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2.0 Switching and Network Access

Inter-VLAN Routing Practice Questions

Router on a stick, SVIs, and routed ports for moving traffic between VLANs.

CCNA v2.0 objective 2.1.d · objective map

Author-reviewed by LabFabric · 7 September 2026 · Report a content issue

One solved question, so you can see how these are marked

Two PCs are connected to the same switch but are in VLAN 10 and VLAN 20. Neither has any other configuration problem. Why can they not communicate?

Each VLAN is a separate broadcast domain, so a Layer 3 device is needed to route between them

A VLAN is a separate broadcast domain and normally a separate IP subnet. Traffic between two VLANs must be routed by a router or a multilayer switch, even when both VLANs live on the same physical switch.

Every question in the set below is marked like this. The answers stay hidden until you pick one.

Find related practice in the CCNA path
All 6 Inter-VLAN Routing questions in this set

Answers and explanations appear when you work through the set above.

  1. Which command set correctly configures a router-on-a-stick subinterface for VLAN 20?

    • interface gi0/0.20 / switchport access vlan 20 / ip address 192.168.20.1 255.255.255.0
    • interface gi0/0.20 / encapsulation dot1q 20 / ip address 192.168.20.1 255.255.255.0
    • interface gi0/0 / vlan 20 / ip address 192.168.20.1 255.255.255.0
    • interface vlan 20 / encapsulation dot1q 20 / ip address 192.168.20.1 255.255.255.0

  2. A router-on-a-stick design intentionally carries one VLAN untagged, matching the switch trunk's native VLAN. Which router subinterface needs the native keyword?

    • The subinterface for the lowest numbered VLAN
    • Every subinterface on the physical interface
    • The subinterface matching the trunk's native VLAN
    • None, the native keyword is only valid on switches

  3. An administratively enabled SVI for an existing VLAN 30 has a correct address but remains down/down. No access port in VLAN 30 is up and no forwarding trunk carries VLAN 30. What explains the state?

    • The SVI needs the no shutdown command as well as an address
    • No active access or trunk port on the switch carries VLAN 30
    • SVIs only come up after the switch has learned a default route
    • The IP address conflicts with another SVI

  4. Which command must be enabled on a multilayer switch before it will route between its SVIs?

    • ip routing
    • ip route-cache
    • switchport routing
    • ip cef enable

  5. What is the main scalability limitation of router-on-a-stick compared with a multilayer switch using SVIs?

    • It supports a maximum of four VLANs in total
    • All inter-VLAN traffic shares the bandwidth of the single trunk link and is routed in software
    • It cannot be used with 802.1Q, only with ISL
    • It requires a separate routing protocol for each VLAN

  6. Which command turns a physical switch port into a routed port that can take an IP address directly?

    • ip routing
    • no switchport
    • switchport mode routed
    • interface routed