First of all, I would find out some of the requirements that the companies have registered within their workforce. Requirements such as what is the amount of users in each office, what type of servers does each office has installed, what is the budget for each office to see how much is expendable for this business network, what is the growth expectation for the future of the company, what level of security do each company want to install within each server, and those are just the basic requirements, that one has to know in order to install this big, type of network.

My first option would be to use AT&T's MPLS. MPLS stands for Multi-protocol label switching and it is use to enhance the performance of the IP network. This allows the network to provide a more efficient way to manage applications and send and transfer information from one place to another. This option also provides each office with a VPN security connection. VPN stands for Virtual Private Networking; this type of connection uses the internet's infrastructure to send and transfers information from one place to another, making this type of connection very safe, secure, and reliable. Also by using this option one can have the option of using WAN , Wide Area Network, which is use to work in a long distance network, instead of using a LAN service , which is only good for local networks like a small office.

The second option would be to use a dedicated internet connection to each office. For example, I would use the business class DSL, with the highest amount of upload that this service can provide, for accessing and transferring information. This will also allow each office to run their service by using T1 lines. T1 lines allow the receiving and transferring of all sorts of applications and information, in a big amount, that normal, data transmission lines could not withhold and handle. The next thing to do is to buy watch guard firewalls products for each office to provide the upmost security for each user, office, and server. Those are the two options I offer, the first option is more expensive but more reliable, but the second option is cheaper, but limited. At the end of the day, both of these options work well, to set up a network in a company that have offices in 5 different states.