Cisco Enterprise Network Core Technologies (ENCOR) Practice Exam

Question: 1 / 400

How many types of BPDUs are defined in 802.1D and 802.1W?

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In the context of the IEEE 802.1D and 802.1W standards, there are indeed two types of Bridge Protocol Data Units (BPDUs) defined. One type is known as the Configuration BPDU, which is used primarily in the Spanning Tree Protocol (STP) for topology management and ensuring loop-free networks. These BPDUs contain information about the root bridge and the path cost to reach the root.

The second type is the Topology Change Notification (TCN) BPDU, which is used to notify the network about topology changes, such as when a switch port transitions through the listening and learning states. This is essential for dynamically managing changes in the network topology to maintain a loop-free environment.

This distinction between the two types of BPDUs provides the necessary framework for both cell formation and change notifications, ensuring efficient operation and adaptability in a network environment that follows these standards.

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