The answer is to discover SNMP community strings via brute force. This is correct because the `nmap -sU -p 161,162 --script=snmp-brute` command specifically targets UDP ports 161 and 162—the standard SNMP ports—and invokes the snmp-brute script, which systematically tests common community strings like "public" and "private" against the target device. On the Certified Ethical Hacker CEH exam, this scenario tests your understanding of SNMP reconnaissance and the importance of community strings as weak authentication mechanisms in SNMPv1/v2c. A common trap is confusing this with a simple SNMP version detection scan or a service enumeration; remember that the `--script=snmp-brute` flag explicitly indicates a brute-force attack, not just a probe. A useful memory tip: think of SNMP community strings as "passwords" for network devices, and the snmp-brute script as a password guesser—if you see that script name, the goal is always credential discovery.
CEH Footprinting, Reconnaissance and Scanning Practice Question
This CEH practice question tests your understanding of footprinting, reconnaissance and scanning. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
During a penetration test, you run the command: nmap -sU -p 161,162 --script=snmp-brute 192.168.1.100. Which of the following is the PRIMARY goal of this scan?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Discover SNMP community strings via brute-force
The command uses the `-sU` flag for a UDP scan and targets ports 161 and 162, which are the standard SNMP ports. The `--script=snmp-brute` script attempts to brute-force SNMP community strings (the equivalent of passwords for SNMPv1/v2c). Therefore, the primary goal is to discover valid community strings, which is option A.
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.
✓
Discover SNMP community strings via brute-force
Why this is correct
The combination of UDP scan on SNMP ports with the snmp-brute script is used to brute-force community strings.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Perform a ping sweep to discover live hosts
Why it's wrong here
Ping sweep typically uses ICMP or TCP SYN on common ports, not a UDP scan with SNMP scripts.
✗
Identify open TCP ports and services on the target
Why it's wrong here
-sU is for UDP, not TCP. TCP scanning uses -sS or -sT.
✗
Enumerate SNMP MIB tree values
Why it's wrong here
Enumerating MIB values would require a different script like snmp-info or snmp-walk.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the `snmp-brute` script with SNMP MIB enumeration or general service discovery, but the script's explicit purpose is to brute-force community strings, not to read MIB values or scan TCP ports.
Detailed technical explanation
How to think about this question
SNMPv1 and v2c use community strings as a form of authentication, with 'public' often being the read-only default and 'private' the read-write default. The `snmp-brute` script in Nmap sends GetNextRequest PDUs with different community strings from a wordlist; if a valid string is found, the agent responds with a variable binding, confirming the string works. In real-world engagements, discovering a read-write community string can allow full configuration extraction or modification of the target device.
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 practitioner preparing for the CEH exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
Footprinting, Reconnaissance and Scanning — This question tests Footprinting, Reconnaissance and Scanning — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Discover SNMP community strings via brute-force — The command uses the `-sU` flag for a UDP scan and targets ports 161 and 162, which are the standard SNMP ports. The `--script=snmp-brute` script attempts to brute-force SNMP community strings (the equivalent of passwords for SNMPv1/v2c). Therefore, the primary goal is to discover valid community strings, which is option A.
What should I do if I get this CEH 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: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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