What is Hub?

The hub at the center of this network is a very simple piece of networking hardware that takes the data from one computer in the network and passes them on to the other computers in the network.
What is LAN?

A LAN is a communications network consisting of cables, computers, and network devices confined to a very small geographic region such as a single building, or floor of a building.
What is Packets?

When sending a message over a network (e.g., an email), the message is usually broken up into a smaller set of messages called packets.
What is Bandwidth?

When talking about computer networks, bandwidth refers to the capacity of a network. Bandwidth is often measured in kilobits per second (Kbps), megabits per second (Mbps), or gigabits per second (Gbps). The terms broadband, narrowband, and midband are often used to describe the bandwidth. These are not precisely defined, except in an ordinal sense, and the actual bandwidth associated with these terms is changing rapidly over time as network capacity increases. We will define broadband as at least 10 Mbps, midband as 1–10 Mbps, and narrowband as less than 1 Mbps.
What is Router?

 A router is a network device used to send or route packets from one LAN to another LAN. The LANs may be connected by dedicated leased phone lines, fiber optic cable, or through various wireless technologies.

An example of LAN

An example of WAN

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