The First Part Of An Ethernet Frame Is Known As The?
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The First Part Of An Ethernet Frame Is Known As The?
Before we discuss the ethernet frame in detail, let us discuss the frame in the network field. Simply, a frame is a data packet or it can be a data unit. Technically, a frame is called a PDU. PDU stands for the protocol data unit that is present at the data link layer of the OSI model. The PDU is named differently at different layers of the OSI model. For example at the transport layer, the PDU is called the TCP segment or it can call as the UDP datagram. Most of the applications use the transmission control protocol. So the segment is often used in order to represent the protocol data unit at the layer. At the network layer, we call PDU a packet or it can be called the IP packet. And at the data link layer, the PDU is called the frame.
We use the different TCP and IP technologies with the different frames in terms of the header information and the MTU(maximum transmission unit) of the data or it can be a payload capability. The ethernet frame is different from the token ring frame and the wifi frame is different from the wi max frame. Each type of frame is different from the other frame. Even among all the ethernet families, the frames act differently. Some of the implementations like gigabit ethernet and the higher speed ethernet use larger frames. This frame is called the jumbo frame.
In order to maintain communication between the two devices, there must be the same type of frames. Now, let us learn about the ethernet structure and frame in detail. The ethernet structure consists of seven parts. They are preamble, recipient mac address, sender mac address, type, data, pad, and the FCS. The first part of the ethernet structure is the preamble.
The preamble is the 64-bit header information that tells the receiving node that a frame is coming and where the frame is get started. The second part is the recipient destination mac address that is followed by the sender mac address. This type of field tells the recipient, the basic type of data such as IPv4 and IPv6. The data field is the payload that is carried by the frame. The payload of the ethernet frame refers to the IP packet that is delivered from the network layer. For the ethernet frame, the payload limit is 1500 bytes. the next field is the pad, the pad is the extra bits to make the frame that is at least bigger than the 64 bytes i.e any data unit which is smaller than the 64 bytes would be considered as the collisions. The receiving device would simply ignore it. The last field in the Ethernet frame is the FCS. FCS stands for frame check sequence, it is mainly used for error checking and for the integrity verification of the frame. The preamble is the first filed in the ethernet frame, it is mainly used to tell if any frame is coming or not.