23 hands-on 802.1Q scenarios you build in your own Cisco Modeling Labs instance and grade against the answer key. Focused 802.1Q configuration and troubleshooting practice for CCNA and CCNP.
Deploy router-on-a-stick inter-VLAN routing across a compact branch topology with a distribution and access switch, a hardened 802.1Q trunk, and two user VLANs. Configure VLANs and access/trunk ports, build router subinterfaces, verify end-to-end user reachability, and troubleshoot trunk/native-VLAN/subinterface mismatches.
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Extend a working two-VLAN router-on-a-stick design to a third VLAN (Guest) without breaking Sales and Engineering. Add one router subinterface, one switch VLAN + access port, and update the switch trunk’s allowed-VLAN list safely using 'add' so existing VLANs remain transported.
Build and verify inter-VLAN routing using router-on-a-stick with a native (untagged) VLAN on the trunk. Configure one router (subinterfaces only), one Layer-2 access switch (VLANs, access ports, and a single 802.1Q trunk), and two end hosts in different VLANs. The management VLAN 99 rides untagged as the trunk's native VLAN, so the router subinterface must use 'encapsulation dot1Q 99 native' and the switch trunk must match 'switchport trunk native vlan 99'. Verify from Linux hosts and IOS 'show' commands, then practice troubleshooting common native-VLAN faults.
Practice creating 802.1Q subinterfaces on a single router uplink to deliver inter-VLAN routing using router-on-a-stick. The Layer-2 switch is already fully configured with VLAN 10 and VLAN 20, access ports for two hosts, and a working 802.1Q trunk to the router. Your job: leave the router's physical Ethernet0/0 unnumbered and add exactly two subinterfaces with the correct encapsulation tags and gateway IPs so hosts can reach their gateways and each other.
Configure the Layer-2 switch side of a router-on-a-stick design. A single IOS router already provides inter-VLAN routing on Ethernet0/0.10 (10.0.10.1/24) and Ethernet0/0.20 (10.0.20.1/24). Bring up VLAN transport by creating VLANs on the switch, assigning host access ports, and converting the router-facing link into an 802.1Q trunk that carries VLANs 10 and 20. Validate with show commands on the switch and with cross-VLAN pings from the hosts.
Design and implement a three-department campus edge using a single router-on-a-stick to provide inter-VLAN routing for Sales (VLAN 10), Engineering (VLAN 20), and Servers (VLAN 30). Map the addressing plan directly to router subinterfaces and build an 802.1Q trunk on the access switch. Verify end-to-end reachability and troubleshoot an allow-list drift scenario.
Build and verify a three-VLAN router-on-a-stick design: one IOS router provides inter-VLAN routing via 802.1Q subinterfaces to a single Layer-2 access switch, with three Alpine hosts in VLANs 10, 20, and 30. The starter environment does not yet forward traffic correctly between all three VLANs, so you will apply a disciplined router-switch-host verification method to diagnose and fix the problem, then briefly break and restore one VLAN's connectivity before finishing with an enterprise-clean, hardened trunk.
Advanced CCNA switching capstone centered on restoring end-to-end VLAN 20 transport across three Layer-2 switches using 802.1Q trunks. The starter ships intentionally broken: after a simulated maintenance window, two Alpine hosts in VLAN 20 can no longer reach each other across the inter-switch trunks. Learners diagnose with show interfaces trunk, show interfaces switchport, and show vlan brief, then identify and correct the trunking faults in the right order and verify with host pings.
Hands-on CCNA lab focusing on 802.1Q trunk allow-lists. Build a realistic three-switch campus with two user hosts in VLAN 10. First bring up trunks carrying all VLANs by default, then implement an explicit allowed VLAN list and prune a non-used VLAN. Intentionally remove VLAN 10 from one trunk to observe an outage, verify with Linux pings and IOS show commands, and restore service by fixing the allow-list. Reinforce native VLAN alignment and compare default vs explicit trunk policy.
Build a single 802.1Q trunk between two Layer-2 switches that correctly carries three VLANs with an explicit allow-list and a dedicated non-default native VLAN. Place hosts in Users (VLAN 10) across both switches and a server in Servers (VLAN 20). Verify that the trunk allows VLANs 10, 20, and 99, that the native VLAN matches on both ends, and that same-VLAN hosts communicate across the trunk. Then intentionally break and restore the configuration to practice troubleshooting trunk allow-lists, native VLAN alignment, and host VLAN placement.
