mod 5 STP

18. A small company network has six interconnected Layer 2 switches. Currently all switches are using the default bridge priority value. Which value can be used to configure the bridge priority of one of the switches to ensure that it becomes the root bridge in this design?

28672

37. A set of switches is being connected in a LAN topology. Which STP bridge priority value will make it least likely for the switch to be selected as the root?

61440

13. Which spanning tree standard supports only one root bridge so that traffic from all VLANs flows over the same path?

802.1D

2. During the implementation of Spanning Tree Protocol, all switches are rebooted by the network administrator. What is the first step of the spanning-tree election process?

All the switches send out BPDUs advertising themselves as the root bridge.

5. During the implementation of Spanning Tree Protocol, all switches are rebooted by the network administrator. What is the first step of the spanning-tree election process?

All the switches send out BPDUs advertising themselves as the root bridge.

2. After the election of the root bridge has been completed, how will switches find the best paths to the root bridge?

Each switch will analyze the sum of all port costs to reach the root and use the path with the lowest cost.

11. What is the function of STP in a scalable network?

It disables redundant paths to eliminate Layer 2 loops.

12. What is a characteristic of spanning tree?

It is enabled by default on Cisco switches.

4. What value determines the root bridge when all switches connected by trunk links have default STP configurations?

MAC address

53. Which protocol provides up to 16 instances of RSTP, combines many VLANs with the same physical and logical topology into a common RSTP instance, and provides support for PortFast, BPDU guard, BPDU filter, root guard, and loop guard?

MST

11. What is one way to correct a spanning tree failure?

Manually remove redundant links in the switched network.

54. What is the outcome of a Layer 2 broadcast storm?

New traffic is discarded by the switch because it is unable to be processed.

3. Which is the default STP operation mode on Cisco Catalyst switches?

PVST+

9. Match the spanning-tree feature with the protocol type. (Not all options are used.)

PVST+ - cisco implementation of IEEE 802.D Rapid PVST+ Proprientary per vlan inplementation of IEEE 802.1w RSTP- fast converging enhancement of IEEE 802.1D MSTP- Standard that reduces the number of STP

6. Which two concepts relate to a switch port that is intended to have only end devices attached and intended never to be used to connect to another switch? (Choose two.)

PortFast edge port

9. Which STP port role is adopted by a switch port if there is no other port with a lower cost to the root bridge?

Root port

16. Refer to the exhibit. Which switch will be the root bridge after the election process is complete?

S2

6. Match the STP protocol with the correct description. (Not all options are used.)

STP- the lagacy standard for STP that runs all vlans in a single spanning-tree instance MSTP- a protocol that allows multiple VLans to run in a single spanning-tree instance Rapid PVST+ - a cisco inhanced of RSTP to provide a spanning-tree instance for each vlan

1. What additional information is contained in the 12-bit extended system ID of a BPDU?

VLAN ID

33. Refer to the exhibit. What are the possible port roles for ports A, B, C, and D in this RSTP-enabled network?

alternate, designated, root, root

44. A switch is configured to run STP. What term describes a field that has a default value of 32,768 and is the initial deciding factor when electing a root bridge?

bridge priority

10. When the show spanning-tree vlan 33 command is issued on a switch, three ports are shown in the forwarding state. In which two port roles could these interfaces function while in the forwarding state? (Choose two.)

designated root

31. A switch is configured to run STP. What term describes a non-root port that is permitted to forward traffic on the network?

designated port

14. What is an accurate description of redundancy?

designing a network to use multiple paths between switches to ensure there is no single point of failure

35. Refer to the exhibit. An administrator wants to form an EtherChannel between the two switches by using the Port Aggregation Protocol. If switch S1 is configured to be in auto mode, which mode should be configured on S2 to form the EtherChannel?

desirable

4. Which two concepts relate to a switch port that is intended to have only end devices attached and intended never to be used to connect to another switch? (Choose two.)

edge port PortFast

42. A switch is configured to run STP. What term describes a field used to specify a VLAN ID?

extended system ID

5. Which three components are combined to form a bridge ID?

extended system ID bridge priority MAC address

1. Which port state will switch ports immediately transition to when configured for PortFast?

forwarding

8. When PVST is running over a switched network, which port state can participate in BPDU frame forwarding based on BPDUs received, but does not forward data frames?

listening

13. An administrator is troubleshooting a switch and wants to verify if it is a root bridge. What command can be used to do this?

show spanning-tree

15. What is the value used to determine which port on a non-root bridge will become a root port in a STP network?

the path cost

17. What are two drawbacks to turning spanning tree off and having multiple paths through the Layer 2 switch network? (Choose two.)

The MAC address table becomes unstable. Broadcast frames are transmitted indefinitely.

10. Which two statements describe a switch port that is configured with PortFast? (Choose two.)

The switch port immediately transitions from blocking to the forwarding state. The switch port should never receive BPDUs.

19. Refer to the exhibit. The administrator tried to create an EtherChannel between S1 and the other two switches via the commands that are shown, but was unsuccessful. What is the problem?

Traffic cannot be sent to two different switches through the same EtherChannel link.

12. What additional information is contained in the 12-bit extended system ID of a BPDU?

VLAN ID

38. In which two PVST+ port states are MAC addresses learned? (Choose two.)

forwarding learning

7. In which two port states does a switch learn MAC addresses and process BPDUs in a PVST network? (Choose two.)

forwarding learning

7. Which three port states are used by Rapid PVST+? (Choose three.)

learning forwarding discarding

8. If no bridge priority is configured in PVST, which criteria is considered when electing the root bridge?

lowest MAC address

14. What is the purpose of the Spanning Tree Protocol (STP)?

prevents Layer 2 loops

55. Which two network design features require Spanning Tree Protocol (STP) to ensure correct network operation? (Choose two.)

redundant links between Layer 2 switches removing single points of failure with multiple Layer 2 switches

43. A switch is configured to run STP. What term describes the reference point for all path calculations?

root bridge

3. Which STP port role is adopted by a switch port if there is no other port with a lower cost to the root bridge?

root port

39. Which port role is assigned to the switch port that has the lowest cost to reach the root bridge?

root port

40. A switch is configured to run STP. What term describes the switch port closest, in terms of overall cost, to the root bridge?

root port