The simple answer is that they are bigger-than-normal Ethernet frames. If that doesnt mean anything to you, a normal Ethernet frame (layer 2) has 42-1500 bytes of payload. On top of that is about 22 bytes of overhead, which means 1.4 to up to 34 percent of the frame is overhead only. By definition, a jumbo frame has more than 1500 bytes of payload. Because of that, there is some flux in how large that frame is, but 1600-9000 bytes of payload is typical. The overhead (still 22 bytes) is between 0.2 and 1.3 percent and is significantly less. Past that, there is a super jumbo frame, which you guessed it is over 9000 bytes (generally up to 64000 bytes)

The overhead for a jumbo frame is _____.

a 22 bytes no matter how large the payload

b about 30% of the average network payload

c dependent on the size of the payload

d dependent on the amount of NIC offloading