Introduction In this modernized world, Internet and network are very vital and important not only for individuals but also for businesses, organizations, institutions, etc. For this reason, it is very important to make use of as many network devices as available. We need to study more or at least take a look at information about network devices before choosing them or starting to use them. There are many networking devices that we can study, but the devices chosen for this report are hub, switch, router, and repeater.HubWhen it comes to networking, a hub is a simple device that joins more than one computer into one central connection points via LAN. Individual network segments are formed by joining multiple computers or other network devices connected via a hub. Hubs are used for twisted-pair cabling when used on the network. The hub essentially receives the incoming packets that have been sent and transmits all these packets to all the devices connected to the network under the hub device. Ethernet hub, active hub, network hub, repeater hub, and multiport hub are an example of a hub. The hubs used on the LAN are in the star topology. This is because when a device in the hub is disconnected it is still connected. This is why hubs are classified in star topology. An Ethernet hub is also called a multiport repeater. It is used to boost the signal as it passes through it and to prevent attenuation effects. Ethernet hubs vary in the bandwidth they support. The number of ports supported by an Ethernet hub can also vary. Ethernet hubs commonly used in home networks are four- and five-port Ethernet hubs. Newer Ethernet hub devices are much smaller than older devices.......half the paper...... This device allows data speeds of up to 100 Mbps. It also has an IP67 rating for external conditions. Network repeaters are used to boost the incoming wireless signal or electrical signal. By using the repeater in conjunction with physical media such as Ethernet cable or Wi-Fi, the amplified data transmission will only cover a limited distance before the signal begins to degrade. All the devices studied above each play a unique role in network works that have profoundly affected our daily lives. For example, without a hub it is really impossible for more than one computer to connect to a line. It is really difficult to implement long distance connections without a repeater to support and amplify the signal. Without switches it is impossible to switch from one port to another. Without routers it is difficult to divide a large network into separate parts, thus saving costs and money.