An in-house penetration tester is using a packet capture device to listen in on network communications. This is an example of:

Passive reconnaissance involves gathering information about a target without directly interacting with it in a way that would be easily detectable. Using a packet capture device to merely listen in on network communications exemplifies this, as it passively collects data without sending probes or actively engaging with systems.

Persistence refers to maintaining access to a compromised system or network over time, which is not the action described by simply listening to traffic.

Escalation of privileges involves gaining higher-level access or permissions within a system, which is distinct from the initial information gathering phase of packet capture.

While a switch might be exploited to facilitate packet capture in some scenarios, simply using a packet capture device to listen in does not inherently imply an exploit against the switch itself.