CCNP: Building Cisco Multilayer Switched Networks Study Guide (642-811)
Write the answers to the following questions:
| 1. | What command shows you whether a port is in forwarding mode? | |
| 2. | What command would you use to disable spanning tree for VLAN 5 on a set-based switch? | |
| 3. | What command(s) enables spanning tree for VLAN 6 on an IOS-based switch? | |
| 4. | What is a switch's priority by default? | |
| 5. | What is used to determine a bridge ID? | |
| 6. | What is the default hello time of a BPDU? | |
| 7. | What is the amount of time it takes for a switch port to go from blocking state to forwarding state? | |
| 8. | What are the four states of a bridge port? | |
| 9. | What are the two parameters used to determine which port forwards data and which ports block on a switch with redundant links? | |
| 10. | True/False: A bridge must forward all broadcasts out all ports except for the port that initially received the broadcast. | |
Answers
| 1. | show spantree. This command displays the spanning tree information of a VLAN and all the ports' participation in STP. |
| 2. | set spantree disable 5. The set spantree command is used to enable or disable spanning tree for a VLAN. |
| 3. | Terry_2950(config)#spanning-tree vlan 6. This command is used to turn on spanning tree for a VLAN. You can disable STP for an interface with the interface command spanning-tree vlan vlan_number command. |
| 4. | 32768. This is the default priority on all switches and bridges. |
| 5. | Bridge priority and then MAC address. If the priorities of the switches are set the same, the MAC address would be used to determine the root bridge. |
| 6. | 2 seconds. Every 2 seconds, BPDUs are sent out all forwarding ports. |
| 7. | 50 seconds. From blocking to listening is 20 seconds, from listening to learning is 15 seconds, and from learning to forwarding is another 15 seconds. |
| 8. | Blocking, listening, learning, forwarding. Each state is used to stop network loops from occurring on redundant links. |
| 9. | The path cost and port ID are used to determine the designated port and nondesignated ports. |
| 10. | True. Bridges forward all frames that are received and are broadcasts or are not in the filter table. |