Question

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?

STP
Rapid PVST+
PVST+
MST

Question

Which three components are combined to form a bridge ID?

Port ID
IP address
Extended system ID
MAC address
Bridge priority
Cost

Question

Match the STP protocol with the correct description.

STP → The legacy 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 enhancement of RSTP to provide a spanning-tree instance for each VLAN

Question

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

blocking
disabled
forwarding
learning
listening

Question

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

lowest IP address
lowest MAC address
highest IP address
highest MAC address

Question

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

static default routes
implementing VLANs to contain broadcasts
redundant links between Layer 2 switches
link-state dynamic routing that provides redundant routes
removing single points of failure with multiple Layer 2 switches

Question

What is the outcome of a Layer 2 broadcast storm?

Routers will take over the forwarding of frames as switches become congested.
New traffic is discarded by the switch because it is unable to be processed.
CSMA/CD will cause each host to continue transmitting frames.
ARP broadcast requests are returned to the transmitting host.

Question

Match the spanning-tree feature with the protocol type.

PVST → Cisco implementation of IEEE 802.1D
RSTP → Fast converging enhancement of IEEE 802.1D
MSTP → IEEE standard that reduces the number of STP instances
MST → Proprietary per VLAN implementation of IEEE 802.1w
Rapid PVST+ → An evolution of STP that provides faster convergence

Question

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.)

disabled
designated
root
alternate
blocked

Question

The graphic contains three switches, S1, S2, and S3. Each switch is connected to the other two through two links that use the Fa0/1, Fa0/2, Fa0/3, and Fa0/4 interfaces. Below the diagram is CLI output that shows the following: S1(config)# interface range fa0/1 – 4 S1(config-if-range)# channel-group 1 mode on

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 can only be sent to two different switches if EtherChannel is implemented on Gigabit Ethernet interfaces.
Traffic can only be sent to two different switches if EtherChannel is implemented on Layer 3 switches.
Traffic cannot be sent to two different switches through the same EtherChannel link.
Traffic cannot be sent to two different switches, but only to two different devices like an EtherChannel-enabled server and a switch.

Question

The graphic contains two switches, S1 and S2, that are connected through two links that use the Fa0/0 and Fa0/1 interfaces.

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?

on
auto
desirable
off

Question

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 interface port-channel number has to be different on each switch.
The switch ports were not configured with speed and duplex mode.
The switch ports have to be configured as access ports with each port having a VLAN assigned.
The EtherChannel was not configured with the same allowed range of VLANs on each interface.

Question

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

the highest MAC address of all the ports in the switch
the lowest MAC address of all the ports in the switch
the VTP revision number
the path cost

Question

The graphic shows a Layer 3 switch at the top. The Layer 3 switch connects to three Layer 2 switches with two links between the Layer 3 switch and each of the Layer 2 switches.

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?

HSRP
PortFast
Trunking
EtherChannel

Question

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

SW1: on
SW2: on
SW1: desirable
SW2: desirable
SW1: auto
SW2: auto
Trunking enabled on both switches
SW1: auto
SW2: auto
PortFast enabled on both switches
SW1: passive
SW2: active

Question

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

It requires full duplex.
It is Cisco proprietary.
It requires more physical links than LACP does.
It increases the number of ports that are participating in spanning tree.
It mandates that an even number of ports (2, 4, 6, etc.) be used for aggregation.

Question

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

The interfaces that are involved need to be contiguous on the switch.
All the interfaces need to work at the same speed.
All the interfaces need to be working in the same duplex mode.
All interfaces need to be assigned to different VLANs.
Different allowed ranges of VLANs must exist on each end.

Question

Refer to the exhibit. On the basis of the output that is shown, what can be determined about the EtherChannel bundle?

The EtherChannel bundle is down.
The EtherChannel bundle is operating at both Layer 2 and Layer 3.
Two Gigabit Ethernet ports are used to form the EtherChannel.
A Cisco proprietary protocol was used to negotiate the EtherChannel link.

Question

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

root port
non-designated port
designated port
disabled port

Question

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

MAC address
Speed
VLAN information
PAgP mode
Port ID

Question

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?

4096
32768
61440
65535

Question

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

combination of source port and IP to destination port and IP
source IP to destination IP
source port to destination port
combination of source MAC and IP to destination MAC and IP
source MAC to destination MAC

Question

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

Multilink PPP
DTP
LACP
PAgP

Question

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

active
auto
on
desirable

Question

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

on
desirable
active
auto
passive

Question

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 transition to a down state.
Spanning Tree Protocol will recalculate the remaining trunk links.
The EtherChannel will remain functional.
Spanning Tree Protocol will transition the failed physical interface into forwarding mode.

