probe

2) A probe is a program or other device inserted at a key juncture in a network for the purpose of monitoring or collecting data about network activity.

3) Relative to computer security in a network, a probe is an attempt to gain access to a computer and its files through a known or probable weak point in the computer system.

4) In semiconductor testing, a probe card is a microchip placed in a circuit in order to test its signals.

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