[mswindowsxp] Re: Firewall Configuration

  • From: foofaraw in the middle <foofaraw_in_the_middle@xxxxxxxxx>
  • To: mswindowsxp@xxxxxxxxxxxxx
  • Date: Sun, 15 Dec 2002 12:44:33 -0800 (PST)

A router connects different networks together, LANs and WANs. Although hubs and 
switches both glue the PCs in a network together, a switch is more expansive 
and generally considered faster than a hub.  Why? When a hub receives a chunk 
(packet) 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. 
That means the process slows down communication. That's the hub for you, a dumb 
piece of equipment. Not the switch. 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. In 
other words, it is more intelligent than the hub. It is like a multiple bridge 
which is another type of hardware. Routers are like a combination of switches. 
All routers have a Wide Area Network (WAN) Port which connects it to the 
internet and it also has multiple Ethernet ports to connect more than one PC or 
hubs to form a LAN.  These ports allow the PCs to share the WAN port/broadband 
Internet connection and perform LAN functions, such as Windows file and printer 

 Snowshelbi <SnowShelbi@xxxxxxxxxxxx> wrote:
May I ask what is the diff between a switch a router and a hub!?! And
which should be used when 2 computers are sharing one internet

-----Original Message-----
From: mswindowsxp-bounce@xxxxxxxxxxxxx
[mailto:mswindowsxp-bounce@xxxxxxxxxxxxx] On Behalf Of Neil Atwood
Sent: Sunday, December 15, 2002 3:17 PM
To: mswindowsxp@xxxxxxxxxxxxx
Subject: [mswindowsxp] Re: Firewall Configuration

You're quite right Joe - but it was the *purpose* of a hub/switch v a
router that I was querying. ;-)

,,,,, Neil Atwood - natwood@xxxxxxxxxxxxxxxxxx=20
=D4=BF=D4=AC Sydney, Australia=20

Decorate your Christmas with peace


-----Original Message-----
From: mswindowsxp-bounce@xxxxxxxxxxxxx
[mailto:mswindowsxp-bounce@xxxxxxxxxxxxx] On Behalf Of Joe Parker
Sent: Monday, 16 December 2002 7:10 AM
To: mswindowsxp@xxxxxxxxxxxxx

>That's a little puzzling, because routers (in the context we are
>discussing here) are not interchangeable with switches or hubs.=3D20
>Different purpose all together.

True, but these days the line is quickly being blurred by the cheap SOHO

routers that are widely available. They all come with built-in switches.

Owner/Moderator of "My Computer Headaches" 

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