GCIH · Question #220
Which of the following techniques can be used to map 'open' or 'pass through' ports on a gateway?
The correct answer is D. Traceroute. Traceroute probes network paths using TTL manipulation and can identify open or pass-through ports on a gateway by observing whether port-specific packets are forwarded or dropped. The other three options are fictional tool names.
Question
Which of the following techniques can be used to map 'open' or 'pass through' ports on a gateway?
Options
- ATraceport
- BTracefire
- CTracegate
- DTraceroute
How the community answered
(31 responses)- A3% (1)
- C3% (1)
- D94% (29)
Why each option
Traceroute probes network paths using TTL manipulation and can identify open or pass-through ports on a gateway by observing whether port-specific packets are forwarded or dropped. The other three options are fictional tool names.
Traceport is not a real or recognized network security tool or technique.
Tracefire is not a real or recognized network security tool or technique.
Tracegate is not a real or recognized network security tool or technique.
Traceroute sends packets with incrementing TTL values to map the hop-by-hop path to a destination, and when combined with port-specific probing it can reveal which ports are permitted through a gateway by analyzing ICMP time-exceeded versus ICMP port-unreachable responses. This TTL-manipulation methodology is the technical foundation for identifying open or pass-through ports on filtering devices.
Concept tested: Traceroute for gateway open port mapping
Topics
Community Discussion
No community discussion yet for this question.