CMIT 265 Network Design Paper
CMIT 265 Network Design Paper PRG211
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Date Created: 11/09/15
The University has recently leased a building in Adelphi, Maryland. The building will house some offices, classrooms, library, and computer labs. Building dimensions: Length: 240 Feet, Width: 95 Feet, Height: 30 Feet The 50yearold twostory building has the following layout: There will be six computer labs that will be used for instruction. Each of these labs will have 22 computers (20 student computers and 1 instructor computer). Each of these labs will also have a server in the closet located inside the lab. In addition to the six computer labs, there will also be a Student Computer Lab that will provide computer access to students to do their homework. There will be 30 computers in this lab and a server in the closet. The library will also have some computers to allow students access to the library resources. There will be 10 computers for student’s use in the library, and 5 computers for Library staff. There are five lecture classrooms in the b Network Design With the acquisition of a two storey building in Adelphi, Maryland it provides the significant opportunity for a new network topology to be devised and implemented so that there is consistent connectivity across each of the rooms as well as an overall security concept devised around the segregation of data. As this is one of the most crucial requirements to ensure that the student and staff computers and networks are separated then there will need to be different subnets created for each of these purposes, while also allowing for students to connect wirelessly through the wireless access point which has been proposed for their lobby area. There is an opportunity to implement an infrastructure from scratch which will allow for the best possible cabling installation to be performed within the location. As all connectivity, with the exception of the student lobby, is to be performed using fixed cables and physical connections then it would be recommended that Cat6A cabling is defined as the Ethernet standard. This is due to the limitations apparent with Cat6 cabling as to the maximum cable length that can be used to deliver network connections without transmission issues. Cat6A will allow for over 300ft of cabling to be used without incurring any issues. Through the provision of a server room on each floor it will be possible to appropriately manage the connectivity that is needed for each of the specific locations. Each room will require a certain number of data ports which are linked to a patch panel located in the server room and this number of ports can be calculated through an analysis of the specific room requirements as below: Room Staff Connections Student Connections Total Data Points st Floor Location Staff Connections Student Connections Total Lecture Classroom 1 1 1 Lecture Classroom 2 1 1 Office 1 1 1 Lecture Classroom 3 1 1 Lecture Classroom 5 1 1 Office 3 (IT) 1 1 Lecture Classroom 4 1 1 Library 5 10 15 Office 4 (Dean) 1 1 Office 5 (Admission) 5 5 Total 28 As outlined, this provides a total requirement of 28 network connections before other peripheral devices such as printers are considered. With the advised requirement of the Library requiring 2 printers, and each Office requiring a printer connection this would provide a total of 34 required data connections. However, to facilitate the sharing of data and information, as well as providing appropriate infrastructure services for the printing services there will need to be a server made available to both networks. This will therefore require a dedicated connection within the server room itself so there should be an allowance for a minimum of 35 such connections accordingly. nd A similar process can be applied for the 2 Floor locations and specific network requirements: Staff Connections Student Connections Total Data Points nd 2 Floor Location Staff Connections Student Connections Total Computer Lab 1 1 22 23 Computer Lab 2 1 22 23 Office 1 1 1 Computer Lab 3 1 22 23 Computer Lab 4 1 22 23 Office 2 (HR) 1 1 Computer Lab 5 1 22 23 Student Computer Lab 31 31 Office 3 (Faculty) 1 1 Computer Lab 6 1 22 23 Total 172 As well as these overall considerations there would also be a Wireless Access Point within the student lobby area – one of the fundamental network requirements, in addition to the provision of a printer within each Lab as well as each Office. Therefore there needs to be at least 183 network connections available from the patch panels in the 2 Floor server room. Having determined the number of connections that are required to serve each location and floor within the new structure, it will also be necessary to devise an appropriate IP addressing scheme which will allow for the necessary connectivity to be provided while also ensuring that there is the requisite segregation for the staff and student machines and networks. There has already been the provision of a Class A network address to facilitate this implementation, and the 184.108.40.206/16 implementation will provide a range of available subnets which can be used as well as allowing for suitable expandability in the future as requirements change: Network Hosts Subnet Mask From To Staff 220.127.116.11 18.104.22.168 255.255.0.0 Staff Testing 22.214.171.124 126.96.36.199 255.255.0.0 Student 