EtherChannel
Which command verifies the EtherChannel configuration on a Cisco switch?
Show etherchannel summary
Show port-channel
Show interface
Show switchport summary
What is the maximum number of physical interfaces that can be bundled in a single EtherChannel?
4
8
16
24
Which EtherChannel mode will place an interface into a negotiation state to form an EtherChannel only if it receives PAgP packets?
On
Desirable
Auto
Active
Which protocol can be used to form an EtherChannel with switches from different vendors?
PAgP
LACP
DTP
STP
If you configure a switch port to be part of an EtherChannel but it remains in a standalone state, what could be a possible cause?
Speed mismatch
MTU mismatch
Duplex mismatch
Any of the above
Which command configures a Layer 2 EtherChannel using LACP?
Channel-group 1 mode on
Channel-group 1 mode auto
Channel-group 1 mode active
Channel-group 1 mode passive
How does EtherChannel provide redundancy?
By using multiple spanning-tree instances
By bundling multiple physical links into a single logical link
By using dynamic routing protocols
By enabling fast convergence
Which command shows detailed EtherChannel information including protocol and port status?
Show port-channel
Show etherchannel detail
Show etherchannel port
Show interface etherchannel
What happens if one of the physical links in an EtherChannel fails?
The entire EtherChannel goes down
Traffic is redistributed over the remaining links
The EtherChannel switches to backup mode
The failed link is replaced automatically
Which EtherChannel mode pairs with "auto" to successfully form an EtherChannel using PAgP?
On
Desirable
Passive
Active
You have an EtherChannel configured with mode on on both sides, but the ports are not bundling. What could be the reason?
Incompatible EtherChannel protocol
Different VLANs on the ports
Speed and duplex mismatch
All of the above
Which of the following is not a benefit of using EtherChannel?
Increased bandwidth
Redundancy
Simplified configuration of Layer 3 protocols
Load balancing
What is the effect of enabling LACP Fast on a switch port?
Decreases the negotiation time for LACP
Increases the number of available EtherChannels
Speeds up EtherChannel convergence
Prioritizes traffic over EtherChannel
Which load-balancing method uses both the source and destination IP addresses to distribute traffic across the EtherChannel links?
Src-mac
Dst-mac
Src-dst-ip
Src-dst-mac
Which of the following is a valid reason for an EtherChannel to remain in a “standalone” state despite proper configuration?
Different switch models
Mismatched port settings
Different firmware versions
Unsupported cable types
What command would you use to set a physical interface to be part of an EtherChannel using LACP in active mode?
Interface port-channel 1
Channel-group 1 mode active
Channel-protocol lacp
Lacp mode active
Which EtherChannel mode pairs with "passive" to successfully form an EtherChannel using LACP?
On
Desirable
Passive
Active
What happens to the EtherChannel if you change the VLAN configuration on one of the member ports?
The EtherChannel is unaffected
The EtherChannel goes down
The member port is suspended
The switch resets the EtherChannel
What is the purpose of the channel-protocol command?
To specify the protocol used for EtherChannel
To configure the speed and duplex settings
To define the load-balancing method
To enable the EtherChannel
When configuring EtherChannel on a trunk link, which parameter must be identical on all ports?
VLAN
Speed
Trunk encapsulation
Duplex
What command would you use to assign a port to EtherChannel group 2 in PAgP desirable mode?
Channel-group 2 mode auto
Channel-group 2 mode desirable
Channel-group 2 mode active
Channel-group 2 mode passive
If an EtherChannel is configured but not operational, which command can help identify the issue?
Show interfaces switchport
Show etherchannel load-balance
Show etherchannel summary
Show spanning-tree
In LACP, what does it mean if an interface is in the “Collecting/Distributing” state?
It is not actively participating in the EtherChannel
It is actively participating and forwarding traffic
It is in negotiation mode
It is in standby mode
Which command verifies the load-balancing method used by EtherChannel?
