ccna 5 chapter 3 exam answers

ccna 5 chapter 3 exam answers.features are released semi-monthly. If the threat is serious, Cisco will release the feature within a few hours of identification.To protect the network, the feature file must be upgraded periodically. Each upgrade contains new features and all features from all previous versions. For example, the feature file IOS-S595-CLI.pkg contains all features from all IOS-S594-CLLpkg files, plus features created for subsequently discovered threats.Just as virus checks must continually update their databases, network administrators must always be vigilant and update the IPS feature files regularly. Available new features can be found at cisco.com±. In order to retrieve features, a cisco.com account is required. Note: The automatic update option for IPS feature definition files on ISR G2 routers saves time and ensures real-time threat defense.5.2.2 IPS Feature Alerts5.2.2.1 Feature Glance ReportCentral to any IPS feature is the feature alert, often also referred to as a feature trigger. For a home security system, the triggering mechanism used as a burglar alarm is a motion detector that monitors the activity of a person when that person enters a room protected by the alarm.The IPS sensor feature trigger can be anything that can reliably signal when an intrusion or security policy violation occurs. A network IPS triggers a feature action when it detects that a packet load contains a specific string going to a specific port. A host-based IPS triggers a feature action when a specific function is triggered (a function call is an expression that passes control and parameters to a function). Anything that can be reliably signaled in the event of an intrusion or security policy violation can be used as a triggering mechanism.Cisco IDS and IPS sensors (such as the Cisco IPS 4300 series sensors and the Cisco Catalyst 6500IDSM-2) canuse four feature trigger types: Pattern-based detection; Anomaly-based detection; Policy-based detection; and Honeypot-based detection.These triggering mechanisms can be applied to both atomic and combinatorial features. The triggering mechanisms can be simple or complex. Each IPS combines features that use one or more of the basic trigger mechanisms to trigger feature behavior.