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 (B)</p> Signup and view all the answers

Why are IPS sensors described as 'hardened'?

<p>Their operating system is secured against vulnerabilities (C)</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 (B)</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 (D)</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 (A)</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 (A)</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 (A)</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 (C)</p> Signup and view all the answers

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

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

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

<p>At any time (B)</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 (C)</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 (C)</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 (A)</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. (D)</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. (D)</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. (A)</p> Signup and view all the answers

How often are lower priority IPS signature files typically published?

<p>Biweekly (D)</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. (A)</p> Signup and view all the answers

Which characteristic description matches pattern-based detection in IPS?

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

What action does retiring a signature in IOS IPS signify?

<p>Removing the signature from memory (C)</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 (B)</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 (D)</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 (A)</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 (B)</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 (D)</p> Signup and view all the answers

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