CNIT Modules 5-6 Redundant Networks Exam

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

29. What is a requirement to configure a trunking EtherChannel between two switches?

The allowed range of VLANs must be the same on both switches.

32. What are two advantages of EtherChannel? (Choose two.)

Configuring the EtherChannel interface provides consistency in the configuration of the physical links. Spanning Tree Protocol views the physical links in an EtherChannel as one logical connection.

20. Which statement is true regarding the use of PAgP to create EtherChannels?

It is Cisco proprietary.

12. What is a characteristic of spanning tree?

It is enabled by default on Cisco switches.

47. Which statement describes a characteristic of EtherChannel?

It is made by combining multiple physical links that are seen as one link between two switches.

28. Which technology is an open protocol standard that allows switches to automatically bundle physical ports into a single logical link?

LACP

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

MAC address bridge priority extended system ID

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

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.

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.)

PortFast edge port

56. A network administrator has configured an EtherChannel between two switches that are connected via four trunk links. If the physical interface for one of the trunk links changes to a down state, what happens to the EtherChannel?

The EtherChannel will remain functional.

26. A network administrator configured an EtherChannel link with three interfaces between two switches. What is the result if one of the three interfaces is down?

The remaining two interfaces continue to load balance traffic.

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

extended system ID

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

forwarding learning

52. What are two load-balancing methods in the EtherChannel technology? (Choose two.)

source MAC to destination MAC source IP to destination IP

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

45. Which statement describes an EtherChannel implementation?

A trunked port can be part of an EtherChannel bundle.

21. What are two requirements to be able to configure an EtherChannel between two switches? (Choose two.)

All the interfaces need to be working in the same duplex mode. All the interfaces need to work at the same speed.

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.

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

It disables redundant paths to eliminate Layer 2 loops.

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

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

30. What are two advantages of using LACP? (Choose two.)

It allows the use of multivendor devices. It allows directly connected switches to negotiate an EtherChannel link.

49. Which mode configuration setting would allow formation of an EtherChannel link between switches SW1 and SW2 without sending negotiation traffic?

SW1: on SW2: on

27. A network administrator is configuring an EtherChannel link between switches SW1 and SW2 by using the command SW1(config-if-range)# channel-group 1 mode auto . Which command must be used on SW2 to enable this EtherChannel?

SW2(config-if-range)# channel-group 1 mode desirable

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

VLAN ID

23. Which two parameters must match on the ports of two switches to create a PAgP EtherChannel between the switches? (Choose two.)

VLAN information speed

48. Which two channel group modes would place an interface in a negotiating state using PAgP? (Choose two.)

auto desirable

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

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

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

learning forwarding

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

lowest MAC address

51. When EtherChannel is configured, which mode will force an interface into a port channel without exchanging aggregation protocol packets?

on

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

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.)

root designated

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