In which scenario would the 'Fragment Offset' field be used?

The 'Fragment Offset' field is used to identify the position of a fragment within an original packet when that packet is fragmented during transmission. Fragmentation occurs when a packet is too large to be transmitted over a network with a smaller maximum transmission unit (MTU).

When a packet is fragmented, each fragment must contain information that helps reassemble the packet back to its original form at the destination. The Fragment Offset provides the necessary details about where a particular fragment fits in relation to the entire packet. It specifies the distance (in 8-byte blocks) of the fragment's data from the beginning of the original unfragmented packet. This crucial information allows the recipient to correctly order and combine all fragments to recreate the complete data packet accurately.

In contrast, other options such as specifying packet urgency, indicating precedence, or marking the end of transmission do not involve the Fragment Offset. These functions are handled by different fields or protocols within the packet header and serve different purposes in network communication.