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If you are connected to a switch, the only traffic that is sent to your laptop is broadcast and laptop's MAC address. The traffic between hosts 2 and 3 can be captured in a few ways: mirror/span port, TAP on either host 2 or 3, or a hub.

If you are connected to a switch, the only traffic that is sent to your laptop is broadcast and laptop's MAC address. A switch is different from a hub, it only forwards traffic to all ports when it doesn't have entry for the destination MAC in its table. The traffic between hosts 2 and 3 can be captured in a few ways: mirror/span port, TAP on either host 2 or 3, or a hub. hub.