Ethernet (wired)

Advantages Very secure; no special security measures necessary. Most reliable; usually immune to interference. Fastest data transfer--up to 94 megabits per second for the common 10/100 type, enough for virtually any data application.
Disadvantages Doesn't allow you to easily move your computer around the home. Routing cables throughout the home can be a hassle or expensive.
Cost $100 or less for one router and a cable to connect two fairly new computers. Also, possible costs for routing cable through the home.
Best choice for desktops near an Internet connection or computers swapping large files, including video.

Wi-Fi, 802.11g
(wireless)

Advantages No cables to connect or rout. Minimal installation costs. Unrivaled mobility--supplies signals virtually anywhere around the home.
Disadvantages Security requires additional steps, without which your data are vulnerable to hackers. Thick walls can reduce signal strength, which might vary in different areas of the home or even within a room. Wi-Fi networks might interfere with cordless phones, baby monitors, and other wireless devices. Only 25 percent as fast as Ethernet, but still fine for typical networking uses, such as Web surfing and e-mail.
Cost $200 or less for a router and client cards to allow two computers to use the network wirelessly.
Best choice for the mobility and versatility demanded by laptop users. Also a good choice for desktops at opposite ends of the home.

Illustrations by Neil Leslie