Drag the port states to their correct description.
Answer: 
Explanation:
After the bridges have determined which ports are Root Ports, Designated Ports, and nonDesignated Ports, STP is ready to create a loop-free topology. To do this, STP configures
Root Ports and Designated Ports to forward traffic. STP sets non-Designated Ports to block
traffic. Although Forwarding and Blocking are the only two states commonly seen in a stable
network, there are actually five STP states.
This list can be viewed hierarchically in that bridge ports start at the Blocking state and work
their way up to the Forwarding state. The Disabled state is the administratively shutdown
STP state. It is not part of the normal STP port processing. After the switch is initialized,
ports start in the Blocking state. The Blocking state is the STP state in which a bridge listens for BPDUs.
A port in the Blocking state does the following:
+ Discards frames received from the attached segment or internally forwarded through switching
+ Receives BPDUs and directs them to the system module
+ Has no address database
+ Does not transmit BPDUs received from the system module
+ Receives and responds to network management messages but does not transmit them
If a bridge thinks it is the Root Bridge immediately after booting or in the absence of BPDUs
for a certain period of time, the port transitions into the Listening state. The Listening state is
the STP state in which no user data is being passed, but the port is sending and receiving
BPDUs in an effort to determine the active topology.
A port in the Listening state does the following:
+ Discards frames received from the attached segment or frames switched from another port
+ Has no address database
+ Receives BPDUs and directs them to the system module+ Processes BPDUs received from the system module (Processing BPDUs is a separate
action from receiving or transmitting BPDUs)
+ Receives and responds to network management messages
It is during the Listening state that the three initial convergence steps take place – elect a
Root Bridge, elect Root Ports, and elect Designated Ports. Ports that lose the Designated
Port election become non-Designated Ports and drop back to the Blocking state. Ports that
remain Designated Ports or Root Ports after 15 seconds – the default Forward Delay STP
timer value – progress into the Learning state. The lifetime of the Learning state is also
governed by the Forward Delay timer of 15 seconds, the default setting.
The Learning state is the STP state in which the bridge is not passing user data frames but
is building the bridging table and gathering information, such as the source VLANs of data
frames. As the bridge receives a frame, it places the source MAC address and port into the
bridging table. The Learning state reduces the amount of flooding required when data
forwarding begins.
A port in the Learning state does the following:
Discards frames received from the attached segment
Discards frames switched from another port for forwarding
Incorporates station location into its address database
Receives BPDUs and directs them to the system module
Receives, processes, and transmits BPDUs received from the system module
Receives and responds to network management messages
If a port is still a Designated Port or Root Port after the Forward Delay timer expires for the
Learning state, the port transitions into the Forwarding state. The Forwarding state is the
STP state in which data traffic is both sent and received on a port. It is the “last” STP state.
At this stage, it finally starts forwarding user data frames.
A port in the Forwarding state does the following:
Forwards frames received from the attached segment
Forwards frames switched from another port for forwarding
Incorporates station location information into its address database
Receives BPDUs and directs them to the system module
Processes BPDUs received from the system module
Receives and responds to network management messages
Reference:
CCNP BCMSN Official Exam Certification Guide, Fourth Edition, Chapter 8: Traditional
Spanning Tree Protocol, IEEE 802.1D Overview, p. 197