Quick Answer
The answer is traceroute, the technique specifically designed for network topology discovery by revealing the path packets take to a destination. It works by sending packets with incrementing Time-to-Live (TTL) values; each router along the route decrements the TTL and, when it reaches zero, sends back an ICMP Time Exceeded message, thereby disclosing its IP address and identifying intermediate devices like routers and firewalls. On the Certified Ethical Hacker CEH exam, this question tests your understanding of reconnaissance and footprinting tools—traceroute is often contrasted with ping or pathping, but only traceroute systematically maps each hop. A common trap is confusing it with a simple connectivity test; remember that traceroute’s core purpose is hop-by-hop path discovery, not just reachability. Memory tip: think “TTL tells the tale”—each decrement reveals a new device on the route.
This CEH practice question tests your understanding of scanning networks and enumeration. 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.
You are conducting a security assessment and need to map the network topology and identify routers, firewalls, and other network devices. Which technique is specifically designed to discover the path packets take to reach a destination and can reveal intermediate devices?
Traceroute
Traceroute increments TTL to get ICMP time-exceeded messages from routers, revealing the path.
Banner grabbing
Why wrong: Banner grabbing identifies services, not network topology.
DNS enumeration
Why wrong: DNS enumeration reveals hostnames and IPs but not the network path.
SNMP walk
Why wrong: SNMP walk retrieves MIB data, not routing paths.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Traceroute
Traceroute is the correct technique because it is specifically designed to map the path packets take from a source to a destination by manipulating the Time-to-Live (TTL) field in IP headers. As each hop decrements the TTL, routers along the path send ICMP Time Exceeded messages (or UDP responses in some implementations), revealing their IP addresses and thus identifying intermediate devices like routers and firewalls.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Traceroute
Why this is correct
Traceroute increments TTL to get ICMP time-exceeded messages from routers, revealing the path.
Related concept
Read the scenario before looking for a memorised answer.
Banner grabbing
Why it's wrong here
Banner grabbing identifies services, not network topology.
DNS enumeration
SNMP walk
Why it's wrong here
SNMP walk retrieves MIB data, not routing paths.
Common exam traps
The trap here is that candidates often confuse traceroute with ping (which only tests reachability and RTT, not hop-by-hop path discovery) or assume banner grabbing can reveal network topology, but only traceroute systematically identifies each intermediate device along the route.
Detailed technical explanation
Traceroute works by sending packets with incrementing TTL values (starting at 1); the first router decrements TTL to 0 and replies with an ICMP Time Exceeded message (Type 11, Code 0), revealing its IP. On Windows, traceroute uses ICMP Echo Requests, while on Linux/macOS it typically uses UDP packets to high ports, causing routers to send ICMP Time Exceeded and the destination to send ICMP Port Unreachable. In real-world scenarios, firewalls may block ICMP or UDP traceroute, so TCP-based traceroute (e.g., using SYN packets to port 80) can bypass such filters to map the path.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Scanning Networks and Enumeration — This question tests Scanning Networks and Enumeration — Read the scenario before looking for a memorised answer..
The correct answer is: Traceroute — Traceroute is the correct technique because it is specifically designed to map the path packets take from a source to a destination by manipulating the Time-to-Live (TTL) field in IP headers. As each hop decrements the TTL, routers along the path send ICMP Time Exceeded messages (or UDP responses in some implementations), revealing their IP addresses and thus identifying intermediate devices like routers and firewalls.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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