Final answer:
The QoS mechanism that can fragment large packets and interleave smaller ones is called fragmentation, and the correct answer to the question is option b) Fragmentation.
Step-by-step explanation:
The mechanism that can fragment large packets and interleave smaller packets in amongst the packet fragments is known as fragmentation. Option b) Fragmentation is the correct answer. When a network device, such as a router, encounters a packet that is larger than the maximum transmission size of the network path, it might use fragmentation to break down the packet into smaller, more manageable pieces. This process allows the fragments to be interleaved with smaller packets, which optimizes the transmission by ensuring that the smaller packets are not delayed behind a large packet being transmitted in its entirety.