Show etherchannel load-balance
Show etherchannel summary
Show interface port-channel
Show spanning-tree
What will happen if you configure an EtherChannel with ports that have different trunking modes?
The EtherChannel will form successfully
Only the ports with matching trunking modes will bundle
The EtherChannel will fail to form
The switch will automatically correct the trunking mode
How does LACP prevent loops when one side of the EtherChannel is down?
By using STP
By using LACPDU packets
By disabling the affected port
By reducing the bandwidth
Which command would you use to configure a Layer 3 EtherChannel interface?
Interface etherchannel 1 mode on
Interface channel-group 1
Interface etherchannel 1
Interface port-channel 1
What is the main advantage of using LACP over PAgP for EtherChannel formation?
LACP is faster
LACP supports more interfaces
LACP is an industry standard
LACP is more secure
How does EtherChannel handle traffic if all member links have the same speed and duplex settings?
It uses the fastest link
It aggregates the bandwidth of all links
It load balances based on the configured method
It selects a random link for each flow
What effect does configuring EtherChannel on switches with different iOS versions have?
No effect
EtherChannel fails to form
Performance degradation
Traffic loss
Which command is used to set the load-balancing method to source and destination IP addresses?
Port-channel load-balance src-ip
Port-channel load-balance dst-ip
Port-channel load-balance src-dst-ip
Port-channel load-balance src-dst-mac
What is a key difference between Layer 2 and Layer 3 EtherChannel?
Layer 2 uses MAC addresses, Layer 3 uses IP addresses
Layer 2 uses STP, Layer 3 does not
Layer 2 requires trunking, Layer 3 does not
Layer 2 is for switches, Layer 3 is for routers
Which command removes an interface from an EtherChannel group?
Interface no etherchannel 1
No channel-group 1
Interface channel-group 1 remove
No interface port-channel 1
In a Layer 3 EtherChannel, what happens if the IP address on one of the member interfaces is different from the other interfaces?
The EtherChannel forms but operates sub-optimally
The EtherChannel does not form
The switch automatically corrects the IP addresses
The member interface is excluded from the EtherChannel
What command configures LACP System Priority on a switch?
Lacp system-priority
Channel-protocol lacp
Channel-group system-priority
Port-channel system-priority
Which of the following is true regarding EtherChannel configuration on Nexus switches compared to Catalyst switches?
Nexus supports more EtherChannels
Catalyst supports more EtherChannels
There is no difference
Nexus uses a different command syntax
How can you ensure that an EtherChannel is balanced across its links in terms of traffic load?
Use the default load-balancing method
Manually assign traffic flows to specific links
Use an appropriate load-balancing method based on traffic patterns
Use only one link in the EtherChannel
What must match for all physical interfaces in an EtherChannel group to function correctly?
Port description
IP address
Allowed VLANs
Port security settings
In an EtherChannel, which command would you use to specify the EtherChannel protocol as LACP?
Channel-group 1 mode lacp
Channel-group 1 mode active
Channel-protocol lacp
Etherchannel-protocol lacp
How does EtherChannel affect STP (Spanning Tree Protocol) calculations?
EtherChannel disables STP
STP sees the EtherChannel as a single logical link
STP recalculates for each physical link
EtherChannel makes STP unnecessary
Which command enables you to view the configuration of a specific EtherChannel group?
Show etherchannel group 1
Show running-config etherchannel
Show port-channel 1
Show etherchannel detail
When configuring an EtherChannel, what would be the effect of using “mode on”?
It forces the interface to form an EtherChannel without negotiation
It enables PAgP negotiation
It enables LACP negotiation
It disables the interface
In a dual-homed scenario, where two switches are connected by an EtherChannel, what is a common practice to avoid loops?
Disable STP
Use different VLANs on each link
Enable STP on the EtherChannel
Configure one link as active and the other as standby
How do you determine the priority of an LACP EtherChannel?
Based on the MAC address
By setting the LACP priority on the switch
By the number of links in the EtherChannel
Based on the switch model
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