what is the difference between hub and switch?

Answer 1

Hub is a place of convergence where data arrives from one or more directions and is forwarded out in one or more other directions

A hub is a network device that is used for connecting computers on a Local Are Network (LAN). It forwards all the packets it receives to all of its ports


network switch is a computer networking device that connects network segments. It uses the logic of a Network bridge but allows a physical and logical star topology. It is often used to replace network hubs. A switch is also often referred to as an intelligent hub.

Answer 2

I disagree with brian10g.A switch is a multiport bridge.A hub is a multiport repeater.In both of them you can plug many cables.A hub (where you can plug many cables) works like the repeater (where you can plug only one bable from one host and one from an other) becouse it only regenerates the signal.Also the hub sents information to all its ports except from the port from which the information was sent.On the otherhan the switch (where you can plug many cables) wich works like a bridge regenerates the signal and also sents the information only to the port where is the destination(by using its mac adress table).For this reason the swtch can reduce the collision.Also the switch supports full duplex and by this way there is no chance for collissions.I agree that the switch is much more better than hub and even if you want to you can't buy a hub now becouse none uses it any more!

Answer 3

A hub is an unintelligent ("dumb") device - it does not make decisions, it is essentially only an extension of the wire.

A switch has the intelligence to make decisions based on the MAC address. It "learns" which MAC addresses are reachable through each port, then forwards traffic that is intended for those addresses to the port that can reach them. In this way it reduces the unneeded network traffic on each segment, and reduces the possiblity of "collisions" on each segment. These days a lot of network cards are capable of full-duplex (ie, both sending and receiving data at the same time). This is only really possible on a dedicated network segment - switches provide these dedicated segments, so the theoretical bandwidth is twice what it used to be. In other words, on a 100Mbps link, theoretically we could have 200Mbps throughput.

Answer 4

A hub, or repeater, is a fairly unsophisticated broadcast device. Any packet entering any port is broadcast out on every port and thus hubs do not manage any of the traffic that comes through their ports. Since every packet is constantly being sent out through every port, this results in packet collisions, which greatly impedes the smooth flow of traffic.

A switch isolates ports, meaning that every received packet is sent out only to the port on which the target may be found (assuming the proper port can be found; if it is not, then the switch will broadcast the packet to all ports). Since the switch intelligently sends packets only where they need to go the performance of the network can be greatly increased.

Answer 5

A hub is something that allows you to plug many things into one port. For example, a 4-port USB hub would mean you can plug 4 USB devices into the hub which only uses 1 port on your computer (you can use them all at the same time).

A switch means you can only use one at once and you select which one is being used.

Answer 6

Hubs do no processing on network traffic--they simply repeat the incoming signal to all available ports. On a switch, every port acts as a bridge. If each switch port is connected to a single device, each device can, in principle, act independently of every other device.

Answer 7

a hub is stupid... it simply wires everything together and sits there like a lazy bum not doing anything... packets that are supposed to go to a specific computer are sent to all computers connected to the hub, whether it wants it or not. The computer will reject the packet so everything works fine, but sometimes it can be slower because you have things going where they shouldn't clogging up the network.

on the other hand, a switch is smart... if you send a packet to a computer it knows what computer that is and sends it to that computer, not to every single one

Answer 8

Both switch and hub doing the same job, delivering data from one point to another point.
The difference is:
1. HUB is called as dumb switch, which mean, says, you have a hub with 8 ports there, all 8 pcs connected to that single hub. When one pc that connected to that hub want to send data to another PC that also connected to that HUB, actually HUB sends that data to all ports, mean that another 7 pcs that connected to that ports received the same data which they dont actually intend to received that. Another 6 pcs will discard the data that they dont intend to receive, so only 1 pc that intend to received accept the data. This habbit makes HUB work so slow in peak time.
2. Switch, vice versa from HUB, know exactly which ports is the sender want to send, so SWITCH only send the data to that particular ports. Thats why SWITCH called as intelegent, meanwhile hub is dumb.

^_^ cheers.

Answer 9

Hey Buddy,

Technology cant be pened in few lines..soo let me breif u simple and easy.

Just follow me:

Although hubs and switches both glue the PCs in a network together, a switch is more expensive and a network built with switches is generally considered faster than one built with hubs. Why?

When a hub receives a packet (chunk) of data (a frame in Ethernet lingo) at one of its ports from a PC on the network, it transmits (repeats) the packet to all of its ports and, thus, to all of the other PCs on the network. If two or more PCs on the network try to send packets at the same time a collision is said to occur. When that happens all of the PCs have to go though a routine to resolve the conflict. The process is prescribed in the Ethernet Carrier Sense Multiple Access with Collision Detection (CSMA/CD) protocol. Each Ethernet Adapter has both a receiver and a transmitter. If the adapters didn't have to listen with their receivers for collisions they would be able to send data at the same time they are receiving it (full duplex). Because they have to operate at half duplex (data flows one way at a time) and a hub retransmits data from one PC to all of the PCs, the maximum bandwidth is 100 Mhz and that bandwidth is shared by all of the PC's connected to the hub. The result is when a person using a computer on a hub downloads a large file or group of files from another computer the network becomes congested. In a 10 Mhz 10Base-T network the affect is to slow the network to nearly a crawl. The affect on a small, 100 Mbps (million bits per scond), 5-port network is not as significant.

Two computers can be connected directly together in an Ethernet with a crossover cable. A crossover cable doesn't have a collision problem. It hardwires the Ethernet transmitter on one computer to the receiver on the other. Most 100BASE-TX Ethernet Adapters can detect when listening for collisions is not required with a process known as auto-negotiation and will operate in a full duplex mode when it is permitted. The result is a crossover cable doesn't have delays caused by collisions, data can be sent in both directions simultaneously, the maximum available bandwidth is 200 Mbps, 100 Mbps each way, and there are no other PC's with which the bandwidth must be shared.

An Ethernet switch automatically divides the network into multiple segments, acts as a high-speed, selective bridge between the segments, and supports simultaneous connections of multiple pairs of computers which don't compete with other pairs of computers for network bandwidth. It accomplishes this by maintaining a table of each destination address and its port. When the switch receives a packet, it reads the destination address from the header information in the packet, establishes a temporary connection between the source and destination ports, sends the packet on its way, and then terminates the connection.

Picture a switch as making multiple temporary crossover cable connections between pairs of computers (the cables are actually straight-thru cables; the crossover function is done inside the switch). High-speed electronics in the switch automatically connect the end of one cable (source port) from a sending computer to the end of another cable (destination port) going to the receiving computer on a per packet basis. Multiple connections like this can occur simultaneously. It's as simple as that. And like a crossover cable between two PCs, PC's on an Ethernet switch do not share the transmission media, do not experience collisions or have to listen for them, can operate in a full-duplex mode, have bandwidth as high as 200 Mbps, 100 Mbps each way, and do not share this bandwidth with other PCs on the switch. In short, a switch is "more better."

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Bye

Answer 10

The hub works with the speed of 10 mbps and switch works with
10\100 mbps it means it will support 10 mbps to 100 mbps