What's a protocol? What are the major protocols we've studied and what are the purposes of each? To which layers do they belong? What's a router? What is the relationship between/among protocols? To what extent, and how, do they interact? What are these: the Internet, an internet? What good are networks? What are network topologies? What kinds of cables are there? What is an interface? What about netmasks? Form? Function? Purpose? What is a private IP address? What are headers? What examples of their content are there? What does ARP do? What are traceroute, ping, and ICMP? What is their relationship one to the other? In internetworks, how do hosts and routers communicate? what is the difference in how a host communicates with a local host that is not a router and a local host that is a router? What about the IP protocol's checksum feature?