Question

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

Configuring the EtherChannel interface provides consistency in the configuration of the physical links.
Load balancing occurs between links configured as different EtherChannels.
EtherChannel uses upgraded physical links to provide increased bandwidth.
Spanning Tree Protocol views the physical links in an EtherChannel as one logical connection.
Spanning Tree Protocol ensures redundancy by transitioning failed interfaces in an EtherChannel to a forwarding state.

Question

The graphic shows the following information: Switch S1 (the root bridge) uses a port that is labeled B to connect to switch S3 on a port labeled D. S3 is connected to switch S2 on a port labeled A. S2 uses a port labeled C to connect to S1. S2 is connected also to three PC workstations labeled A, B, and C.

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

alternate, root, designated, root
designated, root, alternate, root
alternate, designated, root, root
designated, alternate, root, root

Question

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?

1
28672
32768
34816
61440

Question

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

S1
S2
S3
S4

Question

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.
The EtherChannel is established without negotiation.
The EtherChannel is established after SW1 initiates the link request.
The EtherChannel is established after SW2 initiates the link request.

Question

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 SW1 EtherChannel mode to on.
Configure SW2 EtherChannel mode to on.
Configure SW2 EtherChannel mode to auto.
Configure SW2 EtherChannel mode to desirable.

Question

What is the function of STP in a scalable network?

It decreases the size of the failure domain to contain the impact of failures.
It protects the edge of the enterprise network from malicious activity.
It disables redundant paths to eliminate Layer 2 loops.
It combines multiple switch trunk links to act as one logical link for increased bandwidth.

Question

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

The switch acts like a hub.
Port security becomes unstable.
The MAC address table becomes unstable.
Broadcast frames are transmitted indefinitely.
Port security shuts down all of the ports that have attached devices.

Question

What is a characteristic of spanning tree?

It is enabled by default on Cisco switches.
It has a TTL mechanism that works at Layer 2.
It prevents propagation of Layer 2 broadcast frames.
It is used to discover information about an adjacent Cisco device.

Question

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 EtherChannel fails.
The remaining two interfaces continue to load balance traffic.
The remaining two interfaces become separate links between the two switches.
One interface becomes an active link for data traffic and the other becomes a backup link.

Question

Which statement describes a characteristic of EtherChannel?

It can combine up to a maximum of 4 physical links.
It can bundle mixed types of 100 Mb/s and 1Gb/s Ethernet links.
It consists of multiple parallel links between a switch and a router.
It is made by combining multiple physical links that are seen as one link between two switches.

Question

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

Question

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

The participating interfaces must be physically contiguous on a switch.
The allowed range of VLANs must be the same on both switches.
The participating interfaces must be on the same module on a switch.
The participating interfaces must be assigned the same VLAN number on both switches.

Question

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 suspended.
The EtherChannel is not functional.
The port aggregation protocol PAgP is misconfigured.
FastEthernet ports Fa0/1, Fa0/2, and Fa0/3 do not join the EtherChannel.

Question

Which statement describes an EtherChannel implementation?

EtherChannel operates only at Layer 2.
PAgP cannot be used in conjunction with EtherChannel.
A trunked port can be part of an EtherChannel bundle.
EtherChannel can support up to a maximum of ten separate links.

Question

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

Rapid PVST
802.1D
MST
PVST+

Question

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

prevents Layer 2 loops
prevents routing loops on a router
creates smaller collision domains
creates smaller broadcast domains
allows Cisco devices to exchange routing table updates

Question

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

forwarding
disabled
learning
listening
blocking

Question

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

LACP allows Fast Ethernet and Gigabit Ethernet interfaces to be mixed within a single EtherChannel.
It eliminates the need for configuring trunk interfaces when deploying VLANs on multiple switches.
It allows directly connected switches to negotiate an EtherChannel link.
It provides a simulated environment for testing link aggregation.
It decreases the amount of configuration that is needed on a switch.
It allows the use of multivendor devices.

Question

PT Activity

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 Port-channel 1,no shutdown
interface GigabitEthernet0/1,channel-group 1 mode desirable
interface GigabitEthernet0/1,no shutdown
interface GigabitEthernet0/2,channel-group 2 mode desirable

Question

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
BPDUs
Bridge ID
Extended system ID

Question

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

root bridge
root port
designated port
alternate port

Question

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

Extended system ID
Port ID
MAC Address
Bridge priority

Question

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
designated port
alternate port
disabled

Question

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
designated port
alternate port
root bridge

Question

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

root bridge
root port
designated port
disabled

Question

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
alternate port
disabled
root port

Question

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
alternate port
disabled
dedicated port

Question

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

Extended system ID
Port ID
Bridge priority
Bridge ID

Question

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
MAC Address
Extended system ID
Bridge ID