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EtherChannel Flashcards

Study/Learn EhterChannel

1
Q 
Which set of configurations will result in all ports on both switches successfully bundling
into an EtherChannel?
A. switch1
    channel-group 1 mode active
    switch2
    channel-group 1 mode auto
B. switch1
    channel-group 1 mode desirable
    switch2
    channel-group 1 mode passive
C. switch1
    channel-group 1 mode on
    switch2
    channel-group 1 mode auto
D. switch1
     channel-group 1 mode desirable
     switch2
     channel-group 1 mode auto
A

D. switch1
channel-group 1 mode desirable
switch2
channel-group 1 mode auto

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2
Q

After an EtherChannel is configured between two Cisco switches, interface port channel 1 is in the down/down state. Switch A is configured with ―channel-group 1 mode active‖, while
Switch B is configured with ―channel-group 1 mode desirable‖. Why is the EtherChannel bundle not working?
A. The switches are using mismatched EtherChannel negotiation modes.
B. The switch ports are not configured in trunking mode.
C. LACP priority must be configured on both switches.
D. The channel group identifier must be different for Switch A and Switch B.

A

A. The switches are using mismatched EtherChannel negotiation modes.

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3
Q

An EtherChannel bundle has been established between a Cisco switch and a corporate web server. The network administrator noticed that only one of the EtherChannel links is being utilized to reach the web server.
What should be done on the Cisco switch to allow for better EtherChannel utilization to the corporate web server?
A. Enable Cisco Express Forwarding to allow for more effective traffic sharing over the EtherChannel bundle.
B. Adjust the EtherChannel load-balancing method based on destination IP addresses.
C. Disable spanning tree on all interfaces that are participating in the EtherChannel bundle.
D. Use link-state tracking to allow for improved load balancing of traffic upon link failure to the server.
E. Adjust the EtherChannel load-balancing method based on source IP addresses.

A

E. Adjust the EtherChannel load-balancing method based on source IP addresses.

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4
Q

An access switch has been configured with an EtherChannel port. After configuring SPAN to monitor this port, the network administrator notices that not all traffic is being replicated to the management server. What is a cause for this issue?
A. VLAN filters are required to ensure traffic mirrors effectively.
B. SPAN encapsulation replication must be enabled to capture EtherChannel destination traffic.
C. The port channel can be used as a SPAN source, but not a destination.
D. RSPAN must be used to capture EtherChannel bidirectional traffic.

A

C. The port channel can be used as a SPAN source, but not a destination.

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5
Q

A network engineer tries to configure storm control on an EtherChannel bundle. What is the result of the configuration?
A. The storm control settings will appear on the EtherChannel, but not on the associated physical ports.
B. The configuration will be rejected because storm control is not supported for EtherChannel.
C. The storm control configuration will be accepted, but will only be present on the physical interfaces.
D. The settings will be applied to the EtherChannel bundle and all associated physical interfaces.

A

D. The settings will be applied to the EtherChannel bundle and all associated physical interfaces.

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6
Q

A network engineer must set the load balance method on an existing port channel. Which action must be done to apply a new load balancing method?
A. Configure the new load balancing method using port-channel load-balance.
B. Adjust the switch SDM back to “default”.
C. Ensure that IP CEF is enabled globally to support all load balancing methods.
D. Upgrade the PFC to support the latest load balancing methods.

A

A. Configure the new load balancing method using port-channel load-balance.

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7
Q

A network engineer configured a fault-tolerance link on Gigabit Ethernet links G0/1, G0/2, G0/3, and G0/4 between two switches using Ethernet port-channel. Which action allows interface G0/1 to always actively forward traffic in the port-channel?
A. Configure G0/1 as half duplex and G0/2 as full duplex.
B. Configure LACP port-priority on G0/1 to 1.
C. Configure LACP port-priority on G0/1 to 65535.
D. LACP traffic goes through G0/4 because it is the highest interface ID.

A

B. Configure LACP port-priority on G0/1 to 1.

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8
Q

Which statement about the use of PAgP link aggregation on a Cisco switch that is running Cisco IOS Software is true?
A. PAgP modes are off, auto, desirable, and on. Only the combinations auto-desirable, desirable- desirable, and on-on allow the formation of a channel.
B. PAgP modes are active, desirable, and on. Only the combinations active-desirable, desirable- desirable, and on-on allow the formation of a channel.
C. PAgP modes are active, desirable, and on. Only the combinations active-active, desirable-desirable, and on-on allow the formation of a channel.
D. PAgP modes are off, active, desirable, and on. Only the combinations auto-auto, desirable-desirable, and on-on allow the formation of a channel.

A

A. PAgP modes are off, auto, desirable, and on. Only the combinations auto-desirable, desirable- desirable, and on-on allow the formation of a channel.

