Question

What is the function of a hub? How does it differ from a switch or router? the answer should be at least 250 words

Answer 1

What is hub?

• Hubs are devices used to link several computers together.
• They repeat any signal that comes in on one port and copy it to the other ports (a process that is also called broadcasting).

There are two types of hubs: active and passive.

• • Passive hubs simply connect all ports together electrically and are usually not powered.
  • Active hubs use electronics to amplify and clean up the signal before it is broadcast to the other ports.
• In the category of active hubs, there is also a class called “intelligent” hubs, which are hubs that can be remotely managed on the network.

Router
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• Routers are highly intelligent devices that connect multiple network types and determine the best path for sending data.
• The advantage of using a router over a bridge is that routers can determine the best path that data can take to get to its destination.
• Like bridges, they can segment large networks and can filter out noise. However, they are slower than bridges because they are more intelligent devices; as such, they analyze every packet, causing packet-forwarding delays. Because of this intelligence, they are also more expensive.
• Routers are normally used to connect one LAN to another.
• Typically, when a WAN is set up, there will be at least two routers used.

Switch
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• A network switch is a computer networking device that connects network segments.
• Low-end network switches appear nearly identical to network hubs, but a switch contains more "intelligence" (and a slightly higher price tag) than a network hub.
• Network switches are capable of inspecting data packets as they are received, determining the source and destination device of that packet, and forwarding it appropriately.
• By delivering each message only to the connected device it was intended for, a network switch conserves network bandwidth and offers generally better performance than a hub.
• A vital difference between a hub and a switch is that all the nodes connected to a hub share the bandwidth among themselves, while a device connected to a switch port has the full bandwidth all to itself.
• For example, if 10 nodes are communicating using a hub on a 10-Mbps network, then each node may only get a portion of the 10 Mbps if other nodes on the hub want to communicate as well. .
• But with a switch, each node could possibly communicate at the full 10 Mbps.

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