Solved

What's the difference between a switch and a hub?

Posted on 2006-07-06
10
1,640 Views
Last Modified: 2008-01-09
What's the difference between a switch and a hub?

And how do you know which one is best to use for a paticular network?
0
Comment
Question by:Axter
  • 2
  • 2
  • 2
  • +4
10 Comments
 
LVL 2

Assisted Solution

by:chris_bol
chris_bol earned 100 total points
ID: 17051321
0
 
LVL 9

Accepted Solution

by:
jjoseph_x earned 150 total points
ID: 17051351
You should always use a switch instead of a hub unless you need for the data to be replicated out every port (e.g.: you want be to able to sniff the traffic of all connected stations).  Even then, a decent, managed switch will allow you to replicata the traffic from one port to another.
0
 
LVL 1

Assisted Solution

by:xmaveric
xmaveric earned 100 total points
ID: 17051395
When you send data to a hub, the hub forwards it to all attached computers.

When you send data to a switch, it only forwards the data to the specific computer the data is meant for.


Now that switches are as cheap as hubs, most people use switches because they provide a faster, more reliable network.
0
 
LVL 13

Assisted Solution

by:prashsax
prashsax earned 150 total points
ID: 17051600
The basic difference between HUB and switch is like this:

On a HUB when a machine send a packets, this packet is send to all machines connected to this HUB irrrespective of the IP address of MAC address of destination machine.
So anyone connected to this HUB can listen any conversation happening on any of the machines on this HUB.

On a switch, when a machine send out a packet, the switch looks at the destination MAC address and send the packet to only that port where the destination machine is connected. So here even if many machines are connected to a switch only the destination machine will receive the packet and not all machines.

Now, generally you should use Switch in a network as it is safer then HUB and provides more speed.(Less packet collisions).

But in some cases you can use HUB. Like if you want to monitor all the traffic going and coming to your internet connection. So here you can plug a HUB between your internet router and network. Now connect a machine to this hub and  you can look at all the traffic passing thru the HUB.
0
 
LVL 30

Author Comment

by:Axter
ID: 17051845
How about if you're using old style video games like Duke Nukem on a multiplayer game, where the packets are being sent to multiple machines.  Would a HUB then be faster then a switch?
0
Control application downtime with dependency maps

Visualize the interdependencies between application components better with Applications Manager's automated application discovery and dependency mapping feature. Resolve performance issues faster by quickly isolating problematic components.

 
LVL 13

Assisted Solution

by:prashsax
prashsax earned 150 total points
ID: 17052215
No, HUB will not be faster then switch.

One thing you need to consider is that even if HUB is sending a single packet to all ports but other machines connected to it will discard the packet (in normal mode). Because the destination IP address on that packet differs from that they have assigned to them. Only one machine which has same IP address as mentioned in the packet will repond to it.

So, switch is still faster.

0
 
LVL 4

Expert Comment

by:xcromx
ID: 17052963
Switches have a different interfaces then hubs
meaning each port on a switch has its own mac address
hub only has one mac address..

Use the switch in all your networking needs..faster and more reliable
0
 
LVL 17

Expert Comment

by:Jared Luker
ID: 17054143
If you want to watch the traffic on your network than a hub is not your answer.  I agree that you should ALWAYS use a switch.

You can use sniffing programs such as SNORT if you want to sniff the traffic on your network.
0
 
LVL 9

Assisted Solution

by:jjoseph_x
jjoseph_x earned 150 total points
ID: 17054505
Actually hubs are stricly layer 1 devices, so they don't have MAC addresses.  Actually, neither do switch ports... they just receive and transmit the bits, they don't require MAC addresses either (though managed switches do have MACs on some of their ports).

Also, you can't use a sniffing program very effectively with a switch unless you're able to mirror ALL of the data to one port.  If your machine is connected to a switch, it will only receive traffic destined to its MAC address (so even if your NIC is in promiscuous mode, it will only get data that's destined to your machine)... that's fine if you want to sniffer traffic between your machine and another workstation, but it won't like you sniff traffic for the entire network.

0
 
LVL 30

Author Comment

by:Axter
ID: 17055830
Thank you all
0

Featured Post

Highfive Gives IT Their Time Back

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

This tutorial will go through the steps required to write a script that will back up the configuration settings of a HP-ProCurve switch. You will need to get the following things to follow this tutorial: Telnet Scripting Tool e.g. TST10.exe …
PRTG Network Monitor lets you monitor your bandwidth usage, so you know who is using up your bandwidth, and what they're using it for.
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

705 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now