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Accounting & Financial Services Corporation
Accounting & Financial Services Network Design
By Michael J. SmithNov. 14, 2011
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Network Objectives• Security. Prevent unauthorized access.
• Speed. Bandwidth must meet demand.
• Reliability. Contain redundancy.
• Scalability. Sustain scalability without the need to rebuild entire network.
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Design Assumptions
• AFS does not have a network.
• Departments reside on a separate floors.
• AFS does not share buildings with any other businesses.
• AFS wants to use MS Windows & Office.
• 100Base-TX for LANs and 1000Base-FX for the WAN will suffice.
• The network design must only ensure that it is logically secure.
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Network Needs
• Accommodate file sharing, including text files, graphic-heavy files, and database information.
• Accommodate 1,600 users across seven locations.
• Accommodate web-based applications.
• Prevent authorized access.
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AFS Network Design
• One wide-area-network connecting all the offices to AFS headquarters using a star architecture.
• A backbone network that will connect all the LANs in each branch office to the WAN.
• Several department local-area-networks that will connect workstations in departments together.
• AFS Network will not be meshed to save money.
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AFS Wide-Area-Network• Each location has a router.
• Each location is connected to AFS HQ using 1GbE over fiber cables. (1000Base-FX).
• Each location has a media converter.
• All Internet traffic is routed to AFS HQ to limit entry points.
• The Dublin office contains redundancy, should the connection to AFS HQ experience problems.
• Both AFS HQ and Dublin have firewalls and anomaly detection systems.
• Each location has a L3 switch.
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AFS WAN Diagram
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AFS Branch Office BN Diagram
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AFS Backbone Network
• 100Base-TX over Cat 5e will be used in the AFS BN.
• Each AFS location needs one L2 switch for each department LAN and one for the DMZ.
• Each location needs one L3 switch to connect core layer to distribution layer.
• The BN will not contain any security beyond the DMZ, as security will be handled by the anomaly detector and firewall at HQ.
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AFS HQ BN Diagram
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AFS HQ MDF Diagram
• HQ will contain a firewall and anomaly detector.
• HQ will have a web server in its DMZ.
• HQ has two more departments than branch offices.
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AFS HQ MDF Diagram
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AFS HQ Local-Area-Network
• 100Base-TX over Cat 5 will be used.
• Department LANs will be dedicated server networks with a star topology.
• Multipoint circuits will be employed.
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AFS HQ LAN Diagrams
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AFS HQ LAN Diagrams
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AFS HQ LAN Diagrams
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Branch Office MDF
• The Dublin office will contain network redundancy.
• Each MDF will contain one L3 switch and six L2 switches.
• Branch Office department LANs will have DMZs that contain email server.
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AFS Dublin MDF Diagram
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Branch Office LANs
• Each department has its own database, file, and print server.
• Department LANs will require a patch panel and an L2 switch.
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Dublin Office LAN Diagrams
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Dublin Office LAN Diagrams
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Dublin Office LAN Diagram
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Location IP AddressesLOCATION IP ADDRESS
Fairfax, VA (HQ) 150.15.16.0/20
Dublin, OH 150.15.32.0/20
Greensboro, NC 150.15.48.0/20
Denver, CO 150.15.64.0/20
Burbank, CA 150.15.80.0/20
Seattle, WA 150.15.96.0/20
Omaha, NE 150.15.112.0/20
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IP Addressing
• IP addresses were assigned consistently across branch offices.– Should allow technicians to identify servers by
IP address.• For example: A server with IP 150.15.84.10 is
located in Burbank, CA.– The “8” in “84” tells us it is in Burbank because it falls in
the range 150.15.80.1 – 150.15.95.254.– The “4” in “84” tells us that the server belongs to the
Customer Service department because it falls in the range 150.15.84.1 – 150.15.84.254.
– The “10” tells us that it is a file server because all branch office file servers end in 10.
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IP Addresses Cont’d.Location IP AddressesFairfax HQ
Executive Dept.IT DepartmentAcct. & Fin Dept.HR DepartmentSales & Mktg. Dept.Cust. Svc. Dept.Legal Department
150.15.16.0/20150.15.16.0/24150.15.17.0/24150.15.18.0/24150.15.19.0/24150.15.20.0/24150.15.21.0/24150.15.2820/24
DublinAccounting Dept.Finance Dept.HR DepartmentSales & Mktg. Dept.Cust. Svc. Dept.
150.15.32.0/20150.15.32.0/24150.15.33.0/24150.15.34.0/24150.15.35.0/24150.15.36.0/24
GreensboroAccounting Dept.Finance Dept.HR DepartmentSales & Mktg. Dept.Cust. Svc. Dept.
150.15.48.0/20150.15.48.0/24150.15.49.0/24150.15.50.0/24150.15.51.0/24150.15.52.0/24
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Location IP AddressesDenver
Accounting Dept.Finance Dept.HR DepartmentSales & Mktg. Dept.Cust. Svc. Dept.
150.15.64.0/20150.15.64.0/24150.15.65.0/24150.15.66.0/24150.15.67.0/24150.15.68.0/24
BurbankAccounting Dept.Finance Dept.HR DepartmentSales & Mktg. Dept.Cust. Svc. Dept.
150.15.80.0/20150.15.80.0/24150.15.81.0/24150.15.82.0/24150.15.83.0/24150.15.84.0/24
SeattleAccounting Dept.Finance Dept.HR DepartmentSales & Mktg. Dept.Cust. Svc. Dept.
150.15.96.0/20150.15.96.0/24150.15.97.0/24150.15.98.0/24150.15.99.0/24150.15.100.0/24
OmahaAccounting Dept.Finance Dept.HR DepartmentSales & Mktg. Dept.Cust. Svc. Dept.
150.15.112.0/20150.15.112.0/24150.15.113.0/24150.15.114.0/24150.15.115.0/24150.15.116.0/24
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AFS Network Cost
Total Network Cost for Configuration #1: $14,173,439.48
Total Network Cost for Configuration #2:$15, 370,624.86