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My company is moving to a larger building &nbsp;whereby we will be expanding our current IT infrastructure. I'm wondering on a network workflow type system to properly assess the needs for our new building. Currently we have about 20 pcs (winxp/win7pro) and a winxp pro system used for our server needs. Our email is hosted externally and so is our website. We do have a handful of seperate databases as well. I'm looking for direction as to order this assessment in a logical order and come up with a needed budget based on potential required needs. I'm looking at a 3rd party company to help support say a new server and networking equipment. 
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My company is moving to a larger building  whereby we will be expanding our current IT infrastructure. I'm wondering on a network workflow type system to properly assess the needs for our new building. Currently we have about 20 pcs (winxp/win7pro) and a winxp pro system used for our server needs. Our email is hosted externally and so is our website. We do have a handful of seperate databases as well. I'm looking for direction as to order this assessment in a logical order and come up with a needed budget based on potential required needs. I'm looking at a 3rd party company to help support say a new server and networking equipment. 

How do I assess the needs such as network infrastructure for new office building?

Network design and methodology, also known as network architecture, is the design of a communication network. It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as data formats used in its operation. In telecommunication, the specification of a network architecture may also include a detailed description of products and services delivered via a communications network, as well as detailed rate and billing structures under which services are compensated.

Network Architecture

Network analysis is the process of identifying and remediating the processes and systems within a network, including performance, connectivity and security. The process is performed through the use of tools developed for monitoring and analyzing network activity. Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flow, shortest path problem, transport problem, transshipment problem, location problem, matching problem, assignment problem, packing problem, routing problem, Critical Path Analysis and PERT (Program Evaluation & Review Technique).

Network Analysis

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.