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is some sort of lan communication technology anyone know some insite to this subject and point me to the right direction thanks
Yes, it is a a LAN communication technology. Specifically, it is Gigabit Ethernet over Multi-mode fiber.
To simplify it further, it is a high-speed local network using optical fiber connections.
Wikipedia has an explanation, but it's quite long. 802.3aq is called "10GBASE-LRM 10 Gbit/s (1,250 MB/s) Ethernet over multimode fiber", perhaps that is what you're after.
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I know in the ethernet header the destination address comes before the source address. Can you please explain me why is that ?
While this kind of questions is often futile (they had to pick one order; which one they choose might be random), there is indeed one very valid reason for this:
In order to work efficiently, the receiver wants to read the address of a packet very easy, perhaps even with the help of hardware (FPGA or ASIC).
And for this, it is handy to have this address at the very beginning.
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I use the following table to workout the required subnet mask for my network of 62 hosts which is 255.255.255.192 which according to the table gives me 4 use-able networks.
In this case the first network address is 192.168.1.64 with a range of 65-126 and broadcast of 127.
second network: 192.168.1.128, range=129-190, broadcast=191.
third network: 192.168.1.192, range=193-254, broadcast=255.
But I don't understand the fourth network. If the table is correct it should start with 192.168.1.256 is this correct? In which case what would the range and broadcast be for this fourth network?
192.168.1.0 with a range of 1-62 and broadcast of .63 is the block you missed.
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I bought a RC Helicopter and I'm just wondering that it's possible to be reprogrammed or not?
If can how to do that? I know this question sounds ridiculous. :)
Thanks for replying
What do you mean reprogrammed?
If you want to make the remote control a light instead of a motor, the answer is yes. If you mean add any intelligence to the toy, the answer is no.
If you are interested in programming, building robots etc, look into microcontrollers. The Arduino is a great one for young enthusiasts.
Some parts of the RC helicopter you can reprogrammed like the ESC, and the main circuit board always can't reprogrammed. Of course, there was exception, for some beta version, most of the board you can reprogrammed in limitted range
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I want know the number max PC, I can set up same LAN with Window7. Thanks How many PC's can theoretically be setup on a Windows 7 Lan, assuming you had an infinite number of switches and cables. I think the answer is 100. But I'm not sure - it might be unlimited. Can any networking experts tell me?
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f33.shtml
more people than you will ever get to know^^
with the subnetmask windows set per default(255.255.255.0) for LANS 255-2=253 Hosts. But you can change that if needed
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I'm using a software (called GeoIP).
It has a lot of database, and performs better than others.
but, not enough for me.
Corretness of this software is 99%, maybe.
I need 100% accuracy.
Please, let me know the perfect program.
PS. It's ok the program is not free.
Short said, it is impossible. You can tell to which company an IP address was originally assigned, but you cannot know what this company does with that IP address. If they give it to a subsidiary abroad, you have lost.