – Pleisiochronous Digital Hierarchy SDH – Synchronous Digital Hierarchy

  12. WAN Data rates • Link speeds • DS0 - 64 kbps • 128 / 256 / 512 / 1024 kbps • E1 – 2 Mbps • E3 – 34 Mbps • OC-3c / STM-1 – 155 Mbps • OC-12 / STM-4 – 622 Mbps • OC-48 / STM-16 – 2.488 Gbps • Gigabit Ethernet – 1,000 Mbps • 10 Gigabit Ethernet - 10 Gbps • Fiber Channel – 2 Gbps Uses OSI Layer 2 FramingProtocols

  13. Dial-up Services • Dial Backup • to recover from failed links • Dial on Demand • to provide on demand access and disconnect while idling • Bandwidth on Demand • to provide increased bandwidth during congestion • Options • PSTN – Public Switched Telephone Network • ISDN – Integrated Service Digital Network

  14. Unprotected Network De-militarized Zone Secure Network Web Server and Mail Server VPN Gateway Firewall To Router Downlinks to 2nd and 1st Floors Internet Connectivity Internet ISP ERP Server and other shared Resources DSU/CSU Router 10/100 Base-TX

  15. Incoming Web, Mail VPN connections Web, Mail server connections Outgoing Mail Corporate users’ Internet Access To Router Downlinks to 2nd and 1st Floors No access Firewall Security Policy Web Server and Mail Server Internet VPN Gateway ISP ERP Server and other shared Resources DSU/CSU Router Firewall

  16. Secure Access to ERP Server Client at Headquarters • Encrypted • Authenticated • Authorized • Accounted • …. access only. Internet Web Server and Mail Server VPN Gateway ISP ERP Server and other shared Resources DSU/CSU Router Firewall To Router Downlinks to 2nd and 1st Floors

  17. Internet and Security • Internet connectivity • Router – 1 no. • DSU/CSU – 1 no. • ISP connection – 1 no. • Security • Firewall – 1 no. • VPN Gateway device – 1 no.

  18. Remote Access Server Home User PSTN Modem Pool Notebook Computer Ethernet (DMZ) Remote Access Service • RAS Components • Remote Access Server – 1 no. • Modems (Asynchronous) – 4 nos. • PSTN (telephone) lines – 4 nos.

  19. DSU/CSU Leased Line Router DSU/CSU PSTN Modem Modem Internet ISP Web Server and Mail Server Modem Pool VPN Gateway Remote Access Server Wireless Access Point DSU/CSU Mobile Users Router Firewall Complete Head Office Network ERP Server and other shared Resources

  20. Bill of Material

  21. Summary • Business requirement • Network requirement • Local area network • Wide area network • Internet connectivity • Firewall and VPN

  22. Thank you

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