EtherChannel and Link Aggregation
What is the primary purpose of configuring EtherChannel in a network?
Redundancy
Load balancing
Increased bandwidth
All of the above
Which command is used to create an EtherChannel group on a Cisco switch?
Interface port-channel
Channel-group
Channel-protocol
Etherchannel create
How does LACP (Link Aggregation Control Protocol) improve the configuration of EtherChannel?
It dynamically negotiates channel establishment.
It statically configures channel members.
It ensures a single link is always active.
It prevents loops in the network.
Which of the following is a valid mode for configuring LACP on a switch port?
Active
Passive
Desirable
Both A and B
In a network with multiple VLANs, how can EtherChannel help improve performance?
By providing faster routing between VLANs.
By aggregating multiple VLANs into one.
By increasing the available bandwidth between switches.
By simplifying the VLAN configuration.
Which protocol is used for static link aggregation without any negotiation?
LACP
PAgP
IEEE 802.3ad
Static EtherChannel
What is a key difference between PAgP and LACP?
PAgP is Cisco proprietary, LACP is IEEE standard.
LACP is Cisco proprietary, PAgP is IEEE standard.
PAgP requires manual configuration, LACP is automatic.
LACP only works on Layer 3, PAgP works on Layer 2.
Which command is used to verify the EtherChannel status on a Cisco switch?
Show etherchannel summary
Show port-channel
Show lacp status
Show link-aggregation
What is the main advantage of using EtherChannel over a single link between switches?
Easier management
Higher redundancy and increased bandwidth
Simplified VLAN configuration
Better compatibility with different switch vendors
What happens if one link in an EtherChannel fails?
The entire EtherChannel fails.
The remaining links continue to carry traffic.
The switch shuts down the EtherChannel.
The EtherChannel automatically reconfigures itself.
Which load balancing method can be used with EtherChannel to distribute traffic based on IP addresses?
Source MAC address
Destination MAC address
Source IP address
Destination IP address
How does EtherChannel handle spanning tree protocol (STP) calculations?
It treats the EtherChannel as a single link for STP calculations.
It calculates STP for each individual link.
It disables STP on the aggregated links.
It uses a proprietary protocol for STP calculations.
Which Cisco command is used to add a physical interface to an EtherChannel group?
Interface add
Channel-group
Etherchannel add
Port-channel group
What should be identical on all physical ports before they can be added to an EtherChannel?
VLAN configurations
Port speed and duplex settings
STP settings
All of the above
In which EtherChannel mode does a port only participate in an EtherChannel if the remote end is also configured to participate?
Active
On
Auto
Passive
Which of the following is a benefit of using EtherChannel in a data center environment?
Reduced power consumption
Increased fault tolerance and bandwidth
Simplified VLAN tagging
Easier network monitoring
What issue can arise if EtherChannel ports have different STP path costs?
The EtherChannel may fail to establish.
Traffic may be unevenly distributed.
Loops may occur in the network.
Ports may go into blocking state.
How does EtherChannel improve load balancing?
By using all available links simultaneously.
By selecting the fastest link for each packet.
By sending redundant packets across multiple links.
By splitting traffic based on VLANs.
Which EtherChannel configuration mode on Cisco switches forces the interface to form an EtherChannel without any negotiation?
Active
On
Auto
Desirable
What is the impact of using EtherChannel on network resiliency?
It only impacts resiliency if used with LACP.
It has no impact on network resiliency.
It decreases resiliency due to increased complexity.
It increases resiliency by providing redundant paths.
Which command is used to remove a physical interface from an EtherChannel group on a Cisco switch?
No channel-group
Remove etherchannel
Delete port-channel
No etherchannel
What is the maximum number of physical links that can be bundled into a single EtherChannel on a Cisco switch?
4
6
8
16
Which of the following is a disadvantage of using static EtherChannel configuration?
It requires more CPU resources.
It does not automatically detect link failures.
It is not compatible with other vendors.
It does not support VLAN tagging.
What happens if EtherChannel is configured but one of the physical ports has a different VLAN configuration?
The EtherChannel operates normally.
The EtherChannel goes into an error state.
The EtherChannel uses the default VLAN.
The EtherChannel recalculates VLAN settings.
How can EtherChannel be verified on a Cisco switch?
Using show etherchannel
Using show port-channel
Using show interfaces etherchannel
Using show lacp
Which EtherChannel protocol supports both static and dynamic configuration?
PAgP
LACP
IEEE 802.3ad
LAG
What effect does EtherChannel have on spanning tree convergence time?
