Waterz Engineering

10/09/2026

17/08/2026

Router-on-a-Stick — Inter-VLAN Routing with One Physical Link!

Need devices in different VLANs to communicate without using a Layer 3 switch? Router-on-a-Stick is a classic CCNA solution.

It uses one router interface divided into multiple subinterfaces, while an 802.1Q trunk link carries traffic for multiple VLANs between the switch and router.

In this example:

🔹 VLAN 10 — Sales
🔹 VLAN 20 — IT
🔹 Each VLAN has its own default gateway
🔹 The switch-to-router link operates as a trunk
🔹 The router performs routing between VLANs

💡 CCNA Challenge

Which command assigns VLAN 10 tagging to a router subinterface?

A) "switchport access vlan 10"
B) "encapsulation dot1Q 10"
C) "switchport mode trunk"
D) "ip route vlan 10"

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17/08/2026

Configure Trunking — Carry Multiple VLANs Between Switches!

A trunk link is essential when multiple VLANs need to travel between switches over a single physical connection.

In this lab, VLAN 10, VLAN 20, and VLAN 30 are carried between two Cisco switches using 802.1Q trunking.

🔹 Configure the switch port as a trunk
🔹 Allow only the required VLANs
🔹 Verify trunk status and VLANs
🔹 Keep the native VLAN secure
🔹 Save the configuration properly

💡 CCNA Challenge

Which command verifies active trunk links on a Cisco switch?

A) "show vlan brief"
B) "show interfaces trunk"
C) "show ip route"
D) "show mac address-table"

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