Which line defines the SVI for VLAN 20 in the sample?

Which line defines the SVI for VLAN 20 in the sample?

• A. interface vlan 20
• B. ip address 10.10.20.1/24
• C. vlan 20
• D. interface vlan 30

Answer: (A)

An SVI is the Layer 3 interface that represents a VLAN on a routing-capable switch. You define that virtual interface with the command for that specific VLAN, which in this case is interface vlan 20. This line creates the SVI for VLAN 20 so you can assign an IP address on it and route for that VLAN. The IP address command would configure the address on that SVI but does not create it; configuring just a VLAN without an SVI doesn’t establish a routable interface, and pointing to a different VLAN’s SVI would configure something else entirely. So the line that defines the SVI for VLAN 20 is the one that specifies interface vlan 20.

An SVI is the Layer 3 interface that represents a VLAN on a routing-capable switch. You define that virtual interface with the command for that specific VLAN, which in this case is interface vlan 20. This line creates the SVI for VLAN 20 so you can assign an IP address on it and route for that VLAN. The IP address command would configure the address on that SVI but does not create it; configuring just a VLAN without an SVI doesn’t establish a routable interface, and pointing to a different VLAN’s SVI would configure something else entirely. So the line that defines the SVI for VLAN 20 is the one that specifies interface vlan 20.