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Lab 10·Intermediate–Advanced

Trunking and Inter-VLAN Routing

40–50 min15 Questions

Skills Tested

  • Configure trunk ports using 802.1Q
  • Understand VLAN tagging behavior
  • Configure Router-on-a-Stick subinterfaces
  • Identify default gateways per VLAN
  • Analyze inter-VLAN packet flow
  • Troubleshoot VLAN communication issues
  • Understand Layer 3 switch routing with SVIs
Progress0%

A company has implemented VLANs to separate Engineering (VLAN 10) and Sales (VLAN 20).

Users report:

  • !Devices within the same VLAN can communicate normally
  • !Devices in DIFFERENT VLANs cannot communicate at all

Configure trunking and inter-VLAN routing so all departments can communicate through the router.

Network Topology
Router-on-a-Stick
💻PC-AVLAN 10Fa0/3
🖥️PC-BVLAN 20Fa0/5
🔀Switch S1VLAN 10 + 20
G0/1 — 802.1Q Trunk
🌐Router R1G0/0.10: .10.1G0/0.20: .20.1
VLAN 10 – Eng
VLAN 20 – Sales
CLI InputType your command
Q1/15

Configure interface G0/1 on the switch as a trunk port to carry VLAN-tagged traffic to the router.

cli input
Switch(config-if)#
Progress0 correct
Q1Q15

Lessons Reinforced

Lesson 48: 802.1Q TrunkingLesson 49: Inter-VLAN Routing OverviewLesson 50: Router on a StickLesson 51: Layer 3 Switches and SVIs