What does the line 'interface vlan 20' indicate in the sample configuration?

What does the line 'interface vlan 20' indicate in the sample configuration?

• A. The switch port for VLAN 20
• B. An SVI for VLAN 20
• C. A physical interface
• D. A management VRF

Answer: (B)

This line creates a switch virtual interface (SVI) for VLAN 20. An SVI is a logical, Layer 3 interface tied to that VLAN, which allows the switch to have an IP address for the VLAN and act as the gateway for devices in that VLAN. It enables inter-VLAN routing when IP routing is enabled on the switch. It is not a physical port, so it doesn’t correspond to a specific switch port. It also isn’t a management VRF by itself; VRFs are separate routing contexts, though you can place an SVI in a VRF if needed. In practice, you’d assign an IP address to this SVI to serve as the default gateway for hosts in VLAN 20 and, with routing enabled, route traffic between VLANs.

This line creates a switch virtual interface (SVI) for VLAN 20. An SVI is a logical, Layer 3 interface tied to that VLAN, which allows the switch to have an IP address for the VLAN and act as the gateway for devices in that VLAN. It enables inter-VLAN routing when IP routing is enabled on the switch. It is not a physical port, so it doesn’t correspond to a specific switch port. It also isn’t a management VRF by itself; VRFs are separate routing contexts, though you can place an SVI in a VRF if needed. In practice, you’d assign an IP address to this SVI to serve as the default gateway for hosts in VLAN 20 and, with routing enabled, route traffic between VLANs.