tailieunhanh - CompTIA Network+ Certification Study Guide part 24

CompTIA’s Network+ certification Study Guide part 24 is a globally-recognized, vendor neutral exam that has helped over 235,000 IT professionals reach further and higher in their careers. The 2009 Network+ exam (N10-004) is a major update with more focus on security and wireless aspects of networking. Our new study guide has been updated accordingly with focus on network, systems, and WAN security and complete coverage of today’s wireless networking standards. | 216 CHAPTER 5 Wireless Networking attacks. One possible example includes jamming the wireless network thereby forcing clients to lose their connections with authorized APs. During this time rogue APs can be made available operating at a higher power than the authorized APs. When the jamming attack is stopped the clients will tend to associate back to the AP that is presenting the strongest signal. Now the attacker owns all of the network clients attached to his rogue APs. The attack continues from there. In some cases you find that RF jamming is not always intentional and may be the result of other non-hostile sources such as a nearby communications tower or another wireless LAN that is also operating in the same frequency range. Baby monitors cordless telephones microwave ovens and many other consumer products may also be sources of possible interference. You can take some comfort in knowing that although a jamming attack is relatively easy and inexpensive to pull off it is not the preferred means of attack. The only real victory with a jamming attack for most hackers is temporarily taking your wireless network offline. CONFIGURING WINDOWS CLIENT COMPUTERS FOR WIRELESS NETWORK SECURITY Wireless LAN security is provided through a myriad of solutions. Some of these mechanisms are internal to Windows itself while others are third-party solutions or part of the IEEE standard. In this section we will be focusing primarily on using WEP WPA and security on Windows XP Professional computers and Windows Vista. Whatever security mechanism you should decide to implement you must ensure that you are diligent about getting it done right. There is rarely a second chance for security especially when it comes to securing a wireless LAN. Windows XP Professional Windows XP has been hailed as the OS of choice for wireless LAN users. Whatever your feelings are about this it is a fact that Windows XP brings excellent support for wireless networks and