The cost of any networking product is driven as much by the optional features as by the basic functions of the device. For example, you can get a 16-port workgroup-quality switch with no management or scalability features for around $170. On the flip side, a 12-port switch with management capabilities and the option to add Gigabit Ethernet connections can run as much as $680. Add on even more expansion and the cost of that same switch may soar to $1,850.

The least expensive Ethernet adapter you're likely to find costs about $15. If you want managed devices, so you'll have the ability to remotely query adapters about their health and activities, you'll pay about $59. Adapters that can encrypt data going across the network cost about $99. Wireless LAN adapters range from $100 to $140 depending on the brand.

The routers or gateways used in homes or small businesses to share a cable modem or DSL connection carry prices of $90 to $250 depending on the optional features you add--capabilities such as a virtual private networking, firewall protection, URL filtering, and wireless LAN connectivity. In contrast, a quality branch-office router, with good capacity, management features, flexibility, and scalability can cost over $2,000. Higher-capacity routers tend to cost tens of thousands of dollars.

In order to put all of this in perspective, let's take a look at sample budgets for three different types of networks. This will give you an approximation of what you'll need to spend today to get your network up and running. Find a great deals for networking here.

Sample network budgets