GCFA · Question #147
John works as a professional Ethical Hacker. He has been assigned the task of testing the security information to begin scanning in order to detect active computers. He sends a ping request to a…
The correct answer is D. Timestamp request (obsolete). ICMP type 13 is defined as a Timestamp Request message, an obsolete ICMP type distinct from the Echo Request (type 8) used in standard ping operations.
Question
John works as a professional Ethical Hacker. He has been assigned the task of testing the security information to begin scanning in order to detect active computers. He sends a ping request to a computer using ICMP type 13. What kind of ICMP message is John using to send the ICMP ping request message?
Options
- AAddress mask request
- BEcho request
- CInformation request (obsolete)
- DTimestamp request (obsolete)
How the community answered
(52 responses)- A8% (4)
- B17% (9)
- C4% (2)
- D71% (37)
Why each option
ICMP type 13 is defined as a Timestamp Request message, an obsolete ICMP type distinct from the Echo Request (type 8) used in standard ping operations.
ICMP type 17 is the Address Mask Request, not type 13 - it was used to request the subnet mask from a router and is also considered obsolete.
ICMP type 8 is the Echo Request used in standard ping operations to test host reachability, which is a completely different type number and function from type 13.
ICMP type 15 is the Information Request (obsolete), used to request network address information, and is not the same as type 13.
ICMP type 13 is the Timestamp Request message, now considered obsolete per IANA and RFC 792, which was originally used to query the current time from a remote host rather than test reachability as a standard Echo Request does.
Concept tested: ICMP message type numbering and classification
Source: https://www.iana.org/assignments/icmp-parameters/icmp-parameters.xhtml
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