There are several levels of possible wireless protection ranging from the limited RF signal spread to RADIUS-based authentication and VPN deployment. However, there is a counter-countermeasure for practically every countermeasure available to WLAN defenders. This is similar to developing missiles, antimissiles, and fake targets and jammers to deflect the antimissiles in military practice. A skilled penetration tester has to be familiar with the means of getting through various wireless defense mechanisms and must be able to implement these methods when needed. Wireless penetration testing is not limited to finding networks and cracking WEP, and as the sophistication of wireless defenses grows, so does the complexity of attacks aimed at bypassing them.