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EC-Council

312-50V13 · Question #331

When conducting a penetration test, it is crucial to use all means to get all available information about the target network. One of the ways to do that is by sniffing the network. Which of the…

The correct answer is B. Modifying and replaying captured network traffic. Passive network sniffing observes traffic without interacting with it, making it incapable of actively altering or replaying data.

Submitted by zhang_li· Mar 6, 2026Sniffing

Question

When conducting a penetration test, it is crucial to use all means to get all available information about the target network. One of the ways to do that is by sniffing the network. Which of the following cannot be performed by the passive network sniffing?

Options

  • AIdentifying operating systems, services, protocols and devices
  • BModifying and replaying captured network traffic
  • CCollecting unencrypted information about usernames and passwords
  • DCapturing a network traffic for further analysis

How the community answered

(35 responses)
  • A
    9% (3)
  • B
    89% (31)
  • C
    3% (1)

Why each option

Passive network sniffing observes traffic without interacting with it, making it incapable of actively altering or replaying data.

AIdentifying operating systems, services, protocols and devices

Passive sniffing can effectively identify operating systems, services, protocols, and devices by observing the characteristics and patterns of the traffic they generate.

BModifying and replaying captured network trafficCorrect

Passive network sniffing is limited to capturing and analyzing existing network traffic; it lacks the capability to modify packets or replay captured data, as these actions require active interaction with the network.

CCollecting unencrypted information about usernames and passwords

A passive sniffer can readily collect unencrypted information, such as cleartext usernames and passwords, directly from the captured network traffic.

DCapturing a network traffic for further analysis

Capturing network traffic for subsequent analysis is a fundamental and primary function of passive network sniffing tools.

Concept tested: Network sniffing types (passive vs. active) and capabilities

Topics

#Passive sniffing#Network sniffing#Penetration testing

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