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The Time to Live (TTL) field in an IP datagram serves an important purpose: it helps prevent datagrams from circulating endlessly on a network. When a datagram is sent from a source to a destination, each router it passes through decreases the TTL value by 1. If the TTL value reaches 0 before the datagram reaches its destination, the datagram is discarded. This mechanism helps eliminate the problem of routing loops, where a datagram might otherwise continue to circulate on the network indefinitely, wasting resources and potentially leading to network congestion.
D. It can be used to prevent packet looping