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where to buy ccna book.Starting with WCS version 4.2, the WCS code upgrade script upgrades the WCS while preserving the directories, rootpassword, and license information. This operation is automatic and consists only of downloading the installation file from the Cisco website and running the file on the device where WCS is installed. During the installation process, you are prompted to detect a previous installation and asked to select either upgrade or install. If you select Upgrade, it will retain all information from the previous installation. If you choose the install option, it will assume that no previous WCS exists, i.e., this is a new installation.19.2.4 Managing ConfigurationWhen working in a Cisco Unified Wireless environment, there are a number of configuration files to deal with. You may have a large number of controller configuration files and AP configuration files. When running the controller, it is a good idea to save your configuration often. Click the SaveConfiguration link to save the controller configuration. This link can be found in the upper right corner of the Web interface, as shown in Figure 19.8.Figure 19-8 Save Configuration19.2 Basic Topics 322In addition to saving the configuration to NVRAM, you can also back up this configuration to a remote TFTP server. Saving the configuration on TFTPSaving a configuration on the TFTP is similar to upgrading the controller, except this time the files are transferred in the opposite direction. Installation requires the use ofTFTP server software, which is installed on the destination computer where the files need to be backed up. TFTP uses UDP port 69,so make sure there are no obstructions in the transfer path, such as firewalls, that might block this type of traffic. If you have upgraded from a TFTPserver, then you probably won't have any problems.