It all boils down to the interpretation of the word "arrive" in the proposed
question. Does the first bit constitute arrival or the last bit?
If it is the first bit, then they both arrive at the same time or whichever
transmits first. If it is the last bit then of course the 100Mb will win the
prize.
I would say it is a trick question that is referring to the first bit to
signify arrival. I'm pretty sure most everyone knows that a frame will
complete transmission sooner on 100Mb media opposed to 10Mb.
-----Original Message-----
From: Bob Ferguson [mailto:[EMAIL PROTECTED]]
Sent: Friday, October 06, 2000 8:50 AM
To: [EMAIL PROTECTED]
Subject: Re: OT: Ethernet Trivia
Nnanna Obuba wrote:
>
> Let's say we have a 2 lane and a 5 lane road, 2 cars
> travel at the same speed over those roads,and neither
> experiences traffic, which will do 100 miles first?
Not exactly.
You're standing at the city limit sign entering Switchville.
The lead cars of two 512-car motorcades arrive at the same instant on
parallel one-lane roads. Both motorcades are bumper-to-bumper,
traveling
at the same speed.
On motorcade Tenbit, each car is exactly ten times as long as the cars
of motorcade Hundredbit.
Which motorcade will be "in town" (the last car has crossed the city
limit sign) first?
This is due to "serialization delay". With any serial data stream, and
Ethernet is a serial data stream even though it doesn't use a "Serial"
interface, there is a fixed amount of time allocated to each bit of
information. On 10-base-(whatever) Ethernet, it's 100 nanoseconds per
bit (1/10,000,000 second). With 100-base-(whatever), it's 10
nanoseconds
per bit. With T-1, it's 648 nanoseconds per bit.
Even though both frames travel over the wire (or fiber, or microwave) at
the speed of light in whatever medium is used, for the frame to "arrive"
you have to take into account the length of time it takes for the bits
to
clock in, one by one, until the entire frame has arrived.
> --- Frank <[EMAIL PROTECTED]> wrote:
> > Let's say we have a 10Mbps and 100Mbps interface.
> > Both transmit the same
> > sized
> > frame over the same type of media and over the same
> > distance and neither
> > experience
> > a collision. Which will get to the destination
> > first?
--
Jay Hennigan - Network Administration - [EMAIL PROTECTED]
NetLojix Communications, Inc. NASDAQ: NETX - http://www.netlojix.com/
WestNet: Connecting you to the planet. 805 884-6323
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