Network Models

Commonly asked questions among aspiring network professionals are what is a network and why is a network important? A network can be defined as having two or more computing devices interconnected while using a set of communication protocols (rules) that enables them to share a resource with each other. Resources can be anything from a file server, network-attached storage (NAS), a network-connected printer, or even a media server with offline copies of your favorite movies and TV shows.

In the world of computer networking, communication between systems is not possible without using a set of guidelines or rules to ensure data is efficiently delivered between a source (sender) and a destination (receiver) host over a network. For instance, imagine you are currently using your smartphone to access the www.cisco.com website to learn more about the CCNA certification, such as the exam objectives. To ensure you are connected to the internet, there are multiple network components...