Interview Questions For Network Engineer in 2025 | VLAN & Native VLAN Issues

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About this Video:
In this session, we’ll dive deep into MAC address table troubleshooting with a real-world VLAN scenario. This video not only helps you understand the native VLAN mismatch issue but also prepares you for scenario-based network engineer interview questions in 2025.

📌 Key Topics Covered:
• How switches learn MAC addresses in VLANs
• Why native VLAN mismatch causes unexpected MAC address learning
• Trunk port behavior with tagged vs untagged traffic
• Real-world troubleshooting steps for VLAN & trunk configuration
• Commonly asked network engineer interview questions from this scenario

Why Watch This Video?
• Learn advanced troubleshooting skills for Cisco switches
• Prepare for Cisco CCNA, CCNP, and real job interviews
• Understand MAC address table behavior in VLAN environments
• See practical demonstrations with trunk links and native VLAN issues

Scenario Explained in this Video:

Switch1 and Switch2 connected via trunk port

PC1 in VLAN 10 (10.1.1.1) and PC2 in VLAN 20 (10.1.1.2)

Both devices are communicating despite being in different VLANs

Why is Switch1 learning MAC of PC2 in VLAN 10?

Why is Switch2 learning MAC of PC1 in VLAN 20?

How does native VLAN configuration affect this behavior?

Your Task:
Pause and think! Can PC1 and PC2 communicate in this scenario without inter-VLAN routing? Share your answers in the comments.

👉 If you are preparing for networking interviews (Cisco, Cloud, or IT roles), these kinds of scenario-based questions are very commonly asked.

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