CCNA 2 v7 Modules 5 - 6: Redundant Networks
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
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
Which spanning tree standard supports only one root bridge so that traffic from all VLANs flows over the same path?
802.1D
Refer to the exhibit. On the basis of the output that is shown, what can be determined about the EtherChannel bundle?
A Cisco proprietary protocol was used to negotiate the EtherChannel link.
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
What is the outcome of a Layer 2 broadcast storm?
New traffic is discarded by the switch because it is unable to be processed.*
Refer to the exhibit. Which switch will be the root bridge after the election process is complete?
S2
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
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
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
Which two channel group modes would place an interface in a negotiating state using PAgP? (Choose two.)
desirable auto
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
A switch is configured to run STP. What term describes a field used to specify a VLAN ID?
extended system ID
Which three components are combined to form a bridge ID?
extended system ID bridge priority MAC address
In which two port states does a switch learn MAC addresses and process BPDUs in a PVST network? (Choose two.)
forwarding learning
Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.Which set of configuration commands issued on SW1 will successfully complete the EtherChannel link between SW1 and SW2?
interface GigabitEthernet0/1 channel-group 1 mode desirable
In which two PVST+ port states are MAC addresses learned? (Choose two.)
learning forwarding
If no bridge priority is configured in PVST, which criteria is considered when electing the root bridge?
lowest MAC address
When EtherChannel is configured, which mode will force an interface into a port channel without exchanging aggregation protocol packets?
on
What is the purpose of the Spanning Tree Protocol (STP)?
prevents Layer 2 loops
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
A switch is configured to run STP. What term describes the reference point for all path calculations?
root bridge
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
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
Which port role is assigned to the switch port that has the lowest cost to reach the root bridge?
root port
What are two load-balancing methods in the EtherChannel technology? (Choose two.)
source IP to destination IP source MAC to destination MAC
Which two parameters must match on the ports of two switches to create a PAgP EtherChannel between the switches? (Choose two.)
speed VLAN information
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
Which technology is an open protocol standard that allows switches to automatically bundle physical ports into a single logical link?
LACP
Which statement describes an EtherChannel implementation?
A trunked port can be part of an EtherChannel bundle.
What are two requirements to be able to configure an EtherChannel between two switches? (Choose two.)
All the interfaces need to work at the same speed. All the interfaces need to be working in the same duplex mode.
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.
Refer to the exhibit. A network administrator is configuring an EtherChannel link between two switches, SW1 and SW2. However, the EtherChannel link fails to establish. What change in configuration would correct the problem?
Configure SW2 EtherChannel mode to desirable.
Refer to the exhibit. Which switching technology would allow each access layer switch link to be aggregated to provide more bandwidth between each Layer 2 switch and the Layer 3 switch?
EtherChannel
What are two advantages of using LACP? (Choose two.)
It allows directly connected switches to negotiate an EtherChannel link. It allows the use of multivendor devices.
What is the function of STP in a scalable network?
It disables redundant paths to eliminate Layer 2 loops.
Which statement is true regarding the use of PAgP to create EtherChannels?
It is Cisco proprietary.
What is a characteristic of spanning tree?
It is enabled by default on Cisco switches.
Which statement describes a characteristic of EtherChannel?
It is made by combining multiple physical links that are seen as one link between two switches.
Which mode configuration setting would allow formation of an EtherChannel link between switches SW1 and SW2 without sending negotiation traffic?
SW1: onSW2: on
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
What are two advantages of EtherChannel? (Choose two.)
Spanning Tree Protocol views the physical links in an EtherChannel as one logical connection. Configuring the EtherChannel interface provides consistency in the configuration of the physical links.
Refer to the exhibit. A network administrator is configuring an EtherChannel link between two switches, SW1 and SW2. Which statement describes the effect after the commands are issued on SW1 and SW2?
The EtherChannel fails to establish.
Refer to the exhibit. A network administrator issued the show etherchannel summary command on the switch S1. What conclusion can be drawn?
The EtherChannel is not functional.
Refer to the exhibit. An EtherChannel was configured between switches S1 and S2, but the interfaces do not form an EtherChannel. What is the problem?
The EtherChannel was not configured with the same allowed range of VLANs on each interface.
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.
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.
What is a requirement to configure a trunking EtherChannel between two switches?
The allowed range of VLANs must be the same on both switches.
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.
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.
What additional information is contained in the 12-bit extended system ID of a BPDU?
VLAN ID
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
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
