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How does Ethernet handle error detection?
Each Ethernet frame contains a trailer with a cyclic redundancy check (CRC) of the frame contents. After reception of a frame, the receiving node creates a CRC from the bits in the frame to compare to the CRC value in the frame trailer. If these two CRC calculations match, the frame can be trusted as being received without error. The trusted frame will then be processed. A frame received with bad, nonmatching CRC's will be discarded.
If a node receives a frame and the calculated crc does not mach the crc in the fcs what action will the nod take?
It will drop the frame
Select the one that best describes the contents of a typical network frame?
senders MAC address, recipients MAC address, data, CRC RECIPIENTS MAC ADDRESS, SENDERS MAC ADDRESS, DATA,CRC RECIPIENTS IP ADDRESS, SENDERS IP ADDRESS, DATA, CRC RECIPIENTS EMAIL ADDRESS, SENDERS EMAIL ADDRESS,DATA,CRC
What algorithm is used for the Frame check sequence?
The Frame Check Sequence (FCS) typically employs the Cyclic Redundancy Check (CRC) algorithm to detect errors in digital data. CRC uses polynomial division to generate a short, fixed-length binary sequence based on the data being transmitted. The sender calculates the CRC value, appends it to the frame, and the receiver performs the same calculation to check for discrepancies, ensuring data integrity. Common CRC standards include CRC-32 and CRC-16.
Explain the store and forward method of switching give the advantage and disadvantage of this message switching technique what is packet switching?
In this type of switching, the entire frame is read and stored in memory before being sent to the destination device. The switch checks the integrity of the bits in the frame by recalculating the cyclic redundancy check (CRC) value. If the calculated CRC value is the same as the CRC field value in the frame, the switch forwards the frame out the destination port. The switch does not forward frames if the CRC values do not match. The CRC value is located within the frame check sequence (FCS) field of an Ethernet frame. Although this method keeps damaged frames from being switched to other network segments, it introduces the highest amount of latency. Due to the latency incurred by the store and forward method, it is typically only used in environments where errors are likely to occur, such as environments that have a high probability of EMI.
Error detection at data link layer is achieved by?
Error detection at data link level is achieved by using a Frame Check Sequence (FCS) method like Parity, Checksum Calculation or Cyclic Redundancy Check (CRC).
Data link protocols almost always put the CRC in a trailer rather than in a header Why?
Oh, dude, it's like putting the cherry on top of a sundae, you know? The CRC in the trailer is like the dessert at the end of a meal - it's there to make sure everything that came before it is legit. Plus, if you put it in the header, it's like trying to eat your dessert before your main course - just doesn't make sense, man. So, they stick it in the trailer to keep things in order and make sure all the data is good to go.
What Ethernet(II) frame field is used for error detection?
The Ethernet (II) frame uses the Frame Check Sequence (FCS) field for error detection. This field is a 4-byte cyclic redundancy check (CRC) value that is calculated based on the frame's contents before transmission. When the frame is received, the receiving device calculates the CRC again and compares it to the FCS value; if they do not match, an error is detected, indicating that the frame may have been corrupted during transmission.
What LAN switch mode keeps CRC errors to a minimum but still has a fixed latency rate?
The LAN switch mode that keeps CRC errors to a minimum while maintaining a fixed latency rate is "Store and Forward" mode. In this mode, the switch receives the entire frame, checks it for errors (including CRC), and only forwards error-free frames. This helps reduce the chances of undetected errors propagating through the network, ensuring higher data integrity while providing consistent latency.
How many bits EthernetCRC computation uses?
Ethernet CRC computation uses 32 bits. Specifically, it employs a cyclic redundancy check (CRC) with a polynomial of degree 32, which helps in detecting errors in transmitted frames. This 32-bit CRC is appended to the Ethernet frame, ensuring data integrity during transmission.
What are the redundant bits used in CRC are called?
The redundant bits used in Cyclic Redundancy Check (CRC) are called "check bits" or "CRC bits." These bits are appended to the original data to create a larger data frame, which helps in detecting errors during transmission. The CRC algorithm generates these bits based on the polynomial division of the data, ensuring that any changes to the data can be identified by checking the resulting remainder.
What is the Protocol data unit at the network layer?
frame
