1.What does tcp/ip mean
2.Why is a network layer
3.what is network access

1. Transmission Control Protocol / Internet Protocol

2. In the seven-layer OSI model of computer networking, the network layer is layer 3. The network layer is responsible for packet forwarding including routing through intermediate routers. 

3. Network Access Control is an approach to computer security that attempts to unify endpoint security technology, user or system authentication and network security enforcement. 

ice to water 1 water to vapour 2 latent heat