Exam 200-301 topic 1 question 305 discussion

store and forward: checks the whole frame frament free mode: checks the first 64 byte (no crc) cut through: checks only the destination

As its name shows, store-and-forward switching will wait until the entire frame has arrived before forwarding it. Then the LAN switch will store each complete frame into switch memory buffers and check errors before making a forwarding decision. CRC (cyclic redundancy check) which uses a mathematical formula based on the number of bits (1s) in the frame to check the received frame. But this is not in the official book :(

B is correct

Correct

Store-and-forward switching is a switching technique used in networking where a switch receives an entire frame before it forwards it to its destination. During this process, the switch checks the frame for errors, CRC (Cyclic Redundancy Check) being one of the error-checking mechanisms. If the frame is error-free, the switch will store it temporarily in a buffer and then forward it to the appropriate port. If the frame contains errors, it will be discarded rather than forwarded.

answer is good

https://www.tutorialspoint.com/store-and-forward-packet-switching#:~:text=In%20telecommunications%2C%20store%20%E2%88%92%20and%20%E2%88%92,integrity%20of%20the%20data%20packets.