Build a static 802.1Q trunk between two Layer-2 switches to carry VLANs 10 and 20. Map hosts to access ports, verify trunk encapsulation and allowed VLANs, demonstrate same-VLAN reachability across the trunk, and confirm inter-VLAN isolation. Then simulate an allow-list drift fault, diagnose with show commands, and restore service.
Troubleshoot a Layer-2 forwarding fault that breaks a user VLAN between access/distribution switches, then implement static secure MAC binding on the client-facing access port. You will restore end-to-end VLAN 20 reachability and enforce a single authorized MAC on the user port using port-security with violation restrict.
Build an end-to-end 802.1Q path across three Cisco IOS Layer-2 switches so VLAN 10 transports user traffic from an access port on the left switch to an access port on the right switch through a middle switch. Harden trunks (native VLAN 999, nonegotiate) and verify with show interfaces trunk. Then intentionally break the allow-list to see the outage and restore service.
Hands-on CCNA switching lab contrasting single-VLAN access ports with 802.1Q trunks. You begin with the inter-switch link configured as a plain access port, so only one VLAN reaches the router-on-a-stick gateway while the other cannot. You will diagnose the connectivity problem, convert the link into a properly hardened 802.1Q trunk, and validate that both VLANs regain access to their gateway.
An advanced CCNA switching lab focused on verifying 802.1Q trunks and diagnosing a silent VLAN after a switch refresh. The topology uses three layer-2 switches (a distribution switch between two access closets) and two Alpine hosts, and users in VLAN 20 at one closet cannot reach their VLAN 20 peers at the other closet across the trunk path. Learners use show interfaces trunk, show interfaces switchport, and show vlan brief to locate the break and restore predictable Layer-2 forwarding without adding any Layer-3 configuration.
Hands-on DTP negotiation and trunk hardening across a 3-switch path. You will observe dynamic trunking behavior (auto vs desirable), fix an allow-list drift that blocks user VLAN transport, and then harden the trunks to static with nonegotiate and a non-default native VLAN. End-to-end host reachability in the same VLAN proves success.
Diagnose and remediate a trunk misconfiguration between an access switch and a distribution switch so that same-VLAN hosts across two access switches can communicate end-to-end. Use CDP and trunk verification commands to investigate the fault and restore proper trunk operation, without introducing any Layer-3 routing.
Configure a two-switch access layer with data and voice VLANs on access ports and an 802.1Q trunk between switches. Add a router-on-a-stick gateway for VLAN 10/20. Verify VLAN placement, trunk status, and observe a connectivity failure caused by an allow-list misconfiguration on the inter-switch trunk—then correct it to restore intra-VLAN reachability.
Configure VLANs and 802.1Q trunks across two access switches with a router-on-a-stick gateway. Intentionally misconfigure the native VLAN and trunk allow-list to observe loss of intra-VLAN connectivity, detect the mismatch using switch warnings and show commands, and then remediate to restore user reachability. Validates VLAN segmentation, trunking symmetry, and troubleshooting skills for CCNA candidates.
Hands-on CCNA VLAN and trunking lab: assign access ports by interface range, build and harden 802.1Q trunks, set a dedicated native VLAN, correct a misassigned user port, and verify VLAN membership. Includes a cross-switch path with a router-on-a-stick gateway, tests from real hosts, and troubleshooting of trunk allow-lists and native VLAN mismatches.
Configure VLANs and access ports on two Layer-2 switches, build 802.1Q trunks (with hardened native VLAN and an explicit allowed list), validate end-to-end reachability, intentionally prune a VLAN from the inter-switch trunk to observe segmentation, then restore the correct allow-list. Includes realistic router-on-a-stick gateways for VLAN 10/20/99 and switch management on VLAN 99.
Advanced CCNA L2 troubleshooting in a compact branch. Some PCs can't reach their default gateway or other departments across two switches and a router-on-a-stick gateway, and your monitoring system has flagged a switching/trunking problem on the path. Validation is performed from the endpoints (Alpine hosts) using pings and ARP, and trunks are hardened with a non-default native VLAN.
Build and verify an 802.1Q trunk between two access switches that cleanly transports VLAN 10 end-to-end while intentionally pruning VLAN 20. You will configure access ports, create VLANs, set a hardened dot1Q trunk with a non-default native VLAN, and validate host reachability and isolation from endpoints.
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