Here you have the best CertNexus CFR-310 practice exam questions
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.)
To address the issue of a flood of SMTP traffic to internal clients, the goal is to block unwanted SMTP traffic while allowing it only to designated email servers. The correct commands are: (1) iptables -A INPUT -p tcp –dport 25 -d x.x.x.x -j ACCEPT, which allows SMTP traffic to a specific email server, and (2) iptables -A INPUT -p tcp –dport 25 -j DROP, which blocks all other incoming SMTP traffic. These measures ensure that only legitimate email server communications are permitted while preventing the flood from affecting other internal clients.
A secretary receives an email from a friend with a picture of a kitten in it. The secretary forwards it to the ~COMPANYWIDE mailing list and, shortly thereafter, users across the company receive the following message:
“You seem tense. Take a deep breath and relax!”
The incident response team is activated and opens the picture in a virtual machine to test it. After a short analysis, the following code is found in C:
\Temp\chill.exe:Powershell.exe –Command “do {(for /L %i in (2,1,254) do shutdown /r /m Error! Hyperlink reference not valid.> /f /t / 0 (/c “You seem tense. Take a deep breath and relax!”);Start-Sleep –s 900) } while(1)”
Which of the following BEST represents what the attacker was trying to accomplish?
The C code snippet provided in the question contains the 'shutdown /r /m' command, where the '/r' parameter specifies a reboot. The 'Start-Sleep -s 900' command indicates a sleep duration of 900 seconds. 900 seconds is equal to 15 minutes. Thus, the attacker aimed to taunt the user with a message and then trigger a reboot every 15 minutes.
A Linux system administrator found suspicious activity on host IP 192.168.10.121. This host is also establishing a connection to IP 88.143.12.123. Which of the following commands should the administrator use to capture only the traffic between the two hosts?
To capture traffic specifically between two hosts, the correct command would involve specifying both hosts in the tcpdump filter. The command 'tcpdump -i eth0 host 88.143.12.123' will capture all traffic to and from 88.143.12.123. Since tcpdump interprets 'host' as capturing traffic where either the source or destination matches the given IP address, and considering that the command is issued from the host 192.168.10.121, it ensures that all interactions between 192.168.10.121 and 88.143.12.123 are captured.
After imaging a disk as part of an investigation, a forensics analyst wants to hash the image using a tool that supports piecewise hashing. Which of the following tools should the analyst use?
To perform piecewise hashing, the analyst should use the tool 'hashdeep'. Hashdeep supports multiple hash functions and can perform piecewise hashing, which involves hashing large files by dividing them into smaller chunks. This feature is essential for forensic investigations to ensure data integrity and to manage large datasets efficiently.
Which of the following is a cybersecurity solution for insider threats to strengthen information protection?
Data loss prevention (DLP) is a cybersecurity solution that focuses on preventing sensitive data from being accessed, used, or transmitted improperly, especially by insiders. DLP systems monitor data movements and can block unauthorized access or transfer of sensitive information, making it an effective solution for mitigating insider threats.