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9
Q

Server_Switch#sh etherchannel load-balance
EtherChannel Load-Balancing Operational State (src-mac):
Non-IP: Source MAC address
IPv4: Source MAC address
IPv6: Source IP address
——
However, traffic is still slow. Which action can the engineer take to resolve this issue?
A. Disable EtherChannel load balancing.
B. Upgrade the switch IOS to IP services image.
C. Change the load-balance method to dst-mac.
D. Contact Cisco TAC to report a bug on the switch.

A

C. Change the load-balance method to dst-mac.

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10
Q

A network engineer changed the port speed and duplex setting of an existing EtherChannel bundle that uses the PAgP protocol. Which statement describes what happens to all ports in the bundle?
A. PAgP changes the port speed and duplex for all ports in the bundle.
B. PAgP drops the ports that do not match the configuration.
C. PAgP does not change the port speed and duplex for all ports in the bundle until the switch
is rebooted.
D. PAgP changes the port speed but not the duplex for all ports in the bundle.

A

A. PAgP changes the port speed and duplex for all ports in the bundle.

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11
Q

Which statement about using EtherChannel on Cisco IOS switches is true?
A. A switch can support up to eight compatibly configured Ethernet interfaces in an EtherChannel. The EtherChannel provides full-duplex bandwidth up to 800 Mbps only for Fast EtherChannel or 8 Gbps only for Gigabit EtherChannel.
B. A switch can support up to 10 compatibly configured Ethernet interfaces in an EtherChannel. The EtherChannel provides full-duplex bandwidth up to 1000 Mbps only for Fast EtherChannel or 8 Gbps only for Gigabit EtherChannel.
C. A switch can support up to eight compatibly configured Ethernet interfaces in an EtherChannel. The EtherChannel provides full-duplex bandwidth up to 800 Mbps only for Fast EtherChannel or 16 Gbps only for Gigabit EtherChannel.
D. A switch can support up to 10 compatibly configured Ethernet interfaces in an EtherChannel. The EtherChannel provides full-duplex bandwidth up to 1000 Mbps only for Fast EtherChannel or 10 Gbps only for Gigabit EtherChannel.

A

A. A switch can support up to eight compatibly configured Ethernet interfaces in an EtherChannel. The EtherChannel provides full-duplex bandwidth up to 800 Mbps only for Fast EtherChannel or 8 Gbps only for Gigabit EtherChannel.

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12
Q 
What is the maximum number of 10 Gigabit Ethernet connections that can be utilized in an EtherChannel for the virtual switch link?
A. 4
B. 6
C. 8
D. 12
A

C. 8

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13
Q

Which statement about restrictions for multichassis LACP is true?
A. It is available only on a Cisco Catalyst 6500 Series chassis.
B. It does not support 1Gb links.
C. Converting a port channel to mLACP can cause a service disruption.
D. It is not available in VSS.

A

C. Converting a port channel to mLACP can cause a service disruption.
FIND OUT WITH MLACP IS

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14
Q 
Which four LACP components are used to determine which hot-standby links become active after an interface failure within an EtherChannel bundle? (Choose four)
A. LACP system priority
B. hot-standby link identification number
C. system ID
D. interface bandwidth
E. LACP port priority
F. port number
G. interface MAC address
A

A. LACP system priority
C. System ID
E. LACP port priority
F. port number

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15
Q 
An engineer is configuring an EtherChannel between two switches using LACP. If the EtherChannel mode on switch 1 is configured to active, which two modes on switch 2 establish an operational EtherChannel? (Choose two)
A. active
B. auto
C. desirable
D. on
E. passive
A

A. active

E. passive

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16
Q

When a Layer 2 EtherChannel is configured, which statement about placement of the IP address is true?
A. The IP address is placed on the highest numbered member port.
B. The IP address is placed on the port-channel logical interface.
C. The IP address is placed on the lowest numbered member port.
D. The IP address is assigned via DHCP only.

A

B. The IP address is placed on the port-channel logical interface.

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17
Q

Which option is valid for EtherChannel load balancing?
A. source MAC address and source IP address
B. destination MAC address and destination IP address
C. source MAC address and destination IP address
D. source MAC address and destination MAC address

A

D. source MAC address and destination MAC address

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18
Q

When EtherChannel guard is enabled and a misconfiguration is detected on a port, how does the port respond?
A. It enters the shutdown state
B. The port state remains unchanged, but the EtherChannel stays down
C. The port remains up, but it is unable to pass traffic
D. It enters the channel-error state
E. It enters the errdisable state

A

E. It enters the errdisable state

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19
Q 
When using EtherChannel misconfiguration guard,which technology is used to prevent this type of misconfiguration from affecting the network?
A. LACP
B. PagP
C. STP
D. Port Security
A

