Which command creates a VLAN interface named vlan10 with VLAN ID 10 on interface bridge1?

Which command creates a VLAN interface named vlan10 with VLAN ID 10 on interface bridge1?

• A. /interface vlan add name=vlan10 vlan-id=10 interface=bridge1
• B. /interface vlan add name=vlan10 vlan-id=10 interface=bridge2
• C. /interface bridge add name=bridge2
• D. /interface vlan add name=vlan20 vlan-id=20 interface=bridge1

Answer: (A)

Creating a VLAN interface on RouterOS means adding a VLAN sub-interface that tags traffic with a specific VLAN ID on a chosen parent interface. You do this with /interface vlan add and you must specify the name for the new interface, the VLAN ID, and the parent interface. The command that matches the request uses name=vlan10, vlan-id=10, and interface=bridge1, producing a VLAN interface named vlan10 on bridge1 with tag 10. That’s exactly what’s asked: a VLAN interface with ID 10 on bridge1, named vlan10. The other options fail because the second targets a different parent (bridge2) instead of bridge1, so it wouldn’t be on the requested bridge. The third creates a whole bridge rather than a VLAN interface. The fourth creates a VLAN with a different ID and name, not matching the requested 10.

Creating a VLAN interface on RouterOS means adding a VLAN sub-interface that tags traffic with a specific VLAN ID on a chosen parent interface. You do this with /interface vlan add and you must specify the name for the new interface, the VLAN ID, and the parent interface. The command that matches the request uses name=vlan10, vlan-id=10, and interface=bridge1, producing a VLAN interface named vlan10 on bridge1 with tag 10. That’s exactly what’s asked: a VLAN interface with ID 10 on bridge1, named vlan10. The other options fail because the second targets a different parent (bridge2) instead of bridge1, so it wouldn’t be on the requested bridge. The third creates a whole bridge rather than a VLAN interface. The fourth creates a VLAN with a different ID and name, not matching the requested 10.