CompTIA Network+ Practice Test

What is a characteristic of the Learning state in STP?

1. Data is passed through without interruption

2. MAC addresses are added to the MAC table

3. Ports are disabled for maintenance

4. Packets are forwarded to the root bridge

The correct answer is: MAC addresses are added to the MAC table

In the Spanning Tree Protocol (STP), the Learning state is a critical phase in the transition of switch ports as they determine the network topology. During the Learning state, the switch does not forward any data packets. Instead, it focuses on identifying and recording the MAC addresses of devices connected to the network. As the switch receives frames, it adds the source MAC addresses of the incoming frames to its MAC address table. This allows the switch to build a database of the devices in the network, which is essential for efficient packet forwarding once the port transitions to the Forwarding state. The other options describe actions or states that don't accurately represent the Learning phase. For instance, data passing through without interruption pertains more to the Forwarding state. Disabling ports for maintenance typically refers to the Blocking state or administrative actions, while forwarding packets to the root bridge again aligns with behaviors seen in the Forwarding state. Thus, the emphasis in the Learning state on populating the MAC address table is what makes this characteristic particularly significant.