The OSI Model is a conceptual, implementation-neutral model that describes networking in seven separate layers, where each layer covers a set of functions and tasks.
This model helps us communicate while we do network troubleshooting and architecture.
The TCP/IP Model is an implementation-specific networking model that revolves around the TCP protocol and IP addressing which anchor the Internet as we know it.
Its layers include:
The OSI layers include: Physical, Data Link, Network, Transport, Session, Presentation, and Application.
Three broad categories of networks include:
The Internet is technically a WAN.
A network is two or more computers or devices that are linked in order to share information.
Networking refers to a large set of standards and protocols that organize and regulate the sharing of information.
A network protocol is a set of standards for Internet traffic.
Among them are the big transport protocols:
Network Segmentation is the practice of breaking larger networks into smaller, functionally similar networks. This improves both security and performance.
Access points are the systems and nodes used to distribute wireless signals.
If an attacker can physically hack an access point, they may be able to attack the users on the network! This is why you should be careful which access points you connect your devices to.
All wireless activity should be securely encrypted. Currently, the accepted standard for security is WPA2.