Exam 200-301 topic 1 question 48 discussion

The component of an Ethernet frame that is used to notify a host that traffic is coming is the preamble. The preamble is a sequence of bits that is transmitted at the beginning of an Ethernet frame and is used to alert the receiving host that a frame is about to be transmitted. The preamble consists of a series of alternating 1s and 0s, followed by a start-of-frame delimiter (SFD). The SFD is a unique pattern of bits that indicates the start of the frame and allows the receiving host to synchronize its clock with the sender's clock. The preamble and SFD together make up the preamble field of the Ethernet frame. After the preamble, the Ethernet frame consists of several other fields, including the destination and source MAC addresses, the type field, and the data field. The data field contains the payload of the frame, which can be a variety of different types of data, such as IP packets or application data. The preamble is important because it allows the receiving host to prepare for the arrival of the frame and ensures that the frame is properly received and processed. Without the preamble, the receiving host may not be aware that a frame is being transmitted, which could result in lost or corrupted data.

Imagine you have a special code that you want to send to your friend using a walkie-talkie. Before you start talking in your code, you want to make sure your friend is listening and ready to hear your message. So, you and your friend decide on a special clapping pattern that you'll do before you start talking. In the same way, in a computer network, before sending important information, devices use a special pattern of signals called a "preamble." This preamble works like the clapping pattern. It helps the devices get ready to listen to the upcoming message and understand it correctly. It's like a little signal that says, "Hey, get ready, some important stuff is about to come!"

C. preamble is correct

C. Preamble The preamble is a sequence of alternating ones and zeros that serves as a synchronization signal at the beginning of an Ethernet frame. It notifies a host that traffic is coming and helps the receiving device synchronize its clock with the sender's clock. This synchronization is essential for correctly interpreting the subsequent data in the frame.

If it says the "actual" traffic is coming the answer would be "A". otherwise is C.

C is correct

For a bit I thought it could possibly be A but the correct answer is C. All the SFD does is let the destination device know the important part of the frame is about to begin. The Preamble is when it actually starts receiving the frame so it known something is about the come.

Ref: Ethernet Frame - an overview | ScienceDirect Topics “… Frame Format … The 64-bit preamble allows the receiver to synchronize with the signal; it is a sequence of alternating 0s and 1s. …” A. start of frame delimiter Wrong answer. B. type field Wrong answer. C. Preamble Correct answer. D. data field Wrong answer

C is correct

The Preamble (7 bytes) and Start Frame Delimiter (SFD), also called the Start of Frame (1 byte), fields are used for synchronization between the sending and receiving devices. These first eight bytes of the frame are used to get the attention of the receiving nodes. Essentially, the first few bytes tell the receivers to get ready to receive a new frame. This is from netacad. Propably the correct answer is C.

C is correct

PREEEEE

PRE (Preamble) indicates the receiver that frame is coming and allow the receiver to lock onto the data stream before the actual frame begins.

PREAMBLE IS THE CORRECT ANSWER 100% ,SORRY FOR CONFUSION

The Preamble is 7 bytes and provides synchronization. The SFD is 1 byte and supposedly lets the user know that data is incoming. That's what I read.

A is correct

According to CISCO preamble is 8 Bytes