This is for my Technologies Infrastructure and Architecture class. Why do you th

Question

This is for my Technologies Infrastructure and Architecture class.

Why do you think the store-and-forward packet switching method might be more common in routers than continuous transmission? Suppose there is exactly one packet switch between a sender and receiver. The transmission rates between the sender and the switch and between the switch and receiver are R_1 and R_2 respectively. Assuming the switch uses store-and-forward packet switching, what is the total end-to-end delay to send a packet of length L (ignoring queueing, propagation, and processing delays)?

Explanation / Answer

5)Answer:

store and forward packet switching method might be more common in routers because Store-and-Forward switchingwill wait until the entire frame has arrived prior to forwardingit. This method stores the entire frame in memory. Once the frameis in memory, the switch checks the destination address, sourceaddress, and the CRC. If no errors are present, the frame isforwarded to the appropriate port. This process ensures that thedestination network is not affected by corrupted or truncatedframes.

All PSDNs, WANs and FR operate in “store and forward” mode:

Packet stored at a node and transmitted to next node. - Next node receives it completely in a buffer. - Routing decision selects outgoing link to “forward” it toward its final destination. - Steps above repeated until packet fully received at destination node. • FR node involves much less processing per frame than PSDN node but still operates in store and forward mode

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