Network testing or WiFi cracking is used to evaluate network security, while attempting to crack into a network. With this process the system can be analyzed for security vulnerabilities and other technological shortcomings or improper system configuration. The network penetration cards that you purchase must be of good quality for the cracking process may as well be hampered with too slow an adaptor or one that has a slow range. For network penetration purpose the card must be able to perform two vital functions, including the ability to enter monitoring mode as well as being able to perform packet injections. The three wireless cards listed below are one of the most reliable and fast in terms of performance for the aforementioned purpose. 

1.Linksys WUSB54GC Compact Wireless-G USB Adapter

It is an easy to carry wireless G USB adaptor, which can just be simply plugged into your computer. It can easily enter monitoring mode, a vital requirement from network penetration, and then is able to capture packets. For testing purposes, it is also able to perform packet injections. It comes with a strong WPA encryption and hence it helps keep your network information and communication private. While it is a considerably cheap and useful adaptor it also tends to come with some setbacks compared to others. On the negative side it is an older model without any dual band features. Compared to other adaptors it is also relatively slower.

2.ORiNOCO 8494 USB Client Adapter - USB - 300Mbps - IEEE 802.11n

The Orinoco adaptor, with one of the most stylish and necessary design for heavy use, also comes with an exceptionally good reception which extends as far as 500 meters. The adapter’s driver can be automatically installed on both Linux and windows, and no problem has been encountered in this regard by many users. Even for the Ubuntu system there are many Orinoco drivers available that help it to enter monitoring mode without any problem. To allow for packet injections, the adaptor CD helps install the relevant driver with total ease. It is also a dual band wireless adaptor. Given the benefits and comforts that this adaptor has to offer and because of the fact that it is a product of one of the best wi-fi chipset manufacturers, it is relatively expensive. For windows 7 it may as well need a diver installation unlike some other systems.

3.TP-Link TL-WN321G 54Mbps Wireless USB Adapter 

This adaptor allows you to install the PC notebook or PC in a most convenient location available easily.  It comes with an auto-sensing capability that allows a speedy transfer of packets, up to in fact 54 Mbps. This adaptor comes with the facility of allowing you a quick security set up that is started simply by entering the pin of the wireless router. The Usb adaptor can then be set in minutes using its set-up wizard. With its configuration utility, users can quickly connect to detected wireless network. Some other benefits of USB adaptor include a good customer support that is quick in responding, one of the best packet injection support and especially for Linux, it is able to enter monitoring mode on request. Few of the problems that have been experienced with this adaptor is the fact that it is not very much suitable for windows 7 while also lacking support for windows XP. Many newer and upgraded versions of these are now available in the market.