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Scenario-based practice

VLAN and Inter-VLAN Routing Scenarios

Practise 200-901 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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200-901
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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.

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Practice set

Practice scenarios

Question 1mediummultiple choice
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A company uses a /24 subnet for its office LAN. The network must accommodate 30 hosts per VLAN. Which subnet mask would be most efficient for each VLAN while minimizing wasted IP addresses?

Question 2easymultiple choice
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A network engineer is configuring a new switch and needs to ensure that frames from VLAN 10 and VLAN 20 are isolated on the same trunk link to another switch. Which IEEE standard should be configured on the trunk interfaces?

Question 3mediummultiple choice
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A network administrator configures a switch port to belong to VLAN 10. Which OSI layer is primarily involved in VLAN tagging?

Question 4easymultiple choice
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A network engineer is troubleshooting a connectivity issue between two hosts in different VLANs on the same switch. The hosts are in VLAN 10 and VLAN 20, respectively. The switch has an SVI for each VLAN and IP routing is enabled. Which command should be used to verify that the switch is forwarding traffic between the VLANs?

Question 5mediummultiple choice
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Refer to the exhibit. A switch has the VLAN configuration shown. If a device is connected to interface Gi0/3 and another to Gi0/5, can they communicate if the switch is not configured with any inter-VLAN routing?

Exhibit

Refer to the exhibit.
```
Switch# show vlan brief

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Gi0/1, Gi0/2
10   Engineering                      active    Gi0/3, Gi0/4
20   Marketing                        active    Gi0/5, Gi0/6
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup
```
Question 6hardmultiple choice
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A company has a three-tier data center architecture with access, aggregation, and core layers. The network team is migrating to a leaf-spine architecture to support increasing east-west traffic. The current network uses STP for loop prevention, and the team wants to eliminate STP in the new design. They plan to use VXLAN overlays with BGP EVPN for control plane. During a pilot deployment, the team notices that some legacy servers that rely on traditional VLANs are not reachable across the new fabric. The servers are connected to access switches that are part of the leaf layer. The access switches are configured as VXLAN tunnel endpoints (VTEPs) but the legacy servers are still using traditional VLANs. The team needs to ensure connectivity between the legacy VLAN-based servers and the new VXLAN-based network. What is the best approach to integrate these legacy servers without changing their configuration?

Question 7hardmultiple choice
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A large enterprise uses Cisco Meraki for their wireless and switching infrastructure. The network team has developed a Python script that uses the Meraki API to automatically update SSID configurations across all networks. The script has been running successfully for months, performing daily updates to SSID settings such as names, passwords, and VLAN assignments. Recently, the script started failing with the following error message: '{"errors":["This operation is not allowed for this network"]}'. The team has verified the following: the API key is still valid and has access to the full organization, the network IDs used in the script are correct and the networks are active, and no changes have been made to the script code. The script uses the PUT endpoint '/networks/{networkId}/wireless/ssids/{number}' to update SSIDs. What is the most likely cause of the failure?

Question 8easymultiple choice
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Using the Cisco DNA Center API, which endpoint should be queried to retrieve the Layer 2 topology for a specific VLAN?

Question 9mediummultiple choice
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A network automation engineer needs to retrieve the Layer 2 topology for a specific VLAN from Cisco DNA Center. Which API endpoint should be used?

Question 10hardmultiple choice
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A network engineer is tasked with segmenting a large broadcast domain into smaller ones using VLANs. In the OSI model, at which layer does a VLAN operate?

Question 11mediummultiple choice
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An engineer is troubleshooting a connectivity issue between two devices on different VLANs. The switch connecting the devices is configured with 802.1Q trunking. At which OSI layer do VLANs operate?

Question 12easymultiple choice
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Refer to the exhibit. A PC is connected to interface GigabitEthernet0/1 on a Cisco switch. The PC is in VLAN 10. What is the purpose of the 'spanning-tree portfast' command on this interface?

Exhibit

Refer to the exhibit.
```
interface GigabitEthernet0/1
 switchport mode access
 switchport access vlan 10
 spanning-tree portfast
```
Question 13mediummulti select
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A network engineer is troubleshooting an issue where hosts in VLAN 100 cannot reach a server at 10.1.1.100. The switch interfaces are configured as access ports in VLAN 100, and the default gateway is 10.1.1.1. The engineer checks the switch and finds that the ARP table does not contain the server's MAC address. Which two actions should the engineer take to resolve the issue? (Choose two.)

Question 14mediumdrag order
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Drag and drop the steps to configure a new 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 15mediummultiple choice
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A junior network developer is tasked with writing a Python script that uses the Cisco NX-API to retrieve the current VLAN configuration from a Nexus switch. The script should output the VLAN IDs in a JSON format. The developer wrote the following code:

import requests
import json

url = "https://192.168.1.1/api/aaaLogin.json" payload = {"aaaUser":{"attributes":{"name":"admin","pwd":"cisco123"}}} r = requests.post(url, json=payload, verify=False) token = r.json()["imdata"][0]["aaaLogin"]["attributes"]["token"]

After authentication, the developer attempts to get VLANs using a GET request to "https://192.168.1.1/api/mo/sys/vlan.json" but receives a 401 error. Which of the following should the developer do to fix the issue?

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