ethernet frame format explanation || Cyber Exploit 2.0

 Ethernet Framing

Preamble:

Synchronize transmission timing 

SFD(Start Frame Delimeter):

Detects the beginning of the data

Destinatio n Addres s (DA):

48 bit value repre s ents the destination MAC Addres s

Source Addres s (S A):

48 bit value repre s ents the destination MAC Addres s

Length or Type:

 Ethernet version 1 use s a Length field

 But the Ethernet version 2 uses a Type Field to identify the Network Layer protoc ol

Data:

 Packet sent to the DLL from the Network Layer

 Size can be 46 to 1500 byte s

Frame Chec k Sequence(FCS):

 Stores the Cyclic Redundanc y Chec k(CRC) ans wer

 Answer should be same in both source and destination

Ethernet at the Data Link layer

Responsible for Hardware Addressing 

Hardware / MAC / Physical Address

 Uniquely identifies each node of a network

 48 bits specified in Hexadecimal format se parate d in six fields

 Locate d on the Network Interfac e Card (NIC)

 Other names - Burned-in- addres s(BIA)

 Examples - 0000.0a12.3456 or 00-00-0a-12-34-56

 First 24 bits - Organizationally Unique Identifier assigned by 

IEEE

 Last 24 bits – Unique Identity for each NIC Card

I hope this information is useful for you. Please forgive any typos or incomplete sentences..