The answer is a brute-force attack against FTP and Telnet services. This is correct because the script uses the ftplib and telnetlib libraries to attempt a single predefined username and password pair across multiple IP addresses, systematically testing each host for successful authentication. On the CompTIA PenTest+ PT0-002 exam, this scenario tests your ability to distinguish between credential-stuffing, password-spraying, and brute-force attacks; a common trap is confusing this with a dictionary attack, but the key difference here is the use of a single credential pair against many targets rather than many passwords against one target. To remember this, think of the script as a "spray can" of one password across a list of doors—if any door opens, you've brute-forced your way in.
PT0-002 Tools and Code Analysis Practice Question
This PT0-002 practice question tests your understanding of tools and code analysis. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A penetration tester is reviewing a Python script that automates a common network attack. The script imports the 'ftplib' and 'telnetlib' libraries. It reads a list of IP addresses from a file and, for each host, attempts to connect using a predefined username and password. If the connection succeeds, it logs the success. Which attack is the script most likely performing?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Brute-force attack against FTP and Telnet services
The script uses FTP and Telnet libraries to attempt connections with a known username and password, which is a brute-force attack against those services.
B
Vulnerability scanning for open ports
Why wrong: A vulnerability scanner would check for known vulnerabilities, not attempt to authenticate with a single credential pair.
C
Password spraying attack against web applications
Why wrong: Password spraying typically targets web login forms, not FTP or Telnet protocols. The libraries used are specific to FTP and Telnet.
D
Service enumeration using banner grabbing
Why wrong: Service enumeration would involve connecting and reading banners without authentication attempts; this script attempts to log in.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Brute-force attack against FTP and Telnet services
The script uses 'ftplib' and 'telnetlib' to attempt connections with a predefined username and password against multiple IP addresses. This is characteristic of a brute-force attack, where the attacker tries a single credential pair against many hosts to gain unauthorized access to FTP and Telnet services.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Brute-force attack against FTP and Telnet services
Why this is correct
The script uses FTP and Telnet libraries to attempt connections with a known username and password, which is a brute-force attack against those services.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Vulnerability scanning for open ports
Why it's wrong here
A vulnerability scanner would check for known vulnerabilities, not attempt to authenticate with a single credential pair.
✗
Password spraying attack against web applications
Why it's wrong here
Password spraying typically targets web login forms, not FTP or Telnet protocols. The libraries used are specific to FTP and Telnet.
✗
Service enumeration using banner grabbing
Why it's wrong here
Service enumeration would involve connecting and reading banners without authentication attempts; this script attempts to log in.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing a brute-force attack (single credential against many hosts) with a password spraying attack (many usernames against a single host), leading candidates to incorrectly select option C when the script's logic clearly targets multiple hosts with one credential pair.
Detailed technical explanation
How to think about this question
FTP (port 21) and Telnet (port 23) are legacy protocols that transmit credentials in cleartext, making them prime targets for brute-force attacks. The script's use of a predefined username/password pair suggests a dictionary or common credential attack, where the attacker reuses known weak credentials across many hosts to find vulnerable systems. In real-world engagements, this technique is often automated to quickly identify misconfigured devices or servers with default credentials.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PT0-002 question in full detail.
Tools and Code Analysis — This question tests Tools and Code Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Brute-force attack against FTP and Telnet services — The script uses 'ftplib' and 'telnetlib' to attempt connections with a predefined username and password against multiple IP addresses. This is characteristic of a brute-force attack, where the attacker tries a single credential pair against many hosts to gain unauthorized access to FTP and Telnet services.
What should I do if I get this PT0-002 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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