How many VLAN and Inter-VLAN Routing Scenarios questions are on this page?

This page has 5 VLAN and Inter-VLAN Routing Scenarios scenario questions for the 350-501 exam, each with detailed explanations and wrong-answer analysis.

How should I approach 350-501 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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Scenario-based practice

VLAN and Inter-VLAN Routing Scenarios

Practise 350-501 VLAN and trunking questions covering access ports, trunk ports, allowed VLAN lists, native VLAN, inter-VLAN routing, and command-output troubleshooting.

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Scenario guide

How to approach vlan and inter-vlan routing scenarios

VLAN misconfiguration is one of the top sources of connectivity failures in real networks and one of the most tested areas on the CCNA. These questions cover VLAN access ports, 802.1Q trunks, native VLANs, and router-on-a-stick or layer-3 switch inter-VLAN routing.

Quick answer

Routing questions usually test route selection (administrative distance, metric), how static routes are configured and when they are preferred over dynamic routing.

Administrative distance comparing routing sources.

Static route configuration: next-hop vs exit interface.

Default route propagation and the gateway of last resort.

Recursive routing table lookups.

Practice scenarios

Question 1easymultiple choice

Read the full MPLS explanation →

A service provider is designing a Layer 2 MPLS VPN to connect multiple customer sites. Which technology should be used to provide end-to-end Ethernet service with MAC address transparency and support for multiple customer VLANs?

A
MPLS Traffic Engineering (MPLS TE)
Why wrong: MPLS TE optimizes traffic flows, but does not provide Layer 2 VPN services.
B
VPLS (Virtual Private LAN Service)
VPLS provides multipoint Ethernet services with MAC address transparency and supports multiple VLANs via QinQ or VLAN mapping.
C
VPWS (Virtual Private Wire Service)
Why wrong: VPWS is a point-to-point service, not multipoint, and does not support MAC learning across multiple sites.
D
RSVP-TE signaling
Why wrong: RSVP-TE is used to establish TE tunnels, not to provide L2VPN services.

Full breakdown with real-world context →

Question 2mediumdrag order

Open the full VLAN trunking answer →

Drag and drop the steps to configure a VLAN on a Cisco switch into the correct order.

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 3mediummultiple choice

Open the full VLAN trunking answer →

A network engineer at a service provider is using Cisco NSO to automate the provisioning of VLANs on thousands of access devices. The engineer creates a service using a custom YANG model and deploys it to a set of devices. However, the deployment fails with a 'failed to reach devices' error for some devices, while others succeed. The engineer checks device connectivity and confirms all devices are reachable via SSH and NETCONF. The engineer also verifies that the NSO device list is accurate and includes all target devices. What is the most likely cause of the failure?

A
The service model uses an unsupported feature on those devices.
Why wrong: An unsupported feature would result in a validation error, not a connectivity failure.
B
The devices are not in sync with NSO.
Out-of-sync devices prevent NSO from deploying services on them, and the error may manifest as 'failed to reach' because NSO cannot reconcile the configuration.
C
The devices have insufficient memory to accept the configuration.
Why wrong: Insufficient memory would cause a different error during configuration push, not a 'failed to reach' error.
D
The NSO package is not loaded on those devices.
Why wrong: NSO packages are loaded on the NSO server, not on the devices; this would not affect reachability.

Full breakdown with real-world context →

Question 4easymultiple choice

Read the full MPLS explanation →

A service provider is deploying a point-to-point Layer 2 VPN across an MPLS network using Ethernet over MPLS (EoMPLS) with Martini encapsulation. The customer requires transparent transport of VLAN tags (Q-in-Q) between two sites. The provider configures the attachment circuits on the PE routers as VLAN subinterfaces with dot1q encapsulation. After configuration, the customer reports that only untagged frames pass through the pseudowire; double-tagged frames are dropped at the egress PE. Which action resolves the issue?

Question 5hardmultiple choice

Read the full MPLS explanation →

A large service provider is migrating its L2VPN services (VPWS and VPLS) to EVPN-based solutions to improve scalability and support multi-homing. During the rollout for a customer using VLAN-based EVPN for a data center interconnect, the operations team notices frequent MAC address flapping and broadcast storms on one of the attachment circuits connected to a PE router. The PE is configured for EVPN-MPLS with ESI multihoming using all-active mode. The customer has two PEs (PE1 and PE2) connected to the same CE via two separate Ethernet links. The MAC table on PE1 shows the same MAC address alternating between the local AC interface and the remote EVPN peers. What is the most likely cause and the correct action to resolve this issue?

A
Implement ESI multihoming with per-flow load balancing to ensure consistent designated forwarder election.
Proper ESI configuration and DF election prevent duplicate MACs and loops; per-flow load balancing can help but the key is correct ESI.
B
Disable split-horizon on the local AC interface to allow MAC learning from the CE directly.
Why wrong: Disabling split-horizon would likely cause loops and increase flapping.
C
Enable selective multicast on the EVPN instance to reduce broadcast traffic.
Why wrong: Selective multicast is for multicast optimization, not for MAC flapping in EVPN.
D
Use MPLS encapsulation instead of VXLAN to avoid MAC address issues.
Why wrong: Encapsulation type does not affect MAC learning; the issue is in the EVPN control plane.

Full breakdown with real-world context →

These 350-501 practice questions are part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style 350-501 questions with detailed explanations, topic-based practice, mock exams, readiness tracking, and study analytics.

VLAN and Inter-VLAN Routing Scenarios

How to approach vlan and inter-vlan routing scenarios

Quick answer

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Practice scenarios

A service provider is designing a Layer 2 MPLS VPN to connect multiple customer sites. Which technology should be used to provide end-to-end Ethernet service with MAC address transparency and support for multiple customer VLANs?

Drag and drop the steps to configure a VLAN on a Cisco switch into the correct order.