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NEW QUESTION # 19
A small company must create a temporary detection solution for distributed denial-of-service attacks. An engineer installs Suricata IDPS on an Ubuntu virtual machine and adds a denial-of-service detection rule.
Which rule headers must be used to alert on a SYN-flood attack?
Answer: B
Explanation:
A SYN flood abuses the TCP handshake, so the applicable Suricata signature must inspect TCP traffic rather than DNS- or HTTP-only application traffic. Option B correctly scopes traffic between the untrusted
$EXTERNAL_NET and protected $HOME_NET, including the inbound direction in which attack SYN packets would normally arrive and the return direction used for correlation. Option C is unnecessarily broad because any ignores the defined trust boundaries. Strictly speaking, the displayed lines are only rule headers; a production SYN-flood signature must also include options that identify SYN-only behavior and a rate condition, such as TCP flags and a threshold or detection filter. Without those options, it would alert on ordinary TCP traffic. Suricata's official rule documentation confirms that a header defines action, protocol, addresses, ports, and direction. This belongs to CBRFIR incident-alert interpretation and mitigation. Suricata rule format
NEW QUESTION # 20
Refer to the exhibit.
A security analyst is reviewing alerts from the SIEM system that was just implemented and notices a possible indication of an attack because the SSHD system just went live and there should be nobody using it. Which action should the analyst take to respond to the alert?
Answer: C
Explanation:
The log entry shows a failed SSH login attempt for an invalid user "admin" from IP 192.168.1.100. As the system has just gone live and no legitimate use is expected, this could be an early reconnaissance or brute- force attempt. However, blocking IPs or resetting passwords without fully understanding the context could lead to incomplete remediation or false positives.
According to Cisco CyberOps best practices, the first step is to thoroughly investigate the alert by correlating it with other logs (e.g., authentication logs, IDS/IPS logs) to determine the intent and scope of activity.
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NEW QUESTION # 21
An engineer notices irregular traffic spikes during off-hours in a network-monitoring tool. The spikes involve large outbound data transfers to an IP address geolocated in a high-risk jurisdiction. The traffic uses encrypted channels typically associated with secure file transfers. Which action should the engineer take to analyze the network traffic associated with these potentially malicious activities?
Answer: D
Explanation:
Option B is the only choice that performs evidence-driven traffic analysis. The engineer should inspect available packet and flow metadata, identify source and destination endpoints, measure transfer timing and volume, and correlate the external infrastructure with reliable threat intelligence. Encryption protects content in transit but does not prove the communication is benign; destination, certificate, protocol, session, and flow characteristics can still expose malicious activity. Increasing bandwidth merely accommodates possible exfiltration, while delaying analysis for maintenance leaves the risk unresolved. CBRFIR Forensics Processes objective 4.3 specifically requires analysis of traffic associated with malicious activity using network- monitoring tools, including NetFlow and Wireshark. Incident Response Techniques objective 3.9 also supports correlating internal observations with external threat intelligence to determine IOCs and IOAs.
Preserve packet captures and flow records before containment changes remove volatile evidence. Cisco CBRFIR v1.2 exam topics
NEW QUESTION # 22
Which tool conducts memory analysis?
Answer: C
NEW QUESTION # 23
Which antiforensic technique is associated with deliberately misleading forensic analysts by altering the content of digital artifacts, making it difficult to reconstruct the original data accurately?
Answer: A
Explanation:
Data tampering is the deliberate alteration, insertion, or deletion of information within a digital artifact so the evidence no longer represents its original state. That directly matches the scenario: the analyst is misled because reconstructing authentic content and establishing integrity become more difficult. Timestamp manipulation is narrower; it changes temporal metadata to falsify a sequence of events but does not necessarily alter the artifact's substantive content. Geolocation spoofing falsifies location-related information, while memory forensics is an investigative discipline rather than an antiforensic action. Analysts counter tampering by preserving originals, acquiring forensic images, calculating cryptographic hashes, maintaining chain-of-custody records, and comparing copies with trusted baselines. The question falls under CBRFIR Fundamentals objective 1.3, covering antiforensic tactics, techniques, and procedures, with related coverage of evidence-hindering practices in objective 4.1. Cisco CBRFIR v1.2 exam topics
NEW QUESTION # 24
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