Network concentrators provide a central location for workstation and server cables, enabling multiple PCs to be hooked up to a company's network simultaneously. Also referred to as computer concentrators, they are often referred to as hubs when they come with multiple slots for multi-port cards, thus accommodating a business network as it expands.

Concentrators come in a variety of sizes to support computer networks. They are ideal for networks laid out with star or star-wired ring topology. A concentrators provider will generally recommend they be installed in a metal rack. These racks are easy to purchase and are also used to store network modems, bridges, or routers. When gathering concentrators information to determine what type of hub suits your network needs, be sure to ask yourself the following questions:

1. How many ports will your concentrator require to accommodate your business as it grows?

2. Could you benefit from purchasing specialized software to assist with port management?

3. Would your business benefit from purchasing concentrators to defend your network from attack?

Action Steps
The best contacts and resources to help you get it done

Find concentrators that have the correct number of ports to accommodate your network as it expands

Concentrators or hubs generally come in 8-, 12-, or 24-port configurations. Some manufacturers, however, also carry concentrators with larger or smaller configurations. Remember to project network growth when making your purchase by not just considering how many workstations your concentrator will need to accommodate now, but how many it may need down the road as your business grows.

I recommend: PacificGeek sells 12-port concentrators manufactured by Synoptic Communications. EZ Systems has a large selection of hubs with anywhere from five to 14 ports.

Purchase specialized software to help concentrators manage ports

Consider adding specialized software as a 'must-have' on your concentrators list. Many manufacturers sell software that filters content, allowing businesses to easily create and enforce Internet access policies.

I recommend: Limited Goods sells the Zywal Prof VPN Concentrator, which ensures updates are automatically downloaded and installed. AdventNet's website sells OpManager network management software that can help manage your hub's ports. .

Defend your network from attack with concentrators

Concentrators have been put to good use on networks of all sizes to serve as an additional defense against the same threats that firewalls and intrusion protection software are designed to mitigate.

I recommend: Cisco VPN 3000 Series Concentrators were replaced in 2007 by the Cisco ASA 5500 Series that claims to "provide intelligent threat defense and secure communications services that stop attacks before they impact business continuity." NetWitness sells a concentrator designed to collect information on your network to assist with security-related reporting, alerting and analysis.

Tips & Tactics

Helpful advice for making the most of this Guide

• •  Save money by purchasing refurbished computer concentrators for your business. Concentrator providers and resellers sell these at a discount with warranties included.