C. STP

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20
Q 
What should match during EtherChannel configuration? (Choose two)
A. spanning tree port priority
B. spanning tree cost
C. interface description
D. trunk mode
E. allowed VLANs on the trunk
A

D. trunk mode

E. allowed VLANs on the trunk

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21
Q 
If all devices on an EtherChannel are sending traffic to a single MAC address, which two methods of load balancing on the EtherChannel are preferred? (Choose two)
A. destination-MAC
B. dest-source-MAC
C. destination-IP
D. source-MAC
E. source-IP
A

D. source-MAC

E. source-IP

22
Q

There was an EtherChannel configured and one of the port was used as SPAN destination. What will be the result?
A. the EtherChannel will not be operational because the port cannot be used as SPAN destination
B. EtherChannel will discard the port used
C. the EtherChannel will shutdown

A

B. EtherChannel will discard the port used

23
Q 
Which two combinations of EtherChannel modes support the formation of an EtherChannel? (Choose two)
A. desirable, passive
B. desirable, desirable
C. active, passive
D. passive, passive
E. active, desirable
A

B. desirable, desirable

C. active, passive

24
Q 
EtherChannel guard. What happens to the port when it’s misconfigured?
A. channel gets disabled
B. goes into err-disable
C. shutdown
D. works normal
A

B. goes into err-disabl

25
Q 
Which EtherChannel combination is possible to create a trunk link?
A. passive-passive
B. desirable-active
C. passive-auto
D. desirable-desirable
A

D. desirable-desirable

26
Q 
Which EtherChannel load balancing algorithm should be used to optimize the EtherChannel links between switches?
A. Source MAC
B. Source-dest MAC
C. Destination IP
D. Destination MAC
A

C. Destination IP
D. Destination MAC

*There’s an Exhibit that goes along with this - 2 servers connected to one switch -> connected to another switch with 2 etherchannel links -> to a PC… doesnt really help with this question though.

27
Q 
Which two operational attributes can be checked for EtherChannel ports that are in err-disabled state?
A. Port mode
B. Port cost
C. Duplex
D. DTP
E. VLAN
A

C. Duplex

E. VLAN

28
Q

Question about LACP priority.
A. LACP priority is used to determine which port is used to form the EtherChannel
B. LACP priority is removed from EtherChannel…
C. There was a command about LACP priority
D. LACP priority is used to determine which port is put in standby mode

A

D. LACP priority is used to determine which port is put in standby mode

29
Q 
What is the default mode for LACP EtherChannel when configured?
A. On
B. Active
C. Passive
D. Desirable
E. Off
A

C. Passive

30
Q 
What condition must match during Etherchannel configuration? (Choose two)
A. Spanning tree port priority
B. Spanning tree cost
C. Interface Description
D. Trunk mode
E. Trunk allow vlan
A

D. Trunk mode

E. Trunk allow vlan

31
Q 
An engineer is configuring an EtherChannel between two switches using PAgP. If the EtherChannel mode on switch 1 is configured to auto, which modes on switch 2 establish an operational EtherChannel?
A. active
B. auto
C. desirable
D. on
E. passive
A

C. desirable

32
Q 
What are possible EtherChannel load balancing mechanisms based on layer 3? (Choose two)
A. MAC source
B. MAC source-destination
C. IP Source
D. IP Source-destination
E. MAC Destination
A

C. IP Source

D. IP Source-destination

33
Q 
Which two command sequences must you enter on a pair switches so that they negotiate?
(Choose two)
A. channel-protocol lacp
channel-group 1 mode auto
B. channel-protocol lacp
channel-group 1 mode passive
C. channel-protocol pagp
channel-group 1 mode on
D. channel-protocol pagp
channel-group 1 mode auto
E. channel-protocol lacp
channel-group 1 mode active
A

B. channel-protocol lacp
channel-group 1 mode passive
E. channel-protocol lacp
channel-group 1 mode active

34
Q

Which two commands can you enter to configure load-balancing at Layer 2? (Choose two)
A. port-channel load-balance dst-ip
B. port-channel load-balance src-dst-ip
C. port-channel load-balance src-mac
D. port-channel load-balance src-dest-mac
E. port-channel load-balance src-ip

A

C. port-channel load-balance src-mac

D. port-channel load-balance src-dest-mac

35
Q

Which two conditions must be met to establish a Layer 2 EtherChannel? (Choose two)
A. SPAN must be disabled on the ports.
B. LAN ports in the EtherChannel must be contiguous.
C. The trunking protocol must be the same for all links in the EtherChannel.
D. All ports in the EtherChannel must be on the same module.
E. All ports in the EtherChannel must operate in half duplex.

