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ccna 50 discount.5.3.1 Configuring CiscoIOS IPS using the CLI5.3.1.1 Enforcing IOS IPSCiscoIOS IPS enables administrators to manage intrusion prevention on the router. CiscoIOSIPS detects and defends against intrusions by comparing data streams with the characteristics of known threats and blocking those streams when a threat is detected. Using CiscoIOSCLI in concert with IOSIPS 5.x format features to work requires a series of steps oCiscoIOS 12.4 (10) or earlierversions use IPS 4.x format features, and some IPS commands have been modified. In order to execute IOS1PS, the following steps need to be performed. Step 1 Download the IOSIPS file. Step 2 Create the IOSIPS configuration directory in flash memory (flash). Step 3 Configure the IOSIPS encryption key. Step 4 Enable IOSIPSo Step 5 Load the IOSIPS feature package to the router.5.3.1.2 Download the IOSIPS fileCiscoIOS version 12.4(U)T and earlier provide built-in features in the Cisco IOS software image and also provide support for imported features. The selection of IPS features involves loading an XML file on the router. This file, called a Feature Definition File (SDF), contains a detailed description of each selected feature using the Cisco IPS Sensor Software 4.x feature format.5.3 Implementing IPS 137 In newer IOS releases, features are no longer built into the CiscoIOS software (hard-coded), instead all features are stored in a separate feature file and must be imported. IOS 12.4(15)T4 and later releases use the new 5.x format feature files that can be downloaded from cisco.com ± (this requires a user account). Step 1 Download the IOSIPS file. Before configuring the IPS, you need to download the IOSIPS feature package and public encryption key from cisco.com. The specific IPS file download depends on the current version. Only registered users can download the package files and keys.lOS-Sxxx-CLI.pkg-This is the latest feature package.realm-cisco.pub.key.txt ------- This is the public encryption key used by IOSIPS.Step 2 Create the IOS IPS configuration directory in flash memory. The second step is to create a directory in flash memory to hold feature files and configurations. Use the mkdirdirectory-name privileged execution command to create this directory in flash memory. I. The IPS supports Cisco IOS file systems in any configuration location as long as they are Ding correctly write accessible. The Cisco USB flash drive is attached to the USB side of the router and can be used as an alternative location for saving feature files and configurations. If you use the USB flash drive as a location for the IOSIPS to save configuration records, it must remain connected to the router's USB port.