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Topic: Inter-VLAN RoutingSwitch
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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 and requires Layer 3 routing

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.

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All 11 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, native is a switch keyword

  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 single trunk link and the router's forwarding capacity
    • It cannot be used with 802.1Q, only with ISL
    • It requires a separate routing protocol process for every VLAN, even when all subnets are directly connected

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

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

  7. A trunk permits VLANs 10 and 20, but its native VLAN is 99. How is a frame from VLAN 20 carried?

    • As an Ethernet broadcast
    • With an 802.1Q VLAN 20 tag
    • Untagged because VLAN 20 is allowed
    • With VLAN 99 in the IP header

  8. A router subinterface uses encapsulation dot1q 20, but the switch trunk allows only VLANs 10 and 30. What blocks VLAN 20 traffic?

    • The VLAN 20 IP subnet must equal VLAN 10
    • The native VLAN must be 20
    • The trunk excludes VLAN 20
    • The router needs a second physical interface

  9. A VLAN 20 host can ping its local gateway, but its route table has no route to VLAN 10 or default route. Which endpoint setting is missing?

    • The VLAN 10 switch hostname and domain
    • The trunk native VLAN
    • The router console speed
    • The VLAN 20 host default gateway

  10. A Layer 2 switch has a management SVI in VLAN 10 and must send management traffic to another subnet. Which global setting supplies its next hop when IP routing is disabled?

    • ip default-gateway and the router IP
    • encapsulation dot1q 10 on the SVI
    • switchport mode trunk on the SVI
    • spanning-tree portfast on the SVI

  11. A PC intended for VLAN 20 receives a VLAN 10 address from DHCP. The switch uplink carries both VLANs correctly. What should be checked on the PC-facing port?

    • The router hostname
    • Its access VLAN assignment
    • The VLAN 10 DHCP lease duration
    • The trunk native VLAN only