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Windows Networking Design Implementation

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The present IT infrastructure of B2B Company will be investigated. The exisiting threats of the present network will be studied. The secured network design with necessary IP addressing , hard ware and software requirements will be studied. The network devices that are needed to implement the secured network design will be explained briefly. Network diagrams and IP addressing designs will be made.

Network Design Project Scope

The network planning[1] by keeping security as one of the important parameters.B2B company has six departments and the requirement is a router across each department and hence the network is designed with 6 routers and these six router share 500 workstations. Finance department has 100 workstations. Transport office has 50 workstations. Research office has 25 workstations. Sales office has 25 workstations. Information technology has 250 workstations. The head office has 50 workstations. Security devices are provided in layers to implement the safe handling of the network. As a network security architect, the criteria to be implemented are taken into consideration. The network is designed in such a manner that it has proper flow of information [2]. To implement the confidentiality, the network is protected or crypted with passwords. Web based filtering is also implemented by using proper certified website through a web filter and also by blocking the insecure sites. Role based access control is also implemented in the network. RBAC is used to aid the users perform specific tasks according to the departments. The network also has IPS, firewall and webservers[3].

Security Threats

  A security threat[5] is nothing but a risk that can create harm or damage the network's working environment. The threat mostly comes in the form of a software threat. There are many threats that can affect the network. Some of the security threats are

  • Ransom ware
  • Software vulnerabilities
  • Hacktivism
  • Online hacking
  • Cloud attacks

The threats may also come in the form of virus, Trojans. DoS attack is nothing but the denial of service attack that is used to create data traffic artificially and can make a server drown very easily. The threats can also be categorized into physical and non-physical threats. The physical threats are nothing but the threats that cause damage to the devices. The types of physical threats are internal, external and humans. Nonphysical threat is the one that creates loss of data or information. The nonphysical threats are also called the logical threats. The logical threats are more dangerous.

Secure Network Design

Security is considered as a major factor in designing the network. More layers of security are provided. The first layer of security is provided by the VPN[7][8]. The second layer of security is provided by the firewall. The third layer of security is provided by IPS. VPN diagram is shown below.

Since different sites are used the end users may need to send the data through WAN. VPN will give lot of security features in this type of IT network infrastructure.

Detailed diagram of the LAN network is shown.

The IP addressing scan be as per the requirement.

  • Finance Office got 100 workstations. In DHCP server this can be Scope_Finance and the allowed IP ranges can be
  • Transport Office got 50 workstations. In DHCP server this can be Scope_Transport and the allowed IP ranges can be 168.1.121-
  • Research Office got 25 workstations. In DHCP server this can be Scope_Research and the allowed IP ranges can be 168.1.181-
  • Sales Office got 25 workstations. In DHCP server this can be Scope_Sales and the allowed IP ranges can be  168.2.1 -
  • Information technology got 250 workstations. In DHCP server this can be Scope_IT and the allowed IP ranges can be 168.3.1-
  • Head Office got 50 workstations. In DHCP server this can be Scope_Headoffice and the allowed IP ranges can be 168.4.1-

The security blocks used in the network include

  • Firewall
  • Antivirus server
  • IPS system

Three layers of security are implemented in the network diagram. First layer of security is implemented by the firewall. Second layer of security is implemented by the anti-virus servers. The third level of security is implemented by the IPS system. Firewall is installed between the router and the server. In order to provide the security to the servers, antivirus server is also implemented. PS is the abbreviation of Intrusion Prevention System. It protects against the threats by examining the network traffic.

Hardware requirements and devices

Required hardware [6] to implement the secured network is explained below.

A router is a one that establishes connection between two or more wired or wireless devices that frames a structured network. Router has memory and operates like a embedded device. Router is also responsible for handling incoming and outgoing packets. Packets are basic unit of the network. There are many types of router like Brouter, Core router, Edge router, Virtual router, Wireless router.

  • Manufacturer’s Name-- Cisco
  • Series Series-- Integrated Services Routers
  • Model-- 4000

Switches are used to connect devices. Router also serves the same functionality but the difference is that routers are used to connect the network and the witches are used to create the network. There are two main types of switches. They are manageable switches and non-manageable switches. Switches are considered as valuable assets for a network. Switch have many ports. According to the port, the switch can be 2 port switch, 4 port switch or the multiple port switch. Switch allows the flow of the network in a structured manner.

  • Manufacturer’s Name Cisco
  • Series Catalyst Switch
  • Model 6880-X

Network cables are used to connect one device to the other device physically.There are many types of cables used in network.They are

  • Twisted pair
  • Fiber optic
  • Coaxial
  • Patch
  • Power lines

Twisted pair cable is one which has pairs of wires in twisted form.Fibre optic cable is one which has glass core in the center that is surrounded by many protective materials.The protective layer is nothing but the layer of insulating jacket. Patch cable is one which is mostly used for connecting electrical devices

  • Manufacturer’s Name Hitech Products Private Limited (falcon Cables)
  • Series Networking cable
  • Model CAT-5

Like a wall which gives security to the buildings, firewall also refers to the system which provides security to the networks. Firewall blocks the authorized access. Firewall can be a software application or a hard ware device.

Web Server

A webserver is one that aids one to browse or handle webpages. The webserver works with the help of HHTP.HTTP is a type of protocol. They share the viewing and editing control of webpages upon request

Software Requirements

Windows servers need Windows 2012 R2 Operating system[10]. Web server can be implemented in Apache/IIS. Routers and switche3s will be having inbuilt OS.


CIAA stands for confidentiality, integrity, availability and authentication[8].  In the present network VPN is configured.  So the data confidentiality is ensured. Integrity can be checked by using many techniques like parities. Availability can be implements for keeping the data in multiple palces. Authentication can be achieved by using active directory in this design


The security implementation to the various blocks used in the network diagram is clearly explained. The misconfiguration of webserver by an attacker is prevented by using the antivirus server. The antivirus server protects the application server from vulnerable software. Suppose a malicious document gets opened by an employee, it can be considered as a threat. The threat can be avoided by taking care of the network traffic using the IPS system. DNS server is also kept away from the cache poisoning using the IPS system.



[1]"Network design checklist: How to design a LAN", SearchITChannel, 2017. [Online]. Available: [Accessed: 29- Sep- 2017].

[2]I. Cisco Systems, "Introduction to Cisco Network Design > Designing Campus Networks",, 2017. [Online]. Available: [Accessed: 29- Sep- 2017].

[3]"Campus Network Design Models", Network Computing, 2017. [Online]. Available: [Accessed: 29- Sep- 2017].

[4]P. Oppenheimer, Top-down network design. Indianapolis, Ind.: Cisco Press, 2011.

[5]"Security Threats",, 2017. [Online]. Available: [Accessed: 29- Sep- 2017].

[6]"Network Devices", 2017. [Online]. Available: [Accessed: 29- Sep- 2017].

[7]"How VPN Works: Virtual Private Network (VPN)",, 2017. [Online]. Available: [Accessed: 29- Sep- 2017].

[8]"Information Security Concepts +1: Confidentiality, Integrity, Availablity, and Authenticity", Bright Hub, 2017. [Online]. Available: [Accessed: 29- Sep- 2017].

[9]V. Ltd., "Network solutions, network monitoring, network filrewall systems, network security - VirtueWorld - Website Design and Development",, 2017. [Online]. Available: [Accessed: 29- Sep- 2017].

[10]"Windows Networking Design Implementation Guide", Cisco, 2017. [Online]. Available: [Accessed: 29- Sep- 2017].


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