Draw a flow diagram showing the main functions which are encountered by a typical received TCP/IP packet in the Linux kernel as it passes from the network card to the transport layer, briefly describing each function. Assume that the version of IP in use is v4.

1. List some of the modes of operation of 802.11 (Wi-fi) networks and briefly summarise how the relevant configuration tasks are distributed between userspace and kernel space in Linux.
2. Describe, with the aid of a diagram, how data transmission for 802.11 interfaces is handled in the Linux kernel.
3. Describe, with the aid of a diagram, how data reception from 802.11 interfaces is handled in the Linux kernel. Distinguish between how this occurs in interrupt context and in process context.