31 Days Before Your CCNA Exam

264 31 Days Before Your CCNA ExamStep 7Verify the secure WLAN.Now that security is enabled, verify that the WLAN works again in the presence of thesecurity features by testing to make sure the wireless client can still access all theresources it could access without the security enabled.Wireless TroubleshootingIf you follow the recommended steps for implementing a wireless network, the divide-and-conquertroubleshooting methodology will most likely isolate the problem in the most efficient manner.The following are the most common causes of configuration problems:■Configuring a defined SSID on the client that does not match the access point■ Configuring incompatible security methodsBoth the wireless client and access point must match for authentication method, ExtensibleAuthentication Protocol (EAP) or PSK, and encryption method (Temporal Key Integrity Protocol[TKIP] or Advanced Encryption Standard [AES]). Other common problems resulting from initialRF installation can sometimes be identified by answering the following questions:■ Is the radio enabled on both the access point and client for the correct RF (2.4 GHz ISM or 5GHz UNII)?■■■■Is an external antenna connected and facing the correct direction (straight upward for dipole)?Is the antenna location too high or too low relative to wireless clients (within 20 vertical feet)?Are there metal objects in the room reflecting RF and causing poor performance?Is the AP the client is attempting to reach at too great of a distance?Study ResourcesFor today’s exam topics, refer to the following resources for more study.Resource Chapter Topic Where to Find ItFoundational ResourcesCCNA Exploration Chapter 7, “Basic Wireless Configure Wireless Section 7.3Online Curriculum: Concepts and Configuration” LAN AccessLAN Switching and Troubleshooting Simple Section 7.4WirelessWLAN ProblemsCCNA Exploration Chapter 7, “Basic Wireless Configure Wireless pp. 410–424LAN Switching and Concepts and Configuration” LAN AccessWireless Companion Troubleshooting Simple pp. 424–435GuideWLAN ProblemsICND1 Official Chapter 11, Deploying WLANs pp. 315–320Exam Certification Guide “Wireless LANs”ICND1 Authorized Chapter 3, Implementing a WLAN pp. 221–230Self-Study Guide“Wireless LANs”Supplemental ResourcesCCNA Flash Cards and ICND1, Section 7 Extending the LAN pp. 174–188Exam Practice Pack