Could an attacker remain connected to the network?¶

Yes. Removing one suspicious device or session may leave other routes active, including compromised accounts, VPN tokens, remote-management tools, malware, wireless access or another host inside the network.

Access can be distributed and persistent¶

An intrusion need not depend on a single connection. An operator may have several sessions, while automated malware can reconnect after interruption or use a separate command channel. Stolen credentials and cloud sessions may remain valid even after a cable is unplugged. Conversely, an unfamiliar session may belong to an administrator, service provider or legitimate remote worker.

Preserve visible sessions, connected devices, remote-access tools, VPN records, unusual accounts, alerts and network connections. Useful fields include addresses, ports, times, device names, account identifiers and session IDs. Changes after first observation - such as new alerts, cursor movement or disappearing sessions - should also be timed and recorded.

Containment needs a coordinated view¶

Unstructured searching can alter volatile evidence, expose the response or trigger destructive behaviour. Where access may be continuing, network and incident-response specialists should coordinate containment across devices, identities, cloud services and remote-management paths.

If immediate harm demands action, use the narrowest effective measure and record the original state when time permits. A technical link to an account or device supports investigation, but does not by itself identify the human operator.