The Building Block Network Design

Published Date: 02 Nov 2017

Our goal is to understand why their network been built and what sort of users & applications they have been used.

To improve poor performance

To enable new applications

To apply more security to their system

Upgrade old equipment and gain more speed

Because of above problems they desire to upgrade their network system according their geographical scope. So we trying to analyze and decide what will be the best e commerce infrastructure for that company and plan according to their capacity.

We identified what will be our objectives will be.

To define the geographical scope of the system

To define application and users that will use the network

About Company Nature

When we analyzing their Head office at Colombo 07, we identified what sort of communication they are doing in day to day business.

Their Head office is a 4 storied building.

They have including 9 branches across the country

They have one LAN and one WAN.

They using Hubs for data transmitting through the Local Area Network.

Security is less according to their capacity of computers.

Routers are using for their Wide Area Network.

All other branches to gain information have to access the Head Office main server first.

They are using 4-pair Twisted Pair cabling.

They Have 5 Logistic Departments in their office

Account Department

Information Technology Department

Marketing Department

Human Resource Department

Financial Department

IT department can access all the computers of other Departments.

Other All Departments shouldn’t access to other departments without authorization of the manager of each department.

They are not using security types such as domain controller.

They have a lack security system which we identified and trying to propose a far better system than they had.

Network Design

They didn’t use a special technique to design their network. We decide to approach to the Building Block Network Design according to their needs which we done earlier.

Building Block Network Design

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At the above of this documentation we done the first stage of building block network design which is need analyzing and but some parts still we have to do.

As we know the first step in Needs Analyzing Break the network into three conceptual parts (based on their scope).

As we decide we trying to first break up their Local Area Network into Virtual Local Area Networks.

Virtual LANs (VLANs)

Virtual LANs (or VLANs) separate a Layer-2 switch into multiple broadcast domains. Each VLAN is its own individual broadcast domain (i.e. IP subnet). Individual ports or groups of ports can be assigned to a specific VLAN. Only ports belonging to the same VLAN can freely communicate; ports assigned to separate VLANs require a router to communicate. Broadcasts from one VLAN will never be sent out ports belonging to another VLAN. Please note: a Layer-2 switch that supports VLANs is not necessarily a Layer-3 switch. A Layer-3 switch, in addition to supporting VLANs, must also be capable of routing, and caching IP traffic flows. Layer-3 switches allow IP packets to be switched as opposed to routed, which reduces latency.

So we planned to set a VLAN to each department and then we can use a domain controller to restrict their access to other department’s computers. So Security part will be at the bottom of this documentation and we first stepped into decide what is the best e-commerce infrastructure to this company. So as we decide to propose 5 Virtual Local Area Network and combine them into one Local Area Network. Dedicated Servers can use for different purposes such as File Servers, Communication Servers, Print Servers by each department.

As we know Information Technology Department should be able to access all the computer in all department for many reasons.

To maintain Pc faults.

To maintain network characteristics etc.

So we proposed to combine all VLAN into 1 Local Area Network in the building. At the later stage in this documentation we can see what we proposed Devices, Security and Costing Assessments.

We concern about mainly what are the issues regarding to our design and we mainly looking into Bandwidth Vs Latency commonly say slow network.

We try to propose a network which gives "FASTER" internet connection that’s our main responsible. In this organization there are 10 branches so Wide Area Network Should be there. We think about a business that has a head office with a share point server and a branch office where users use that Head office’s server over the designed Wide Area Network. So our main concern is if enough users call into the helpdesk to complain about slow connection what do we do?, Then company and other people should be able to buy a bigger WAN link which is wrong thing to do which is what’s really going on.