C.5-Ethernet Header and Trailer fields

Question 1

Preamble

Answer 1

7 bytes of repeating binary 10, so that all devices can synchronized at the physical layer.
Get ready…

Question 2

SFD

Answer 2

Start Frame Delimiter; basically 1 more byte of preamble, but ending with binary 11 instead of 10, to signal that the destination address follows next.
… last byte before addresses!

Question 3

Destination MAC address

Answer 3

The 6- byte address that identifies the Ethernet device to which this frame should be delivered
to there

Question 4

Source MAC address

Answer 4

The 6-byte address that identifies the sending node.

Question 5

Type

Answer 5

A 2-byte code that identifies the tye pf data in the data field; often refers to an IPv4 packet today
the type of data

Question 6

Data

Answer 6

The data from Ethernet’s perspective that includes all headers form upper layers, plus user data
The actual data

Question 7

Pad

Answer 7

Extra bytes used to lengthen short frames so that they meet the minimum frame length requirements
Shortie

Question 8

FCS

Answer 8

Frame Check Sequence. A field used to determine whether any bits changed during transmission. If so, the receiver should discard the frame.