Which command causes a Layer 2 switch interface to operate as a Layer 3 interface?

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Which command causes a Layer 2 switch interface to operate as a Layer 3 interface?
A . no switchport nonnegotiate
B . switchport
C . no switchport mode dynamic auto
D . no switchport

Answer: D

Explanation:

The no switchport command makes the interface Layer 3 capable.

Source: http://www.cisco.com/c/en/us/support/docs/lan-switching/inter-vlan-routing/41860-howtoL3- intervlanrouting.html