difference between switch and router and hub and gateway pdf

Difference between switch and router and hub and gateway pdf

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Switches vs Hubs

Tutorial of Differences between Hub, Bridge, Switch and Router

KEY DIFFERENCES

Network devices, or networking hardware, are physical devices that are required for communication and interaction between hardware on a computer network. Hubs connect multiple computer networking devices together. A hub also acts as a repeater in that it amplifies signals that deteriorate after traveling long distances over connecting cables. A hub is the simplest in the family of network connecting devices because it connects LAN components with identical protocols.

Switches vs Hubs

Login Now. A repeater is a device that operates only in the physical layer. Signals that carry information within a network can travel a fixed distance before attenuation endangers the integrity of the data. A repeater receives a signal and, before it becomes too weak or corrupted, regenerates the original bit pattern. The repeater then sends the refreshed signal. A repeater can extend the physical length of a LAN.

The location of a repeater on a link is vital. A repeater must be placed so that a signal reaches it before any noise changes the meaning of any of its bits.

If the corrupted bit travels much farther, however, accumulated noise can change its meaning completely. At that point, the original voltage is not recoverable, and the error needs to be corrected. A repeater placed on the line before the legibility of the signal becomes lost can still read the signal well enough to determine the intended voltages and replicate them in their original form. A passive hub is just a connector. It connects the wires coming from different branches.

In a star-topology Ethernet LAN, a passive hub is just a point where the signals coming from different stations collide; the hub is the collision point. This type of a hub is part of the media; its location in the Internet model is below the physical layer. An active hub is actually a multipart repeater. It is normally used to create connections between stations in a physical star topology. We have seen examples of hubs in some Ethernet implementations lOBaseT, for example.

However, hubs can also be used to create multiple levels of hierarchy, as shown in Figure. The hierarchical use of hubs removes the length limitation of 10Base-T m.

A bridge operates in the physical layer as well as in the data link layer. It can regenerate the signal that it receives and as a data link layer device, it can check the physical MAC addresses of source and destination contained in the frame.

The major difference between the bridge and the repeater is that the bridge and the repeater is that the bridge has a filtering capability. That means it can check the destination address of a frame and decide if the frame should be forwarded or dropped. If the frame is forwarded, then the bridge should specify the port over which it should be forwarded.

A router is a three-layer device that routes packets based on their logical addresses host-to-host addressing. The routing tables are normally dynamic and are updated using routing protocols. Data is grouped into packets, or blocks of data. Each packet has a physical device address as well as logical network address.

The network address allows routers to calculate the optimal path to a workstation or computer. A gateway is normally a computer that operates in all five layers of the Internet or seven layers of OSI model. A gateway takes an application message, reads it, and interprets it.

This means that it can be used as a connecting device between two internetworks that use different models. For example, a network designed to use the OSI model can be connected to another network using the Internet model. The gateway connecting the two systems can take a frame as it arrives from the first system, move it up to the OSI application layer, and remove the message. We can have a two-layer switch or a three-layer switch.

A three-layer switch is used at the network layer; it is a kind of router. The two-layer switch performs at the physical and data link layers. A two-layer switch is a bridge, a bridge with many ports and a design that allows better faster performance.

A bridge with a few ports can connect a few LANs together. A bridge with many ports may be able to allocate a unique port to each station, with each station on its own independent entity.

This means no competing traffic no collision, as we saw in Ethernet. A two-layer switch, as a bridge does, makes a filtering decision based on the MAC Address of the frame it received. It can have a buffer to hold the frames for processing.

It can have a switching factor that forwards the frames faster. Some new two-layer switches, called cut-through switches, have been designed to forward the frame as soon as they check the MAC addresses in the header of the frame. Find answer to specific questions by searching them here. It's the best way to discover useful content. Download our mobile app and study on-the-go.

You'll get subjects, question papers, their solution, syllabus - All in one app. Login You must be logged in to read the answer. Go ahead and login, it'll take only a minute. Explain in detail repeater, hub, bridges, routers, gateway, switches. Follow via messages Follow via email Do not follow. Please log in to add an answer. Continue reading Find answer to specific questions by searching them here.

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Tutorial of Differences between Hub, Bridge, Switch and Router

Login Now. A repeater is a device that operates only in the physical layer. Signals that carry information within a network can travel a fixed distance before attenuation endangers the integrity of the data. A repeater receives a signal and, before it becomes too weak or corrupted, regenerates the original bit pattern. The repeater then sends the refreshed signal. A repeater can extend the physical length of a LAN. The location of a repeater on a link is vital.

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. It is a 2 port device. A hub connects multiple wires coming from different branches, for example, the connector in star topology which connects different stations.

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 Switch?

KEY DIFFERENCES

Pretty much everyone has heard of the term router, but what does it actually mean? Is your router just a router or can it also be a switch, an access point and a gateway? Back in the days, each term above usually referred to a single device that performed a single function.

In an Ethernet network, there are some networking devices that play their roles at various levels such as hubs, switches and routers. The functions of the three devices are all quite different from one another, even if sometimes they are all integrated into a single device. The following part will focus on the topic—hub vs switch vs router, aiming to clarify differences among them. A hub contains multiple ports.

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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. They ignore the content of an Ethernet frame and simply resend every frame they receive out of every interface on the hub.

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