31-07-2012, 11:08 AM
WAQAS AFTAB
Introduction
Hubs, switches, and routers are all devices which let you connect one or more computers to other computers, networked devices, or to other networks. Each has two or more connectors called ports into which you plug in the cables to make the connection. With the Introduction of broadband Internet connections, these devices have gained popularity .They all perform different tasks, each device plays an important role in networking
Literature review
Hub
A hub is typically the least expensive, least intelligent, and least complicated of the three. Its job is very simple: anything that comes in one port is sent out to the others. That's it. Every computer connected to the hub "sees" everything that every other computer on the hub sees. The hub itself is blissfully ignorant of the data being transmitted.These devices are sometimes referred to as repeaters. A hub sees information in the form of bits. Using a hub is now the cheapest way to connect devices. Hubs work by broadcasting network traffic across all ports. For example, an 8 port hub will broadcast data across all 8 ports even though the data is meant to travel between two devices. For this reason, hubs incur an increased amount of collisions. A collision is simply the results of two devices (computers) trying to broadcast simultaneously. Collisions are a normal part of network traffic.
Switch
A switch does essentially what a hub does but more efficiently. By paying attention to the traffic that comes across it, it can "learn" where particular addresses are. For example, if it sees traffic from device X coming in on port 2, it now knows that device X is connected to that port and that traffic from device X needs to only be sent to that port and not any of the others. The net result of using a switch over a hub is that most of the network traffic only goes where it needs to rather than to every port. On busy networks this can make the network significantly faster. Switches perform the same functionality of hubs, except they only send data to intended ports. Unlike a hub, a switch will not broadcast data across the entire switch. As a result, switches will not suffer from a high rate of collisions
Router
Routers are the smartest of the 3 devices. They make intelligent decisions on how to route traffic. Routing protocols are composed of different algorithms that direct the way routers move traffic.The Internet itself uses complex routers fed by fiber optics to connect cities and countries together. Routers play the most important role in operating a network. They are the most dynamic of all 3 devices. A simple way to think of a router is as a computer that can be programmed to understand, possibly manipulate, and route the data its being asked to handle. For example, broadband routers include the ability to "hide" computers behind a type of firewall which involves slightly modifying the packets of network traffic as they traverse the device. All routers include some kind of user interface for configuring how the router will treat traffic
Gateway
A network gateway is an internetworking system capable of joining together two networks that use different base protocols. A network gateway can be implemented completely in software, completely in hardware, or as a combination of both.
Analysis
Hubs, Switch and Routers are devices that connects one device(computer) to different devices, computers, networks and networked devices.In all of them Hub is the most cheapest, simplest and least intelligent.It connects every device on Hub with all the other devices connected to Hub that means Hub works by broadcasting network traffic across all ports.Switch does what a Hub does but do it more efficiently. Hub is an ignorant of data being transmitted but switch knows what particular addresses are. The main benefit is that the traffic goes only to that port where it needs to be sent rather than to every port.This reduces the chance of collision(two devices trying to broadcast at the same time).However Router makes intelligent decision how to route traffic. Routing protocols are composed of different protocols are composed of different algorithm that helps the router to direct the way in routing traffic.
Introduction
Hubs, switches, and routers are all devices which let you connect one or more computers to other computers, networked devices, or to other networks. Each has two or more connectors called ports into which you plug in the cables to make the connection. With the Introduction of broadband Internet connections, these devices have gained popularity .They all perform different tasks, each device plays an important role in networking
Literature review
Hub
A hub is typically the least expensive, least intelligent, and least complicated of the three. Its job is very simple: anything that comes in one port is sent out to the others. That's it. Every computer connected to the hub "sees" everything that every other computer on the hub sees. The hub itself is blissfully ignorant of the data being transmitted.These devices are sometimes referred to as repeaters. A hub sees information in the form of bits. Using a hub is now the cheapest way to connect devices. Hubs work by broadcasting network traffic across all ports. For example, an 8 port hub will broadcast data across all 8 ports even though the data is meant to travel between two devices. For this reason, hubs incur an increased amount of collisions. A collision is simply the results of two devices (computers) trying to broadcast simultaneously. Collisions are a normal part of network traffic.
Switch
A switch does essentially what a hub does but more efficiently. By paying attention to the traffic that comes across it, it can "learn" where particular addresses are. For example, if it sees traffic from device X coming in on port 2, it now knows that device X is connected to that port and that traffic from device X needs to only be sent to that port and not any of the others. The net result of using a switch over a hub is that most of the network traffic only goes where it needs to rather than to every port. On busy networks this can make the network significantly faster. Switches perform the same functionality of hubs, except they only send data to intended ports. Unlike a hub, a switch will not broadcast data across the entire switch. As a result, switches will not suffer from a high rate of collisions
Router
Routers are the smartest of the 3 devices. They make intelligent decisions on how to route traffic. Routing protocols are composed of different algorithms that direct the way routers move traffic.The Internet itself uses complex routers fed by fiber optics to connect cities and countries together. Routers play the most important role in operating a network. They are the most dynamic of all 3 devices. A simple way to think of a router is as a computer that can be programmed to understand, possibly manipulate, and route the data its being asked to handle. For example, broadband routers include the ability to "hide" computers behind a type of firewall which involves slightly modifying the packets of network traffic as they traverse the device. All routers include some kind of user interface for configuring how the router will treat traffic
Gateway
A network gateway is an internetworking system capable of joining together two networks that use different base protocols. A network gateway can be implemented completely in software, completely in hardware, or as a combination of both.
Analysis
Hubs, Switch and Routers are devices that connects one device(computer) to different devices, computers, networks and networked devices.In all of them Hub is the most cheapest, simplest and least intelligent.It connects every device on Hub with all the other devices connected to Hub that means Hub works by broadcasting network traffic across all ports.Switch does what a Hub does but do it more efficiently. Hub is an ignorant of data being transmitted but switch knows what particular addresses are. The main benefit is that the traffic goes only to that port where it needs to be sent rather than to every port.This reduces the chance of collision(two devices trying to broadcast at the same time).However Router makes intelligent decision how to route traffic. Routing protocols are composed of different protocols are composed of different algorithm that helps the router to direct the way in routing traffic.