It increases convergence time.
It decreases convergence time.
It has no effect on convergence time.
It depends on the number of links in the EtherChannel.
Which of the following is true about EtherChannel load balancing?
It can be configured based on MAC or IP addresses.
It always uses round-robin scheduling.
It only works with LACP.
It cannot be configured manually.
What must be done to an EtherChannel group before adding a new physical interface to it?
The group must be shut down.
The interface must be removed from any other configuration.
The group must be reconfigured.
The switch must be restarted.
Which EtherChannel mode combination will form an EtherChannel if one side is set to active?
Active and Passive
Passive and On
On and Desirable
Desirable and Auto
How does EtherChannel affect link redundancy?
It eliminates the need for redundant links.
It provides redundancy by combining multiple links.
It reduces redundancy by combining links.
It does not impact link redundancy.
Which command is used to configure LACP mode on an interface?
Lacp active
Channel-group active
Lacp mode
Channel-protocol lacp
What is the effect of EtherChannel on network performance?
It reduces overall network performance.
It improves performance by increasing bandwidth.
It has no effect on network performance.
It only improves performance if used with LACP.
Which EtherChannel mode combination will not form an EtherChannel if both sides are set to passive?
Active and Active
Active and Passive
Passive and Passive
On and On
How does EtherChannel handle traffic distribution across links?
It evenly splits packets across all links.
It sends all packets on the fastest link.
It uses a hashing algorithm to distribute packets.
It alternates packets between links.
What happens if you configure different EtherChannel protocols on the two ends of a link?
The switch will choose the default protocol.
The EtherChannel will fail to establish.
The links will operate independently.
The EtherChannel will use the protocol on the first configured switch.
What is a potential issue when adding a new link to an existing EtherChannel?
The new link may cause the EtherChannel to go down temporarily.
The new link will automatically be used without any configuration.
The EtherChannel protocol may need to be changed.
The existing links must be reconfigured.
Which of the following configurations can prevent an EtherChannel from forming?
Different speed and duplex settings on member ports.
Identical VLAN configurations on member ports.
Using the same EtherChannel protocol on both ends.
All member ports in the same STP state.
How can you troubleshoot an EtherChannel that is not forming?
Check the physical cabling.
Verify the EtherChannel configuration on both ends.
Ensure member ports have identical configurations.
All of the above.
What does the show etherchannel port-channel command display?
The status of all EtherChannel groups.
Detailed information about a specific port channel.
The status of LACP negotiations.
The configuration of all EtherChannel groups.
Which command is used to configure a physical interface as part of an EtherChannel group?
Interface etherchannel
Channel-group
Port-channel
Add etherchannel
What is the main purpose of using LACP in an EtherChannel configuration?
To provide redundancy for the links.
To dynamically manage the addition and removal of links.
To increase the speed of the links.
To enable VLAN tagging on the links.
How does EtherChannel improve network efficiency?
By reducing the number of physical connections needed.
By aggregating bandwidth and providing redundancy.
By simplifying network management.
By enabling automatic VLAN assignment.
Which EtherChannel mode should be used if you want to manually configure the links without any dynamic negotiation?
Active
Passive
Auto
On
What is the effect of an EtherChannel misconfiguration?
The EtherChannel will operate with reduced bandwidth.
The EtherChannel may fail to establish or become unstable.
The switch will automatically correct the misconfiguration.
The EtherChannel will use default settings.
Which command provides a detailed summary of all EtherChannels configured on a Cisco switch?
Show port-channel summary
Show interfaces port-channel
Show lacp summary
Show etherchannel summary
What happens if one side of an EtherChannel is configured for LACP and the other side for PAgP?
The EtherChannel will establish but operate with reduced performance.
The EtherChannel will fail to establish.
The switch will choose one protocol to use.
The links will operate independently without aggregation.
Why is it important to ensure consistent VLAN configurations on all ports in an EtherChannel?
To prevent traffic loops.
To ensure proper load balancing.
To avoid EtherChannel misconfiguration errors.
To optimize bandwidth usage.
What is a key benefit of using EtherChannel in a network backbone?
Increased management complexity
Simplified STP configuration
Improved bandwidth and redundancy
Enhanced VLAN management
Which of the following best describes how EtherChannel affects STP (Spanning Tree Protocol)?
Each physical link in the EtherChannel is considered separately by STP.
The EtherChannel is treated as a single link by STP.
STP is disabled on all physical links in the EtherChannel.
EtherChannel has no effect on STP.
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