Which line assigns an IP address to the VLAN 20 interface in the sample?

Which line assigns an IP address to the VLAN 20 interface in the sample?

• A. interface vlan 20
• B. ip address 10.10.20.1/24
• C. vlan 20
• D. router ospf 1

Answer: (B)

An SVI needs an IP address to participate in a subnet, so the actual assignment is done with the ip address command inside the VLAN interface context. The line ip address 10.10.20.1/24 sets the IPv4 address and subnet mask for the VLAN 20 interface, placing it in the 10.10.20.0/24 network and enabling routing for that VLAN. The other lines either enter the interface context without assigning an address, create the VLAN, or configure a routing protocol—none of which actually assigns the IP to the VLAN interface.

An SVI needs an IP address to participate in a subnet, so the actual assignment is done with the ip address command inside the VLAN interface context. The line ip address 10.10.20.1/24 sets the IPv4 address and subnet mask for the VLAN 20 interface, placing it in the 10.10.20.0/24 network and enabling routing for that VLAN. The other lines either enter the interface context without assigning an address, create the VLAN, or configure a routing protocol—none of which actually assigns the IP to the VLAN interface.