A

A. SPAN must be disabled on the ports.

C. The trunking protocol must be the same for all links in the EtherChannel.

36
Q

Which option is valid for Etherchannel Load Balancing?
A. source MAC and source IP addresses
B. destination MAC and destination IP addresses
C. source MAC and destination IP addresses
D. source MAC and destination MAC addresses

A

D. source MAC and destination MAC addresses

37
Q

A single server in company is connected via Etherchannel to a single upstream switch. Which
Etherchannel load balancing method on the switch makes optimal use of the redundant links
as traffic flows from the routers to the server?
A. source and destination MAC address
B. destination MAC address
C. source IP address
D. source MAC address

A

C. source IP address

38
Q 
Which two attributes must match across the member ports, when a Layer 2 EtherChannel is configured? (Choose two)
A. switchport mode
B. spanning-tree cost
C. spanning-tree priority
D. VLAN membership
A

A. switchport mode

D. VLAN membership

39
Q

Which two statements about manually-configured LACP EtherChannels are true? (Choose two)
A. LACP negotiation must be disabled on both devices in the EtherChannel.
B. They require Cisco Discovery Protocol.
C. Each physical port in the EtherChannel must have the same speed and duplex settings.
D. LACP negotiation must be disabled on one device in the EtherChannel.
E. They use an MD5 hash for equal load balancing.
F. If the physical port configurations on the two devices are different, the ports are placed
into the errdisabled state.

A

C. Each physical port in the EtherChannel must have the same speed and duplex settings.
F. If the physical port configurations on the two devices are different, the ports are placed into the errdisabled state.

40
Q 
When a Layer 2 trunking EtherChannel is configured, which two attributes must match across the member ports? (Choose two)
A. interface description
B. spanning-tree cost
C. spanning-tree priority
D. allowed VLANs
E. trunking mode
A

D. allowed VLANs

E. trunking mode

41
Q

spanning-tree mode pvst
spanning-tree etherchannel guard misconfig
——
Which effect of this configuration is true?
A. The switch port continues to negotiate an EtherChannel even when there are configuration
discrepancies between the two ports.
B. Spanning tree blocks EtherChannel formation on the device.
C. The switch port error disables when a port attempts to form an EtherChannel with a port that has a different configuration.
D. Spanning tree is disabled if the switch port establishes an EtherChannel.

A

C. The switch port error disables when a port attempts to form an EtherChannel with a port that has a different configuration.

42
Q

Which two tasks must you perform on a device to ensure that an EtherChannel operates at Layer 3? (Choose two)
A. Configure the channel-group 10 mode on command on the port channel.
B. Configure EtherChannel directly on the interface.
C. Configure the switchport mode access command on the device.
D. Configure the no switchport command on the physical interface(s).
E. Configure the switchport mode trunk command on the device.

A

B. Configure EtherChannel directly on the interface.

D. Configure the no switchport command on the physical interface(s).

43
Q

Which command do you use to configure EtherChannel guard feature?
A. SW(config)# spanning-tree etherchannel guard misconfig
B. SW(config)# portchannel etherchannel guard misconfig
C. SW(config-if)# portchannel etherchannel guard misconfig
D. SW(config-if)# spanning-tree etherchannel guard misconfig

A

A. SW(config)# spanning-tree etherchannel guard misconfig

44
Q 
Which of the below options is valid for EtherChannel load-balancing?
A. source MAC, destination IP
B. source MAC, destination MAC
C. source IP, source MAC
D. destination IP, MAC IP
A

B. source MAC, destination MAC

45
Q 
A Layer 2 EtherChannel is formed. Where do you assign an IP address?
A. DHCP
B. physical interface
C. logical interface
D. lowest physical interface
A

C. logical interface

46
Q 
Etherchannel load balancing uses which of the following? (Choose three)
A. VLAN ID
B. IP priority
C. IP address
D. MAC address
E. Port number
A

C. IP address
D. MAC address
E. Port number

47
Q

When you configure error disable recovery, which keyword will be used if it was due to EtherChannel misconfig?
A. security violation
B. channel-misconfig

A

B. channel-misconfig

48
Q 
PAgP mode that is receiving but will not initiate formation of Etherchannel?
A. Auto
B. Desirable
C. On
D. Off
A

A. Auto

49
Q

Which two statements about configuring EtherChannel are true? (Choose two)
A. They can be configured to passively negotiate a channel with a connected peer.
B. They can be configured with the no switchport command to place them in Layer 3 mode.
C. They can be configured to load-balancing traffic based on Layer 7 information.
D. They can be configured to operate with up to 10 links in a single channel.
E. They can be configured to send Layer 2 packets.

A

A. They can be configured to passively negotiate a channel with a connected peer.
B. They can be configured with the no switchport command to place them in Layer 3 mode.

50
Q 
In which EtherChannel mode does a port receive and respond to PAgP message without initiating EtherChannel communication?
A. desirable
B. active
C. on
D. auto
A

D. auto

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