Implementing Cisco IP Switched Networks (SWITCH v2-0) (#101)

Which two statements about 802.1q are true? (Choose two.)

It encapsulates the original Ethernet frame and adds a VLAN identifier.
It increases the maximum size an Ethernet frame to 1594 bytes.
It is a Cisco proprietary protocol.
When It is enabled, it forces a recalculation of the frame check sequence field.
It supports 8-byte VLAN identifiers.
It adds a 32-bit field to the Ethernet frame between the source MAC address and length fields.