Wireless standards have stabilized substantially in recent years. The older 802.11a, 802.11b, 802.11g, and 802.11N standards are well accepted. While you still need to make sure that the hardware in your network will support whichever standard you decide to use, the odds are good that if you're OK with the speeds the standard provides, you're not going to have to worry about what will and won't work on your network.
802.11a – Up to 54Mb/s 75’-100’ Indoor range 5Ghz
Least used technology due to the cost when it was initially adopted. Now it’s cost is not much more than b or g. Since the 2.4 GHz band is heavily used to the point of being crowded, using the relatively unused 5 GHz band gives 802.11a a significant advantage. However, this high carrier frequency also brings a disadvantage: the effective overall range of 802.11a is less than that of 802.11b/g.
802.11b – Up to 11Mb/s 125’-150’Indoor Range 2.4Ghz
The dramatic increase in throughput of 802.11b (compared to the original standard) along with simultaneous substantial price reductions led to the rapid acceptance of 802.11b as the definitive wireless LAN technology.
802.11b devices suffer interference from other products operating in the 2.4 GHz band. Devices operating in the 2.4 GHz range include: microwave ovens, Bluetooth devices, and cordless telephones.
802.11g – Up to 54Mb/s 125’-150’ Indoor Range 2.4Ghz
This works in the 2.4 GHz band (like 802.11b), and was rapidly adopted by consumers when it was released in 2003. It shares the same bandwidth as the 802.11b standard, and also most standard wireless adapters support b/g. 80211.g still suffers like 802.11b in that even devices like wireless keyboards can affect its signal.
802.11n – Up to 300Mb/s 200’-230’ Indoor Range 2.4/5Ghz
802.11n is a recent amendment which improves upon the previous 802.11 standards by adding multiple-input multiple-output antennas (MIMO). 802.11n operates on both the 2.4GHz and the lesser used 5 GHz bands. It has the longest range and also the least interference of all of the standards.
A wireless network creates security problems that wired networks don't have to face. Potential attackers can sit outside of your building, point an antenna, and potentially access everything you've got. It's well known in security circles that some attempts at wireless security are virtually pointless—it's said that the Wired Equivalent Privacy (WEP) standard has been completely cracked and a determined attacker can get through WEP protection in under a minute.
An enterprise environment should definitely support the Wi-Fi Protected Access 2 (WPA2) encryption standard. You might have older wireless equipment that isn't compatible with WPA2, but the risk of leaving your network exposed isn't worth taking for old equipment. Keep the older, pre-WPA2 equipment in mind, however—if you have older laptops or expect on-site guests with them, you'll need to provide an alternative, like a wired network.
Encryption isn't the only defense for your wireless network. Most enterprise-class wireless routers support VPN tunnels, and other features such as integration with a security suite are common. Remember that you have to protect your network, but also remember that advanced security features often carry a performance cost, so carefully balance your networks.
Modern wireless routers can handle many simultaneous connections and lots of bandwidth, a major difference from less expensive SOHO routers. Plan ahead and know how much bandwidth and how many connections you'll need, though, because high-bandwidth applications and reliable connections are more vital as laptops and netbooks become more popular than desktops, even in enterprise settings.
An important consideration for wireless performance is range, but unfortunately your building, not your router, is probably going to be the biggest factor in range. It's probably not feasible to change your building's layout and construction materials for the sake of a wireless network, so plan to install repeaters for your wireless signal.
What Are Your Needs-
Wireless technology has advanced quickly in the last few years, so if you need a wireless network to perform certain task, chances are the equipment you need is available. The prices for wireless equipment vary by huge amounts, however, so take a thorough inventory of what you want to connect to your wireless network now and what you'll want to connect in the future.
What is your companies Network Security Policy? If you don't have one I suggest your perform Network Security Assessments and make sure that your putting the best effort you can into maintaing your data's safety.
Remember that you'll probably be connecting much more than laptops to your wireless network. Wi-Fi enabled smart phones are the norm now, and even devices such as media players and video game consoles have wireless access. There's no telling how people will want to use your wireless network in the next few years. SkyByte Consulting can assist with any of your companies network security projects from Cisco ASA firewalls, to Checkpoint support, VPN installations, and even performing network security assessments.