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This page has 8 EtherChannel and LACP Scenarios scenario questions for the 350-601 exam, each with detailed explanations and wrong-answer analysis.

How should I approach 350-601 scenario questions?

Read the full scenario before looking at the answer options. Identify the constraint or requirement in the scenario, then eliminate options that are generally true but wrong for this specific case. Scenario questions reward careful reading over pattern matching.

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EtherChannel and LACP Scenarios

Practise Cisco DCCOR / CCNP Data Center Core 350-601 practice questions — original exam-style scenarios covering every exam domain, with detailed explanations, wrong-answer analysis, and common exam traps.

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scenario questions

350-601

exam code

Cisco

vendor

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.

Practice scenarios

Question 1mediumdrag order

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Arrange the steps to configure a port-channel (LAG) on a Cisco Nexus switch.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps

Order

1Step 1

2Step 2

3Step 3

4Step 4

5Step 5

Question 2easymultiple choice

Read the full NAT/PAT explanation →

An engineer needs to design a resilient Fibre Channel SAN that eliminates single points of failure between two MDS switches and a storage array with two controllers. What is the minimum number of FC port channels required to achieve this goal?

A
Three
Why wrong: Unnecessary; two suffices.
B
Two
Two port channels allow each controller to connect to both switches.
C
One
Why wrong: One port channel would connect only one controller to only one switch.
D
Four
Why wrong: Overkill; two is sufficient for redundancy.

Full breakdown with real-world context →

Question 3hardmultiple choice

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On a Cisco MDS 9700, an engineer configures an FC port channel with 4 member interfaces. The connected storage array also supports port channels. Which load-balancing algorithm provides the best distribution of I/O when the array uses multiple LUNs per target?

A
Source ID (SID) and Destination ID (DID)
Why wrong: This could cause polarization if single initiator to single target.
B
Source and destination port ID
Why wrong: Port ID load balancing is similar to SID/DID and may cause polarization.
C
Source FC ID (OXID) and destination FC ID (RXID)
Using exchange IDs (OXID/RXID) provides per-exchange load balancing, spreading I/O across LUNs better.
D
Source and destination WWPN
Why wrong: WWPN load balancing treats all traffic between pair as single flow.

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Question 4hardmulti select

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Which THREE conditions must be met before a UCS Fabric Interconnect can be part of a port channel? (Select THREE.)

A
Ports should come from different FEX modules for redundancy.
Why wrong: FEX is not used; ports are on the FI.
B
All ports must be on the same side of the switch (either all uplink or all server-facing).
Port channels cannot mix uplink and server ports.
C
Ports should be configured as admin down until the port channel is formed.
Why wrong: Ports must be admin up to form port channel.
D
The ports must belong to the same virtual port channel (vPC) domain.
Port channels in UCS are part of a vPC configuration.
E
All ports in the port channel must have the same speed and duplex settings.
Consistent speed/duplex is required for proper operation.

Full breakdown with real-world context →

Question 5easymultiple choice

Full question →

A network engineer is configuring a VPC peer-link on a Nexus switch. Which interface configuration is required for the peer-link port-channel?

A
switchport mode trunk
Trunk mode allows multiple VLANs to traverse the peer-link.
B
spanning-tree port type edge trunk
Why wrong: While this enables PortFast on trunk, it is not required for peer-link functionality.
C
switchport mode access
Why wrong: Access mode is not suitable for a peer-link that requires multiple VLANs.
D
no switchport
Why wrong: This makes the interface a layer 3 port, which cannot carry VLANs.

Full breakdown with real-world context →

Question 6easymultiple choice

Review the full OSPF breakdown →

Refer to the exhibit. A network engineer has configured a port-channel for OSPF adjacency. What additional configuration is required for the port-channel to operate correctly?

Exhibit

interface Port-channel10
 no switchport
 ip address 10.1.1.1/30
 ip ospf network point-to-point

A
Set the OSPF priority.
Why wrong: Priority is optional and does not affect basic functionality.
B
No additional configuration needed.
Why wrong: Member interfaces are missing; port-channel is essentially empty.
C
Enable OSPF on the port-channel with `ip router ospf process`.
Why wrong: OSPF is enabled on the interface once the network command covers it.
D
Configure the channel-group mode on member interfaces.
Member interfaces must be assigned to the port-channel using `channel-group`.

