29 Questions
What is the primary function of an IPS detection engine?
Validating traffic by comparing it with known attack signatures
How are IPS sensors beneficial for growing networks?
Allowing for easy addition of new hosts and devices without adding sensors
What is the purpose of the IPS attack signatures package?
Containing a list of known attack signatures for validation
How does the amount of network traffic influence the choice of IPS sensors?
It determines the number of sensors needed for effective protection
Why are IPS sensors described as 'hardened'?
Their operating system is secured against vulnerabilities
What is the purpose of the realm-cisco.pub.key.txt file in IOS IPS configuration?
To configure the crypto key for verifying digital signatures
Why can only registered customers download the IOS IPS package files and crypto key?
To ensure authenticity and integrity of the downloaded files
Which step in configuring IOS IPS involves opening the realm-cisco.pub.key.txt file?
Step 3: Configure an IOS IPS crypto key
What is the role of the Cisco private key in IOS IPS configuration?
To sign the master signature file for authenticity
Which file is signed by a Cisco private key to guarantee authenticity and integrity in IOS IPS?
sigdef-default.xml
What is the main purpose of configuring an IOS IPS crypto key?
To verify digital signatures of signature files
What group of experts generates the Snort rule set updates for 4000 Series ISRs?
Cisco Talos
How can the router download rule sets for Snort IDS/IPS functionality?
Directly from cisco.com or a local server
Under what condition can disabled signatures from the Snort rule set be reenabled?
At any time
What are the minimum memory and flash requirements for running Snort IPS on a router?
8 GB of memory and 8 GB of flash
What type of subscriptions are available for Snort rule sets to keep current with the latest threat protection?
One or three-year term-based subscriptions
What is the focus of the Community Rule Set in terms of threat protection?
Reactive response to security threats
What is the main difference between an atomic signature and a composite signature?
Composite signatures involve a sequence of operations across hosts over time, while atomic signatures do not.
Why does an IPS use a configured event horizon in composite signatures?
To balance resources use and the ability to detect attacks over time.
What is the purpose of a signature file in Intrusion Prevention Systems (IPS)?
To contain all updated attack signatures for detection.
How often are lower priority IPS signature files typically published?
Biweekly
What is the key reason for updating the signature file regularly in an IPS?
To protect against new threats.
Which characteristic description matches pattern-based detection in IPS?
It searches for specific predefined patterns.
What action does retiring a signature in IOS IPS signify?
Removing the signature from memory
In IOS IPS, when should all signatures in the 'all' category be retired?
Before configuring IOS IPS
What is the purpose of the 'category category-name' command in IOS IPS?
To change a signature category
Which command is used to apply the IPS rule to a specific interface in IOS IPS?
ip ips rule-name [in | out] interface
What is the purpose of verifying the signature package using 'show ip ips signature count' command?
To check if the package is properly compiled
How are individual or group signatures retired or unretired in Cisco IOS CLI?
Through Cisco IOS CLI commands
Learn about network-based IPS sensors which are connected to network segments, can monitor many hosts, and are tuned for intrusion detection analysis. Explore how these sensors are essential for effectively protecting growing networks and can be added without needing additional sensors.
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