Spanning Tree Protocol problems
- 1. You want to run the new 802.1w on your switches. Which of the following would enable this protocol?
Options- A. Switch(config)# spanning-tree mode rapid-pvst
- B. Switch# spanning-tree mode rapid-pvst
- C. Switch(config)# spanning-tree mode 802.1w
- D. Switch# spanning-tree mode 802.1w Discuss
Correct Answer: Switch(config)# spanning-tree mode rapid-pvst
Explanation:
802.1w is the also called Rapid Spanning Tree Protocol. It is not enabled by default on Cisco switches, but it is a better STP to run since it has all the fixes that the Cisco extensions provide with 802.1d.
- 2. Which statement describes a spanning-tree network that has converged?
Options- A. All switch and bridge ports are in the forwarding state.
- B. All switch and bridge ports are assigned as either root or designated ports.
- C. All switch and bridge ports are in either the forwarding or blocking state.
- D. All switch and bridge ports are either blocking or looping. Discuss
Correct Answer: All switch and bridge ports are in either the forwarding or blocking state.
Explanation:
Convergence occurs when all ports on bridges and switches have transitioned to either the forwarding or blocking states. No data is forwarded until convergence is complete. Before data can be forwarded again, all devices must be updated.
- 3. What is the purpose of Spanning Tree Protocol in a switched LAN?
Options- A. To provide a mechanism for network monitoring in switched environments
- B. To prevent routing loops in networks with redundant paths
- C. To prevent switching loops in networks with redundant switched paths
- D. To manage the VLAN database across multiple switches
- E. To create collision domains Discuss
Correct Answer: To prevent switching loops in networks with redundant switched paths
Explanation:
The Spanning Tree Protocol (STP) was designed to stop layer 2 loops. All Cisco switches have the STP on by default.
- 4. Your switch has a port status LED that is alternating between green and amber. What could this indicate?
Options- A. The port is experiencing errors.
- B. The port is shut down.
- C. The port is in STP blocking mode.
- D. Nothing; this is normal. Discuss
Correct Answer: The port is experiencing errors.
Explanation:
When you connect to a switch port, at first the link lights are orange/amber, and then they turn green, indicating normal operation. If the link light is blinking, you have a problem.
- 5. If you want to disable STP on a port connected to a server, which command would you use?
Options- A. disable spanning-tree
- B. spanning-tree off
- C. spanning-tree security
- D. spanning-tree portfast Discuss
Correct Answer: spanning-tree portfast
Explanation:
If you have a server or other devices connected into your switch that you're totally sure won't create a switching loop if STP is disabled, you can use something called
portfast on these ports. Using it means the port won't spend the usual 50 seconds to come up while STP is converging.
- 6. What does a switch do when a frame is received on an interface and the destination hardware address is unknown or not in the filter table?
Options- A. Forwards the switch to the first available link
- B. Drops the frame
- C. Floods the network with the frame looking for the device
- D. Sends back a message to the originating station asking for a name resolution Discuss
Correct Answer: Floods the network with the frame looking for the device
Explanation:
Switches flood all frames that have an unknown destination address. If a device answers the frame, the switch will update the MAC address table to reflect the location of the device.
Programming
Copyright ©CuriousTab. All rights reserved.