Which two statements about 802.1Q are true? (Choose two)
A. It encapsulates the original Ethernet frame and adds a VLAN identifier.
B. It increases the maximum size an Ethernet frame to 1094 bytes.
C. It is a Cisco proprietary protocol.
D. When It is enabled, it forces a recalculation of the frame check sequence field.
E. It supports 8-byte VLAN identifiers.
F. It adds a 32-bit field to the Ethernet frame between the source MAC address and length fields.
FFS so many wrong answers on this site.. it’s B and D, even though there’s also a typo in the B answer, it’s 1594.
https://www.cisco.com/c/en/us/support/docs/lan-switching/8021q/17056-741-4.html
if core bus is q tagged, then FCS recalculation takes places on ingres when Q is disabled.
anybody knows how it is FCS on the core bus of a cisco device?
D, F frame is 4 bytes more so FCS must be recalculated. Max frame size increases to 1522
https://en.wikipedia.org/wiki/IEEE_802.1Q
indeed D and F. Thera are a lot of errors ont this site..