Network-Based IPS Sensors
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Questions and Answers

What is the primary function of an IPS detection engine?

  • Ensuring easy addition of new sensors to the network
  • Maintaining network segmentation for multiple hosts
  • Enhancing hardware for intrusion detection analysis
  • Validating traffic by comparing it with known attack signatures (correct)

    • How are IPS sensors beneficial for growing networks?

  • Allowing for easy addition of new hosts and devices without adding sensors (correct)
  • Enabling frequent updates to the IPS attack signatures package
  • Facilitating network segmentation for new networks
  • Providing dedicated hardware for intrusion detection analysis

    • What is the purpose of the IPS attack signatures package?

  • Adding new hosts to the network without affecting sensors
  • Connecting sensors to network segments
  • Tuning intrusion detection appliances
  • Containing a list of known attack signatures for validation (correct)

    • How does the amount of network traffic influence the choice of IPS sensors?

    <p>It determines the number of sensors needed for effective protection</p> Signup and view all the answers

    Why are IPS sensors described as 'hardened'?

    <p>Their operating system is secured against vulnerabilities</p> Signup and view all the answers

    What is the purpose of the realm-cisco.pub.key.txt file in IOS IPS configuration?

    <p>To configure the crypto key for verifying digital signatures</p> Signup and view all the answers

    Why can only registered customers download the IOS IPS package files and crypto key?

    <p>To ensure authenticity and integrity of the downloaded files</p> Signup and view all the answers

    Which step in configuring IOS IPS involves opening the realm-cisco.pub.key.txt file?

    <p>Step 3: Configure an IOS IPS crypto key</p> Signup and view all the answers

    What is the role of the Cisco private key in IOS IPS configuration?

    <p>To sign the master signature file for authenticity</p> Signup and view all the answers

    Which file is signed by a Cisco private key to guarantee authenticity and integrity in IOS IPS?

    <p>sigdef-default.xml</p> Signup and view all the answers

    What is the main purpose of configuring an IOS IPS crypto key?

    <p>To verify digital signatures of signature files</p> Signup and view all the answers

    What group of experts generates the Snort rule set updates for 4000 Series ISRs?

    <p>Cisco Talos</p> Signup and view all the answers

    How can the router download rule sets for Snort IDS/IPS functionality?

    <p>Directly from cisco.com or a local server</p> Signup and view all the answers

    Under what condition can disabled signatures from the Snort rule set be reenabled?

    <p>At any time</p> Signup and view all the answers

    What are the minimum memory and flash requirements for running Snort IPS on a router?

    <p>8 GB of memory and 8 GB of flash</p> Signup and view all the answers

    What type of subscriptions are available for Snort rule sets to keep current with the latest threat protection?

    <p>One or three-year term-based subscriptions</p> Signup and view all the answers

    What is the focus of the Community Rule Set in terms of threat protection?

    <p>Reactive response to security threats</p> Signup and view all the answers

    What is the main difference between an atomic signature and a composite signature?

    <p>Composite signatures involve a sequence of operations across hosts over time, while atomic signatures do not.</p> Signup and view all the answers

    Why does an IPS use a configured event horizon in composite signatures?

    <p>To balance resources use and the ability to detect attacks over time.</p> Signup and view all the answers

    What is the purpose of a signature file in Intrusion Prevention Systems (IPS)?

    <p>To contain all updated attack signatures for detection.</p> Signup and view all the answers

    How often are lower priority IPS signature files typically published?

    <p>Biweekly</p> Signup and view all the answers

    What is the key reason for updating the signature file regularly in an IPS?

    <p>To protect against new threats.</p> Signup and view all the answers

    Which characteristic description matches pattern-based detection in IPS?

    <p>It searches for specific predefined patterns.</p> Signup and view all the answers

    What action does retiring a signature in IOS IPS signify?

    <p>Removing the signature from memory</p> Signup and view all the answers

    In IOS IPS, when should all signatures in the 'all' category be retired?

    <p>Before configuring IOS IPS</p> Signup and view all the answers

    What is the purpose of the 'category category-name' command in IOS IPS?

    <p>To change a signature category</p> Signup and view all the answers

    Which command is used to apply the IPS rule to a specific interface in IOS IPS?

    <p>ip ips rule-name [in | out] interface</p> Signup and view all the answers

    What is the purpose of verifying the signature package using 'show ip ips signature count' command?

    <p>To check if the package is properly compiled</p> Signup and view all the answers

    How are individual or group signatures retired or unretired in Cisco IOS CLI?

    <p>Through Cisco IOS CLI commands</p> Signup and view all the answers

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