188.8.131.52 184.108.40.206 255.255.0.0 Student Testing 220.127.116.11 18.104.22.168 255.255.0.0 It would be recommended that not only are Staff and Student networks separated through different subnets but there should also be the creation of testing networks so that the lab environments can be selfsufficient and not operate on the main data networks for either group. All of these networks will receive Internet access through a designated router provided by Verizon for the 22.214.171.124 IP address and service. The network design which is proposed is based around a Tree design along with a Star and Bus topology in order to provide the required connections for each physical location and port. Having calculated the number of data connections required on each st floor, it is apparent that a 48 port switch should be provided for the 1 floor connections, while 4 of the same switches would be required on the 2 floor. Not only will this deliver the required number of connections but it will also allow for expansion if required without needing to add additional switches until a later date. In the event that the network utilization and number of systems does expand significantly then the addition of further switches as required would not be an overly complex process. The implementation of this configuration will therefore allow for all the requirements to be met at each of the locations on each floor. It will be possible for both the staff and student groups to work effectively from any of the locations through the consistent application of network infrastructure and design methodologies. In addition to the separate network infrastructure there would also be the need to ensure physical security through appropriate cabling connections. Patch panels will need to be appropriately labelled and there will also be separate user accounts and shared folders created on the outlined file/print server installation in order for convenient access to saved information. To fully benefit from appropriate user based security it would be recommended that specific domains are created for both staff and students as this would also allow the highest levels of control over the actions which are undertaken and performed by each type of user. Network security must also be maintained, especially with the availability of public Internet connectivity across all systems. It would be recommended that mandatory security policies are drawn up so that all connected systems are appropriately firewalled and utilize AntiVirus accordingly before being permitted to connect to the network. The hardware firewall present within the Verizon router should also be configured to block all unnecessary ports by default as a security measure in order to guard against network intrusions and attacks through known vulnerabilities. These would include ports such as TCP/UDP 135139, and TCP/UDP 445 – all of which could provide a source of intrusion but would not be required externally at all and can therefore safely be disabled. Wireless security should also be applied to the connection available within the student lobby area. As this is likely to be an open network for convenience then it should only permit traffic to Internet locations, and not allow any connection to internal resources with the emphasis being on using it for research while the majority of work would be carried out using the Lab or Library machines. The proposal outlined meets the necessary requirements outlined and also provides suitable scope for expansion should the need be presented at any time. The overall requirements of the network can be defined through the below technical breakdown: Physical Requirement Proposal Justification Network Topology Combination of Star & Multiple star topologies Bus/Tree Topology are integrated onto a bus. Single switches infrastructures provide connectivity for each floor Network Media Ethernet Cat6A Length of building requires interference free cabling Network Connecting Verizon provided router Majority of connectivity nd Devices Firewall requirements in 2 Floor locations 4 x 48 Switches (2 Floor) 1 x 48 Switch (1 Floor) Wireless Access Point Physical Layout Straightforward – separate Efficient and effective subnets for student and staff, manner in which controlled by patched physical connectivity can connections with secured be controlled data centers on each floor Additional File & Print Server Secure and audited Servers/Network Devices access to files and Domain Controller (potential) printers. Authorization and authentication services could be provided by a designated Domain. References Campus Network for High Availability Design Guide. (n.d.). Retrieved from Design Zone for Campus: http://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/HA_campus_DG/hacam pusdg.html Kurose, J. F., & Ross, K. W. (2008). Computer Networking: A TopDown Approach. Addison Wesley. McCabe, J. D. (2007). Network Analysis, Architecture, and Design. Morgan Kaufmann. Mitchell, B. (2014). Introduction to Network Types. Retrieved from About.com: http://compnetworking.about.com/od/basicnetworkingconcepts/a/network_types.htm Oppenheimer, P. (2012). TopDown Network Design. Cisco. Peterson, L. L., & Davie, B. S. (2011). Computer Networks, Fifth Edition: A Systems Approach (The Morgan Kaufmann Series in Networking). Morgan Kaufmann.
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