Which bit in the IPv4 header 'Flags' field represents the MF bit?

The 'Flags' field in the IPv4 header is composed of three bits that control fragmentation and reassembly in IP packets. The third bit in this three-bit sequence specifically serves as the More Fragments (MF) flag.

When the MF bit is set to 1, it indicates that there are more fragments following the current fragment, meaning that this fragment is not the last one. If this bit is set to 0, it signifies that the current fragment is the last fragment of the IP datagram.

Understanding the position of the MF bit within the Flags field is crucial for interpreting whether an IP packet has been fragmented and whether the receiving system should expect additional fragments. The MF bit is specifically the second bit in the sequence of Flags, making its position 1 when counting starts from zero. Hence, the correct choice highlights the significance of the MF flag in managing fragmented IP communications effectively.