CHFI Computer Forensics Lab — 10 Questions

Question 1

During a forensic investigation, an analyst needs to acquire data from a live Windows system without altering the system's state. Which tool should the analyst use to capture the contents of RAM?

Accepted Answer

FTK Imager Lite. FTK Imager Lite is designed for live forensic acquisition on Windows systems, including capturing RAM contents without altering the system state. It uses a lightweight, read-only approach that avoids writing to the disk or modifying memory pages, preserving the integrity of the evidence.

Answer

dd

Answer

EnCase

Answer

WinHex

Question 2

A forensic lab is designing a network architecture to ensure the integrity of evidence during acquisition. What is the most critical design consideration?

Accepted Answer

Implement hardware write-blockers on all acquisition stations. Hardware write-blockers are the most critical design consideration because they physically prevent any write operations to the source drive at the ATA/SCSI command level, ensuring that the evidence remains bit-for-bit unchanged during acquisition. Without a hardware write-blocker, even a single read operation from a forensic workstation could inadvertently modify metadata (e.g., last access timestamps) or trigger anti-forensic mechanisms, compromising the integrity of the evidence and its admissibility in court.

Answer

Deploy multiple forensic workstations to parallelize tasks

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Use a segmented network to isolate forensic tools

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Encrypt all data in transit over the network

Question 3

A forensic analyst is troubleshooting a write-blocker that is not working correctly. The analyst connected the write-blocker between the suspect drive and the forensic workstation, but the workstation still shows the drive as writable. What is the most likely cause?

Accepted Answer

The suspect drive was connected before the write-blocker was powered on. When a write-blocker is powered on after the suspect drive is already connected, the drive may have already been enumerated by the operating system as a writable device. Write-blockers rely on intercepting and filtering ATA/SCSI commands at the hardware level before the OS sees the drive; if the drive is connected first, the OS may have already sent write commands or cached write attributes, bypassing the blocker's protection. This is why the proper sequence is to power on the write-blocker first, then connect the suspect drive.

Answer

The write-blocker does not have external power

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The suspect drive uses SATA but the write-blocker is USB-only

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The write-blocker is connected to the suspect drive's output port

Question 4

A forensic lab is establishing a chain of custody procedure. Which practice is considered best according to CHFI guidelines?

Accepted Answer

Document every transfer of evidence with signatures and timestamps. Option D is correct because the chain of custody is fundamentally a legal and procedural requirement to demonstrate the integrity and admissibility of digital evidence. CHFI guidelines emphasize that every transfer of evidence must be meticulously documented with signatures, timestamps, and purpose to create an unbroken audit trail, which is the only practice that directly satisfies the legal standard for evidence handling.

Answer

Require biometric authentication for all lab personnel

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Store evidence in a secure room with limited access

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Use encryption to protect evidence files

Question 5

Which TWO of the following are essential components of a computer forensics lab according to CHFI best practices?

Accepted Answer

Evidence storage area with controlled access. Option B is correct because a computer forensics lab must have a secure evidence storage area with controlled access to maintain the chain of custody and prevent tampering or unauthorized access to digital evidence. CHFI best practices emphasize physical security controls, such as biometric locks or access logs, to ensure evidence integrity throughout the investigation lifecycle.

Answer

Server farm for data processing

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Public-facing website for case management

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Coffee machine for staff convenience

Question 6

Which THREE of the following are recommended practices for maintaining the integrity of digital evidence in a forensics lab?

Accepted Answer

Maintain a detailed chain of custody log. Maintaining a detailed chain of custody log (Option A) is a recommended practice because it provides a verifiable, chronological record of every person who handled the evidence, the time and date of each transfer, and the purpose of each transfer. This ensures the evidence's integrity by demonstrating that it has not been tampered with or altered from the moment of seizure through analysis and presentation in court. Without a proper chain of custody, the evidence can be challenged as inadmissible under rules like Federal Rule of Evidence 901.

Answer

Perform regular backups of all evidence

Answer

Run antivirus scans on evidence before analysis

Question 7

You are a forensic analyst in a corporate lab. A compromised server was taken offline and brought to the lab. The server runs Windows Server 2019 with a RAID 5 array of three 1TB SATA drives. The drives are hot-swappable. The server was shut down properly before removal. The lab has a forensic workstation with write-blockers, a hardware RAID controller, and imaging software. The analyst needs to acquire a forensic image of the RAID array. What is the correct course of action?

Accepted Answer

Reconstruct the RAID array using the same controller model in the lab, then image the logical volume via a write-blocker. Option A is correct because the RAID 5 array must be reconstructed using the same controller model (or an identical one) to correctly interpret the parity and striping metadata. Imaging the logical volume via a write-blocker preserves the integrity of the file system and ensures a forensically sound acquisition of the live data, which is the standard practice when the controller is available and the array is intact.

Answer

Send the drives to a vendor for specialized RAID recovery

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Image each drive individually using a write-blocker and then combine the images in software

Answer

Connect all drives to the forensic workstation and use a software RAID tool to assemble the array

Question 8

A forensic lab manager is setting up a new lab and must decide on the physical security measures. Which of the following is the MOST important to implement first?

Accepted Answer

Implement a biometric access control system. Biometric access control is the most critical first step because it establishes a foundational layer of physical security that authenticates and authorizes personnel before they can access the lab. Without controlling who enters, other measures like CCTV or fire suppression are less effective, as unauthorized individuals could compromise evidence integrity. This aligns with the principle of defense-in-depth, where access control is the primary barrier against tampering or theft.

Answer

Construct Faraday cages around the evidence storage area

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Deploy CCTV cameras covering all entry points

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Install a gas-based fire suppression system

Question 9

Refer to the exhibit. A forensic examiner is analyzing a Windows system and sees the above NTFS file metadata. The user claims the file was last accessed at 09:15. Which of the following best explains the discrepancy?

Accepted Answer

The $UsnJrnl entry shows the file was modified, and the last access time was updated by the system when the file was opened for reading. Option A is correct because the $UsnJrnl (Update Sequence Number Journal) records that the file was modified, and on Windows systems, when a file is opened for reading, the last access time is updated by default. The discrepancy arises because the user claims the file was last accessed at 09:15, but the NTFS metadata shows a different last access time, which could be due to the system updating the last access time upon modification or read operations, as recorded in the $UsnJrnl.

Answer

The system has disabled last access time updates, so the reported times are unreliable

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The creation time is earlier than the last access, indicating the file was copied from another volume

Answer

The $LogFile sequence number indicates a transaction rollback that reset the timestamps

Question 10

Which TWO of the following are essential requirements for a computer forensics lab according to best practices?

Accepted Answer

Uninterruptible power supply (UPS) and surge protectors. A is correct because a UPS provides temporary power during outages to prevent data loss or corruption during forensic imaging, while surge protectors guard against voltage spikes that could damage sensitive lab equipment. Best practices require both to ensure chain of custody integrity and hardware reliability.

Answer

Offsite cloud storage for all case files

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Shared workstations to reduce hardware costs

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Open wireless network for flexibility