Full breakdown with real-world context →

Question 7hardmultiple choice

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An organization has deployed a pair of Nexus 93180YC-EX switches as vPC peers in a data center. The switches are connected to a server with two 10GbE interfaces configured as an LACP port-channel. The vPC configuration has been verified and was working correctly for months. After a scheduled maintenance window that included upgrading the NX-OS software from version 7.0(3)I7(1) to 7.0(3)I7(5), the server begins experiencing frequent link flaps on the port-channel. The server administrator reports that every 5-10 minutes, the link goes down for about 2 seconds and then recovers. The network team checks the logs on the Nexus switches and sees repeated messages: 'LACP-3-MISCONFIG: Port-channel <channel> is misconfigured: partner not on same aggregator.' The 'show vpc brief' output shows all vPCs in the 'up' state. The 'show port-channel summary' shows the port-channel is up with both member ports in the bundle. What is the most likely root cause?

A
The LACP fast rate timer default changed to slow in the new software, causing a timeout mismatch with the server.
Why wrong: LACP rate mismatch would cause constant timeout and the log message would be different.
B
The vPC delay-restore timer is set too low, causing the vPC to prematurely come up before LACP is fully up.
Why wrong: Delay-restore timer affects only initial recovery after a failure, not ongoing link flaps.
C
The vPC peer-link VLAN allowed list does not include the server's VLAN, causing intermittent drops.
Why wrong: A missing VLAN would cause persistent failure, not intermittent flaps with the specific LACP error.
D
The LACP system priority is not configured consistently between the vPC peers, causing the LACP system identifier to differ.
In a vPC, the LACP system identifier must be identical on both peers to appear as a single partner to the server. Inconsistent system priority leads to different identifiers, triggering the misconfiguration log and link flaps.

Full breakdown with real-world context →

Question 8hardmultiple choice

Open the full VLAN trunking answer →

You are a network engineer at a financial institution. The company has two data centers: DC1 and DC2, connected via a dark fiber link. Each data center has a pair of Nexus 7000 switches in a vPC configuration. The dark fiber link connects to a port on each Nexus 7000 pair using a Layer 2 port-channel. The requirement is to extend VLAN 100 between the two data centers for a critical application that requires a stretched Layer 2 domain. The current configuration has the port-channel on both sides set to mode 'active' with LACP. VLAN 100 is allowed on the trunk. The application servers report intermittent connectivity issues, with some packets being dropped. Upon inspection, you notice that the MAC address table on the Nexus 7000 in DC1 shows the MAC address of the server in DC2 on the dark fiber port-channel interface, but also on a local access port connected to a different server in the same VLAN. What is the most likely cause of the intermittent connectivity?

A
The dark fiber link is experiencing high latency, causing MAC address timeouts.
Why wrong: High latency would not cause the same MAC to appear on two different interfaces.
B
LACP is misconfigured on one side, causing the port-channel to operate as individual links.
Why wrong: If LACP were misconfigured, the port-channel would not be up.
C
There is an asymmetric routing issue between the data centers.
Why wrong: Asymmetric routing is Layer 3; the issue is Layer 2.
D
Spanning Tree Protocol is not blocking one of the redundant paths, creating a loop.
A loop causes MAC flapping and intermittent connectivity.

Full breakdown with real-world context →

These 350-601 practice questions are part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style 350-601 questions with detailed explanations, topic-based practice, mock exams, readiness tracking, and study analytics.

EtherChannel and LACP Scenarios

How to approach etherchannel and lacp scenarios

Quick answer

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Practice scenarios

Arrange the steps to configure a port-channel (LAG) on a Cisco Nexus switch.

An engineer needs to design a resilient Fibre Channel SAN that eliminates single points of failure between two MDS switches and a storage array with two controllers. What is the minimum number of FC port channels required to achieve this goal?

On a Cisco MDS 9700, an engineer configures an FC port channel with 4 member interfaces. The connected storage array also supports port channels. Which load-balancing algorithm provides the best distribution of I/O when the array uses multiple LUNs per target?

Which THREE conditions must be met before a UCS Fabric Interconnect can be part of a port channel? (Select THREE.)

A network engineer is configuring a VPC peer-link on a Nexus switch. Which interface configuration is required for the peer-link port-channel?

Refer to the exhibit. A network engineer has configured a port-channel for OSPF adjacency. What additional configuration is required for the port-channel to operate correctly?

Exhibit