For Nic's I would of went into more detail about the different types of cards and the different slots Isa/Pci and would include information about ethernet cable standards

10base2 is 1 Mbps thin coaxial cable
10base5 is 10 Mbps thick coaxial network cable
10 baseT 10 Mbps unshielded twisted pair
100 baseT 100 Mbps shielded twisted pair
100BaseF 100 Mbps fiberoptic network cable
1000BaseT 1Gbps Copper cable
1000BaseF 1Gbps fiberoptic cable
And more information about the OSI layers would be very helpful for those people who are new to networking. I would also include the definitions of the acronyms used such as ARP(address resolution protocol) SAP (Service Advertising Protocol).