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EtherChannel and LACP Scenarios

Practise ENCOR 350-401 practice questions — original exam-style scenarios covering every exam domain, with detailed explanations, wrong-answer analysis, and common exam traps.

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350-401
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Cisco
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Scenario guide

How to approach etherchannel and lacp scenarios

EtherChannel bundles multiple physical links into a single logical port-channel. The CCNA tests LACP vs PAgP vs static EtherChannel, the mode combinations that form a channel, and common configuration errors. These appear as configuration tasks and troubleshooting scenarios.

Quick answer

EtherChannel questions usually test whether bundled links have matching settings and whether LACP, PAgP or static mode is being used correctly.

LACP, PAgP and static EtherChannel modes.

Matching speed, duplex, VLAN, trunk and native VLAN settings.

Port-channel interface behaviour.

Why a link fails to join an EtherChannel bundle.

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Practice set

Practice scenarios

Question 1mediummultiple choice
Full question →

An engineer is troubleshooting intermittent connectivity issues between two data center switches. The link is a 10GE LACP port-channel. Which misconfiguration could cause packet loss?

Question 2mediummultiple choice
Open the full VLAN trunking answer →

A network engineer is configuring EtherChannel between two Cisco Catalyst switches. The ports are configured as access ports in VLAN 10. After configuring the port-channel interface and adding the physical ports, the engineer notices that the EtherChannel does not come up. The show etherchannel summary command shows the port-channel in a down state. What is the most likely cause?

Question 3mediummultiple choice
Read the full EtherChannel explanation →

A network engineer is troubleshooting an EtherChannel between two Cisco switches. The show etherchannel 1 port-channel command shows the port-channel is up, but traffic is not load-balanced evenly. The engineer notices that all traffic is using only one link. The physical ports are all configured identically. What is the most likely cause?

Question 4mediummultiple choice
Open the full VLAN trunking answer →

An engineer is troubleshooting an EtherChannel between two switches. The show etherchannel summary output shows that the port-channel is up, but only one physical link is active. The other three links are in a suspended state. The physical ports are all configured identically with the same VLAN allowed. What is the most likely cause?

Question 5easymultiple choice
Read the full EtherChannel explanation →

A network engineer is configuring EtherChannel between two Cisco switches using LACP. The engineer wants to ensure that if fewer than two links are operational, the EtherChannel does not come up. Which command should be configured?

Question 6hardmultiple choice
Open the full VLAN trunking answer →

A network engineer is troubleshooting an EtherChannel between two Cisco switches. The show etherchannel summary command shows the port-channel is up, but the show interfaces trunk command shows that the trunk is not passing traffic for VLAN 100. The allowed VLAN list on the port-channel interface includes VLAN 100. What is the most likely cause?

Question 7easymultiple choice
Open the full VLAN trunking answer →

A network engineer is configuring an EtherChannel between a Cisco switch and a server that supports LACP. The switch ports are configured as trunk ports allowing multiple VLANs. The engineer wants to ensure the EtherChannel forms automatically without manual intervention. Which configuration should be applied on the switch?

Question 8easymultiple choice
Read the full EtherChannel explanation →

A network engineer is configuring an EtherChannel between two Cisco switches. The engineer wants to use PAgP and ensure that the channel forms only if the neighboring switch is also configured for PAgP. Which mode should be configured on the local switch?

Question 9hardmultiple choice
Open the full VLAN trunking answer →

A network engineer is configuring an EtherChannel between a Cisco switch and a router. The switch ports are configured as trunk ports with allowed VLANs 10, 20, and 30. The router is configured with subinterfaces for each VLAN. After configuring the EtherChannel, the engineer notices that the router can ping devices in VLAN 10 but not in VLAN 20 or 30. What is the most likely cause?

Question 10hardmultiple choice
Read the full EtherChannel explanation →

A network engineer is configuring an EtherChannel between two Cisco switches. The engineer wants to use LACP and ensure that the local switch is the one that determines which ports are active in the channel. Which configuration should be applied?

Question 11mediummultiple choice
Read the full EtherChannel explanation →

A network engineer runs the following command on Switch SW1:

SW1# show etherchannel summary

Flags: D - down P - bundled in port-channel I - stand-alone s - suspended H - Hot-standby (LACP only) R - Layer3 S - Layer2 U - in use N - not in use, no aggregation f - failed to allocate aggregator

M - not in use, minimum links not met u - unsuitable for bundling w - waiting to be aggregated d - default port

Number of channel-groups in use: 1 Number of aggregators: 1

Group Port-channel Protocol Ports ------+-------------+-----------+-------------------------------------------- 1 Po1(SU) LACP Gi0/0(P) Gi0/1(P) Gi0/2(s) Gi0/3(D)

Based on this output, what can be concluded?

Question 12mediummultiple choice
Read the full EtherChannel explanation →

A network engineer runs the following command on Switch SW2:

SW2# show interfaces port-channel 1 etherchannel

Port-channel1 :

Age of the Port-channel = 0d:00h:10m:32s Logical slot/port = 16/1 Number of ports = 2 HotStandby port = null Port state = Port-channel Ag-Inuse Protocol = LACP

Ports in the Port-channel:

Index Load Port EC state No of bits ------+------+------+----------------+---------- 0 00 Gi0/0 Active 4 1 00 Gi0/1 Active 4

Time since last port bundled: 0d:00h:05m:23s Gi0/1

Based on this output, what can be concluded?

Question 13easymultiple choice
Read the full EtherChannel explanation →

A network engineer runs the following command on Switch SW3:

SW3# show etherchannel load-balance

EtherChannel Load-Balancing Configuration: src-dst-ip

EtherChannel Load-Balancing Operational State: src-dst-ip

Based on this output, what can be concluded?

Question 14hardmultiple choice
Read the full EtherChannel explanation →

A network engineer runs the following command on Switch SW4:

SW4# show etherchannel 1 detail
Channel-group number: 1

Group state = L2

Ports in the group: -------------------

Port: Gi0/0 --------

Port state = Up, In-Bundle Channel group = 1 Mode = Active/PagNego Gcchange = - Port-channel = Po1 GC = 0x00010001 Pseudo port-channel = Po1

Port index = 0 Load = 0x00

Flags: S - Device is sending Slow LACPDUs F - Device is sending Fast LACPDUs A - Device is in active mode. P - Device is in passive mode.

Local information:

LACP port Admin Oper Port Port Port Flags State Priority Key Key Number State Gi0/0 SA bndl 32768 0x1 0x1 0x101 0x3D

Partner information:

LACP port Admin Oper Port Port Port Flags State Priority Key Key Number State Gi0/0 SA bndl 32768 0x1 0x1 0x102 0x3D

Age of the port = 0d:00h:15m:20s

Based on this output, what can be concluded?

Question 15mediummultiple choice
Open the full VLAN trunking answer →

A network engineer runs the following command on Switch SW5:

SW5# show running-config | section interface port-channel
interface Port-channel1
 switchport mode trunk
 switchport trunk allowed vlan 1-100,200-300

!

interface Port-channel2
 switchport mode access
 switchport access vlan 10

!

SW5# show interfaces trunk

Port Mode Encapsulation Status Native vlan Po1 on 802.1q trunking 1

Port Vlans allowed on trunk Po1 1-100,200-300

Port Vlans allowed and active in management domain Po1 1-100,200-300

Port Vlans in spanning tree forwarding state and not pruned Po1 1-100,200-300

Based on this output, what can be concluded?

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