Free CFR-410: CyberSec First Responder (CFR) Exam Questions and Answers
98 verified practice questions for CFR-410.
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Last updated: September 19, 2026
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- CFR-410
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Question #1
A company website was hacked via the following SQL query: email, passwd, login_id, full_name FROM members WHERE email = “attacker@somewhere.com”; DROP TABLE members; –” Which of the following did the hackers perform?
Please select an optionIncorrectCorrect answer: B
The appended DROP TABLE members command removes the whole table and its data. Because the statement drops the table rather than targeting specific rows, only the entire-table deletion is accurate.
Was this answer correct?Question #2
After a hacker obtained a shell on a Linux box, the hacker then sends the exfiltrated data via Domain Name System (DNS). This is an example of which type of data exfiltration?
Please select an optionIncorrectCorrect answer: A
DNS is a permitted protocol not intended to carry file data, so tunneling stolen data inside queries hides it in legitimate traffic: a covert channel.
Was this answer correct?Question #3
A security investigator has detected an unauthorized insider reviewing files containing company secrets. Which of the following commands could the investigator use to determine which files have been opened by this user?
Please select an optionIncorrectCorrect answer: B
lsof lists open files and the processes and users holding them, revealing which documents the insider accessed. ls only lists directory contents, ps shows processes, and netstat shows connections.
Was this answer correct?Question #4
A network security analyst has noticed a flood of Simple Mail Transfer Protocol (SMTP) traffic to internal clients. SMTP traffic should only be allowed to email servers. Which of the following commands would stop this attack? (Choose two.)
Select 2 answers.
Please select an optionIncorrectCorrect answer: A, C
Dropping all inbound TCP 25 stops SMTP to internal clients, while the ACCEPT rule for destination x.x.x.x placed first preserves mail delivery to the legitimate email server.
Was this answer correct?Question #5
Nmap is a tool most commonly used to:
Please select an optionIncorrectCorrect answer: C
Nmap discovers live hosts, open ports and service versions across a network; it is not a wardriving, session-enumeration or web application scanner.
Was this answer correct?Question #6
According to company policy, all accounts with administrator privileges should have suffix _ja. While reviewing Windows workstation configurations, a security administrator discovers an account without the suffix in the administrator’s group. Which of the following actions should the security administrator take?
Please select an optionIncorrectCorrect answer: B
Group membership changes for domain accounts are recorded as security events on a domain controller, so its security log shows who created or added the non-compliant administrator account.
Was this answer correct?Question #7
Tcpdump is a tool that can be used to detect which of the following indicators of compromise?
Please select an optionIncorrectCorrect answer: A
tcpdump captures and displays packets on the wire, so it reveals unusual traffic patterns and destinations. Open ports come from port scanners, and performance metrics from monitoring tools.
Was this answer correct?Question #8
A Linux administrator is trying to determine the character count on many log files. Which of the following command and flag combinations should the administrator use?
Please select an optionIncorrectCorrect answer: C
wc -m prints the character count of each file. tr -d deletes characters, uniq -c counts repeated lines, and grep -c counts matching lines.
Was this answer correct?Question #9
A first responder notices a file with a large amount of clipboard information stored in it. Which part of the MITRE ATT&CK matrix has the responder discovered?
Please select an optionIncorrectCorrect answer: A
Clipboard data capture is classified under the Collection tactic, which covers techniques for gathering information of interest. Discovery, lateral movement and exfiltration describe different stages of an intrusion.
Was this answer correct?Question #10
Which of the following are common areas of vulnerabilities in a network switch? (Choose two.)
Select 2 answers.
Please select an optionIncorrectCorrect answer: A, B
Switches ship with unsecured default port state (all ports enabled, often in one VLAN) and well-known default credentials, both of which attackers exploit unless changed during hardening.
Was this answer correct?
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