PT0-002 Practice Question: Information Gathering and Vulnerability Scanning
This PT0-002 practice question tests your understanding of information gathering and vulnerability 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.
A penetration tester is performing internal reconnaissance from a compromised host and wants to map the local network without sending any packets. Which technique is most suitable?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use tcpdump to passively capture and analyze broadcast traffic.
Option A is correct because tcpdump can passively capture broadcast traffic (e.g., ARP, NetBIOS, mDNS) without sending any packets. This allows the tester to map active hosts and services on the local network by listening to existing network chatter, fulfilling the 'no packets sent' constraint.
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.
✓
Use tcpdump to passively capture and analyze broadcast traffic.
Why this is correct
Passive capture of broadcast frames (ARP, DHCP, etc.) reveals live hosts and their IP addresses without sending a single packet.
Related concept
Read the scenario before looking for a memorised answer.
✗
Send ARP requests to all possible IP addresses using a ping sweep.
Why it's wrong here
ARP requests are active and generate traffic that can be detected by network monitors or intrusion detection systems.
✗
Query the local DNS server for all host records in the domain.
Why it's wrong here
This is an active query that may be logged, and the DNS server may not reveal all hosts, especially workstations not registered in DNS.
✗
Use traceroute to discover network paths.
Why it's wrong here
Traceroute sends packets with varying TTL values, which is active and detectable.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume 'passive' techniques like tcpdump still require sending packets, or they confuse passive capture with active scanning methods like ARP sweeps or DNS queries, which inherently generate network traffic.
Detailed technical explanation
How to think about this question
Passive reconnaissance using tcpdump leverages promiscuous mode to capture Ethernet frames, including broadcast ARP requests and responses, DHCP leases, and NetBIOS name service broadcasts. In a real-world scenario, this technique is stealthy and avoids detection by network intrusion detection systems (NIDS) that monitor for active scanning patterns. Subtle behaviors include capturing IPv6 neighbor discovery packets or LLMNR traffic, which can reveal hosts not visible via IPv4 ARP.
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 analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PT0-002 question in full detail.
Information Gathering and Vulnerability Scanning — This question tests Information Gathering and Vulnerability Scanning — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use tcpdump to passively capture and analyze broadcast traffic. — Option A is correct because tcpdump can passively capture broadcast traffic (e.g., ARP, NetBIOS, mDNS) without sending any packets. This allows the tester to map active hosts and services on the local network by listening to existing network chatter, fulfilling the 'no packets sent' constraint.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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