COMBO Modules 5 & 6 Study Guide

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 statement describes an EtherChannel implementation?

A trunked port can be part of an EtherChannel bundle

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 statement best describes STP?

STP is a Layer 2 loop prevention protocol for Ethernet LANS.

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

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

discarding learning forwarding

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

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

It is Cisco proprietary

Which three STP port states are merged into the RSTP discarding port state? (Choose three.)

disabled blocking listening

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

How often does a switch send a BPDU?

every 2 seconds

The root bridge will be the switch with the:

lowest bridge id

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

Forwarding

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

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.

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

PVST+

What are two advantages of using LACP?

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

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

LACP

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

On

Which technology solves the problem of a device being unable to get an IPv4 address from a DHCP server due to STP forwarding delay timers?

Portfast

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.

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

The port on the segment (with two switches) that has the lowest path cost to the root bridge is the

designated port

Which of the following ports will forward Ethernet frames? (Choose two.)

designated port root 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

By default (without any configuration on a switch), what will determine which switch is the root bridge?

the mac address on the switch

Without STP on the Ethernet LAN, which three types of frames could cause a catastrophic loop in the network? (Choose three.)

unknown unicast multicast broadcast

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

vlan id

What are two requirements to be able to configure an EtherChannel between two switches?

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

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.

What are two advantages of EtherChannel?

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.

Which two channel group modes would place an interface in a negotiating state using PAgP

Desirable Auto

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

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

What is one way to correct a spanning tree failure?

Manually remove redundant links in the switched network.

Which protocol was designed to bring faster convergence to STP?

Rstp

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

SW1: ON SW2:ON

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

Speed VLAN Information

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 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

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

mac address

What device is elected by the Spanning Tree Algorithm to which all other switches determine a single least-cost path?

root bridge

The sum of individual port costs along the path from the switch to the root bridge is known as the:

root path cost

The port closest to the root bridge in terms of least overall cost (best path) to the root bridge is the:

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

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

What are two load-balancing methods in the EtherChannel technology?

source IP to destination IP source MAC to destination MAC