What Is Hub And Switch In Networking Pdf

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what is hub and switch in networking pdf

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Network devices, or networking hardware, are physical devices that are required for communication and interaction between hardware on a computer network.

A hub is a physical layer networking device which is used to connect multiple devices in a network. They are generally used to connect computers in a LAN. A hub has many ports in it. A computer which intends to be connected to the network is plugged in to one of these ports.

What are Hub and Switch in Computer Network?

Even nowadays, we are not utilizing these hubs for transmission of data because there so many hardware components like a switch, router, and bridges as these replace the hub by providing much more flexibility and security in a network for forming or creating communication. So, let us know some information about the hub which might be useful for future references. Hub is a physical device used in a network that is in a distributed environment like an internet network or wired LAN and basically observed in physical layer. It is solely a hardware component with no participation of software. Hub is indeed different from repeater but the hub is intended as a multiport repeater consisting of one or many ports. Hubs may maintain the ports of count 4, 8, 16, and 24 ports and follow a structure for transmitting the data. The repeater is made up of a 2 port by default so the hub is called multiport.

Ethernet switches link Ethernet devices together by relaying Ethernet frames between the devices connected to the switches. By moving Ethernet frames between the switch ports , a switch links the traffic carried by the individual network connections into a larger Ethernet network. Ethernet switches perform their linking function by bridging Ethernet frames between Ethernet segments. Ethernet bridging was initially defined in the The standardization of bridging operations in switches makes it possible to buy switches from different vendors that will work together when combined in a network design. At that time, Ethernet only supported connections to coaxial cables.

A Hub is a networking device that allows you to connect multiple PCs to a single network. It is used to connect segments of a LAN. A hub stores various ports, so when a packet arrives at one port, it is copied to various other ports. Hub works as a common connection point for devices in a network. Hub In this difference tutorial, you will learn, What is Hub?

What is a network switch, and how does it work?

The key difference between hubs, switches and bridges is that hubs operate at Layer 1 of the OSI model, while bridges and switches work with MAC addresses at Layer 2. Hubs broadcast incoming traffic on all ports, whereas bridges and switches only route traffic towards their addressed destinations. Hubs provide a dedicated physical connection for every device, which helps reduce the possibility that a failure of one computer will cause all computers to lose connectivity. However, because a hub is still a shared bandwidth device, connectivity is limited to half-duplex. Collisions remain an issue as well, so hubs do not help improve the performance of the network. Hubs are essentially multiport repeaters.


Like hubs, switches are the connectivity points of an Ethernet network. Whereas a hub forwards the data it receives to all of the ports on the device, a switch forwards it only to the port that connects to the destination device.


Network Devices Explained

A network switch also called switching hub , bridging hub , and, by the IEEE , MAC bridge [1] is networking hardware that connects devices on a computer network by using packet switching to receive and forward data to the destination device. A network switch is a multiport network bridge that uses MAC addresses to forward data at the data link layer layer 2 of the OSI model. Some switches can also forward data at the network layer layer 3 by additionally incorporating routing functionality. Such switches are commonly known as layer-3 switches or multilayer switches. Switches for Ethernet are the most common form of network switch.

Networks today are essential for supporting businesses, providing communication, delivering entertainment—the list goes on and on. A fundamental element networks have in common is the network switch, which helps connect devices for the purpose of sharing resources. It takes in packets being sent by devices that are connected to its physical ports and sends them out again, but only through the ports that lead to the devices the packets are intended to reach. They can also operate at the network layer--Layer 3 where routing occurs. In general, though, most switches today use ethernet.

Repeater — A repeater operates at the physical layer. Its job is to regenerate the signal over the same network before the signal becomes too weak or corrupted so as to extend the length to which the signal can be transmitted over the same network. An important point to be noted about repeaters is that they do not amplify the signal. When the signal becomes weak, they copy the signal bit by bit and regenerate it at the original strength.

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KEY DIFFERENCES

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