What attack involves connecting a rogue switch to change the operation of STP and sniff traffic?

• A. STP
• B. Switch Spoofing
• C. VLAN hopping
• D. Spanning Tree Protocol (STP) attack

Answer: (D)

This is about manipulating how the network learns its topology using Spanning Tree Protocol. In a switched network, STP runs to prevent loops by electing a root bridge and then calculating the best paths to that root. Devices exchange BPDU frames to decide which switch should be the root and which ports should forward traffic. A rogue switch connected to the network can start sending BPDUs with a superior Bridge ID (for example, a lower priority or a different MAC that makes it appear more authoritative). If neighboring switches accept this, the rogue device can become the root bridge or force some links to forward through it. As a result, traffic from other devices gets redirected through the attacker’s switch, allowing the attacker to sniff passing frames and potentially intercept or manipulate data. That specific exploitation of STP’s root-election mechanism to redirect traffic is what makes this a Spanning Tree Protocol attack.

(Other options describe related concepts but don’t target STP in this way to intercept traffic: one refers to the protocol itself without the attack aspect, another to spoofing a switch identity in a different context, and another to VLAN hopping, which exploits VLAN configurations rather than STP topology changes. )